Very Important Example of Hibernate3.0

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First Application Of Hibernate

It is a first application which persist data into database:

Step 1:-

first we create a hibernate.cfg.xml file:

Hibernate uses the hibernate.cfg.xml to create the connection pool and setup required environment.// hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory><property name="dialect">org.hibernate.dialect.MySQLDialect</property><property name="connection.url">jdbc:mysql://localhost:3306/test</property><property name="connection.username">root</property><property name="connection.password">root</property><property name="connection.driver_class">com.mysql.jdbc.Driver</property><mapping resource="Emp.hbm.xml"/></session-factory>

</hibernate-configuration>

Step 2:-

write first java persistance class.

// Emp.java

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package r4r;

public class Emp {int id;String name,job;int salary;

public Emp() { super(); }public Emp(String name, String job, int salary) { super(); this.name = name; this.job = job; this.salary = salary;}public int getId() { return id;}public void setId(int id) { this.id = id;}public String getName() { return name;}public void setName(String name) { this.name = name;}public String getJob() { return job;}public void setJob(String job) { this.job = job;}public int getSalary() { return salary;}public void setSalary(int salary) { this.salary = salary;}

}

Step:3 -

// Mapping the Emp Object to the Database Emp table

The file Emp.hbm.xml is used to map Emp Object to the Emp table in the database. Here is the code for Emp.hbm.xml:

<?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping><class name="r4r.Emp" ><id name="id" type="int"><generator class="increment" /></id><property name="name" /><property name="job" /><property name="salary" type="int"/></class> </hibernate-mapping>

Step 4:-

//

SessionProvider is created for creating the object of session. //sessionProvider.java package r4r;

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;

public class SessionProvider {static SessionFactory factory;static{Configuration cfg=new Configuration().configure();factory=cfg.buildSessionFactory();}public static Session getSession() { return factory.openSession();}}

Step5:-

// main java class

//PersistTest.java

package r4r;import java.util.*;

import org.hibernate.Session;import org.hibernate.Transaction;public class PersistTest {

public static void main(String[] args) { Scanner in=new Scanner(System.in); Session session=SessionProvider.getSession(); Transaction t=session.beginTransaction(); while(true) { System.out.println("Enter Name:"); String n=in.nextLine(); System.out.println("Enter Job:"); String j=in.nextLine(); System.out.println("Enter Salary:"); int s=in.nextInt(); in.nextLine();// to remove unread newline character. Emp e=new Emp(n,j,s); session.save(e); System.out.println("want to persist more objects yes/no?"); String ans=in.nextLine(); if(ans.equals("no")) break; } t.commit(); session.close(); System.out.println("successfully persisted."); }

}

Commonly used classes and interfaces exposed by hibernate for application developer:-

Configurtion:- Configuration object is used by the hibernate to stored configuration information in object form.Configuration information data is required by hibernate to connect to a database and information of classes that are to be managed by hibernate.

SessionFactory:- It is a factory class which is used by application developer to create session.A part from this it can also be used to manage second level cache .

Session:-This is a main interface throw which application eveloper interact. This interface provide method for persistance object,creating tansaction and query objects for each user a different session is provided.

Transaction:-This interface is used by appliction developer to transact execution query.

Query:- This interface is used by he application developer to execute HQL query. HQL is a object version of sql used by hibernate.

A simple select program of Hibernate :-

1- Create hibernate.hbm.xml file



<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="Emp.hbm.xml"/></session-factory>


2- Create Emp.java class:-

package r4r;

public class Emp {

int id;

String name,job;

int salary;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getJob() {

return job;

}

public void setJob(String job) {

this.job = job;

}

public int getSalary() {

return salary;

}

public void setSalary(int salary) {

this.salary = salary;

}

}

3- Create Emp.hbm.xml file:-

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping><class name="mypack.Emp"><id name="id" type="int"></id><property name="name"></property><property name="job"></property><property name="salary" type="int"></property></class>

</hibernate-mapping>

4- Create Session provider class

// SessionProvider.java

package r4r;


public class SessionProvider {static SessionFactory factory;static{

Configuration cfg=new Configuration().configure();factory=cfg.buildSessionFactory();

}public static Session getSession(){return factory.openSession();}}

5- Create a main class

// SelectTest.java

package r4r;

import java.util.Scanner;

import org.hibernate.Session;import org.hibernate.Transaction;

public class SelectTest {public static void main(String rr[]){Session session=SessionProvider.getSession();Transaction t=session.beginTransaction();// List<Emp> list=new List<Emp>;Scanner in=new Scanner(System.in);System.out.println("enter id:-");int id=in.nextInt();Emp e=(Emp)session.load(Emp.class,id);System.out.println("followin records are fetched:-");System.out.println(e.getId()+"\t"+e.getName()+"\t"+e.getJob()+"\t"+e.getSalary());t.commit();session.close();

}}

Some Important Methods Of Hibernate:-

save():-

method of Session interface is used to persist object.

public void save (Object o);

delete():-

is used to remove a persistent object.

public void delete(Object o);

refresh():-

is used to Synchronized the state of a persistaent logc to the database.

public void refresh(Object o);

beginTransaction:-

is used to start a transaction.

public Transaction begintransaction();

createQuery:-

is used to obtain query object.Query object is used to run sql query.

public query createquery();

etc

ID Generator:-

Id generator is used to autogenerate id of objects.Different batabase support different types of generator.

most commonly used generaor that are supported by oracle are:

1-increment

2-sequential

1. increment:-

Increment generator uses highest value of primary key increases to generator id value.

Example:-

Consider previous example of Student,in which id generator is used as:


<hibernate-mapping><class name="r4r.Student"><id name="id" type="int"><generator class="increment"></generator></id><property name="name"></property><property name="course"></property>

</class>


2-Sequence Generator:-

sequence gnerator uses the sequence define in the database for generating id.

Example:-

Consider Emp example


<hibernate-mapping><class name="r4r.Emp"><id name="id" type="int"><generator class="sequence"><param name="sequence">oursequence</param>

</generator></id><property name="name"></property><property name="job"></property><property name="salary" type="int"></property></class>


Hibernate Mapping:-

There are two types of mapping:

1-Is -A Mapping

2-Has-A Mapping

1. Is-A Mapping:-

Is a relation between persistent object can be implemented in the following three ways-

1- Table per class Hierarchy

2- Table per subclass

3- Table per class

1- Table Per Class Hierarchy:- In this approach objects of all the classes of a family are mapped to a

single table in a database. This table contain field to represent combined data member of all the classes of

the family plus an additional fields is used to describe record of the table ,that is, to identified which record

of table represent object of which class of the family

Advantages Of This Approach:-

Major advantages of this approach is performance. Because hibernate need to manage toall

the classes to the family.

Disadvantages Of This Approach:-

1-Table is not normalized

2-Not Null constraint can not be applied non the field representing data member of subclass

2-Table Per Subclasses:-

In this approach one table for each class of the faimily is created. Table for the parent class contains field

to represenent parent class data member and table for the subclasses contains fields to represent their

own data member.

Primary key of parent table is used for hierarchy in table for subclasses.

Advantages-

Tables are noralized Not null constraint can be applied

Disadvantages:-

performance is degraded becouse to insert and fetched subclsses object .Multiple queries or joins are required

Tables are not fully normalized.

3-Table Per Class:-

In this approach one table for each class of the family is created. Each table contains

fields to represents declared as well as inherited data member of the class.

Advantages:-

Tables are fully normalized. Not null constraint cn be applied on all the table of fields. Better performance.

Disadvantages:-

Relation of object is losses in the table. This approach s not supported in the all ORM framework.

Has-A- Mapping:-

Has-A relation between object can be of following types:-

1-One-to-One (Unidirectional and bidirectional)

2-One-to-Many (Unidirectional and bidirectional)

3-Many-to-Many (Unidirectional and bidirectional)

1-One-to-One Mapping:-

One to one mapping between object can be implement with the three ways-

In case of unidirectional:-

1- Using primary key-foreign key relation

2- Using same primary Key

3-Using relation table

Disadvantages:-

This approach can only be used if relation between objects which be one to one .If in future

one to one is changed to one to many then this approach went to wrong.

1- Using Primary Key-Foreign Key Relation:-

Consider two classes first Address(owned object) and second Person(owner object) .In address there are

three fields ,id,street and city. And in person table it contains id,name,address.

Example:-

//hibernate.cfg.xml


<hibernate-configuration>

<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="PkFk.hbm.xml"/></session-factory>


//Address.java

package r4r;

public class Address {int id;String city,street;

public Address() {

}public Address(String city, String street) {super();this.city = city;this.street = street;

}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getCity() {return city;}public void setCity(String city) {this.city = city;}public String getStreet() {return street;}public void setStreet(String street) {this.street = street;}}

//Person.java

package r4r;

public class Person {int id;String name;Address address;

public Person() {super();}public Person(String name, Address address) {super();this.name = name;this.address = address;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}}

//PkFk.hbm.xml


<hibernate-mapping><class name="r4r.Address"><id name="id" type="int"><generator class="increment"></generator></id><property name="city"></property><property name="street"></property>

</class><class name="r4r.Person"><id name="id" type="int"><generator class="increment"></generator>

</id><property name="name"></property><many-to-one name="address" class="r4r.Address" column="addressid" unique="true" cascade="all"></many-to-one></class>


//InsertTest.java

package r4r;

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;

public class InsertTest {

public static void main(String[] args) {

try{Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();Session session=f.openSession();Transaction t=session.beginTransaction();Address a=new Address("noida","u.p");Person p=new Person("name",a);

session.save(a);session.save(p);t.commit();session.close();System.out.println("successfully inserted");}catch(Exception e){System.out.println("exception thrown");}

}

}

2-Same Primary Key Mapping:-

In this approach owner and owned shared same primary key value.

Advantages:-

It eliminate the need of foreign key.

Disadvantages:-

1- A special id is generator is required to used id of one object as id of another.

2- If it converted into one-to-many then this approach will not be used.

Example:-

//SamePk.hbm.xml


<hibernate-mapping><class name="r4r.Address"><id name="id" type="int"><generator class="increment"></generator></id><property name="city"></property><property name="street"></property>

</class><class name="r4r.Person"><id name="id" type="int">

<generator class="foreign"><param name="property">address</param></generator>

</id><property name="name"></property><one-to-one name="address" class="r4r.Address" cascade="all"></one-to-one></class>


3-Using Relation Table:-

In this approach the relation table is used to manage the relation between obect.

Primary key of both objects are used as foreign key in relation table .

Advantages:-

support one-to-many ,if any time one name has many address then it support it .

Disadvantage:-

Performance is degraded.

Example:-

In this approach three tables are used

1- Table for Batch(id,name)

2-Table for Trainer(id,name,fees)

3-Table for Relation(batchid,trainerid)


<hibernate-mapping><class name="r4r.Address"><id name="id" type="int"><generator class="increment"></generator>

</id><property name="city"></property><property name="street"></property>

</class><class name="r4r.Person" table="person3"><id name="id" type="int"><generator class="increment">

</generator>

</id><property name="name"></property><join table="addresses"><key column="personid">

<many-to-one name="address" class="r4r.Address" cascade="all" column="addressid" unique="true"></many-to-one></join></class></hibernate-mapping>

2-One-to-Many Mapping:-

This type of association relates one entity object to many object of another entity.

Example:-

Relationship between a department and employee.Many employee can work in a single department.

//hibernate.cfg.xml



<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="listAndBag.hbm.xml"/></session-factory>


// Batch.java

package r4r;

public class Batch {int id;String time,course,mode;Trainer trainer;public Batch() {super();}public Batch(String time, String course, String mode,Trainer t) {super();this.time = time;this.course = course;this.mode = mode;this.trainer=t;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getTime() {return time;}public void setTime(String time) {this.time = time;}public String getCourse() {return course;}public void setCourse(String course) {this.course = course;}public String getMode() {return mode;}public void setMode(String mode) {this.mode = mode;}public Trainer getTrainer() {return trainer;}public void setTrainer(Trainer trainer) {this.trainer = trainer;}}

//Trainer.java

package r4r;

import java.util.*;

public class Trainer {int id;String name;Set<Batch> batches;

public Trainer() {super();

}public Trainer(String name) {super();this.name = name;

}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Set<Batch> getBatches() {return batches;}public void setBatches(Set<Batch> batches) {this.batches = batches;} }

//sessionProvider.java

package r4r;


public class SessionProvider {static SessionFactory factory;static{Configuration cfg=new Configuration().configure();factory=cfg.buildSessionFactory();}public static Session getSession() {return factory.openSession();}}

//PersisTest.java

package mypack;

import java.util.*;

import org.hibernate.Session;import org.hibernate.Transaction;

public class PersistTest {

public static void main(String[] args) {Trainer tr=new Trainer("Rama");Batch b1=new Batch("9 to 11","Core", "w/d",tr);Batch b2=new Batch("12 to 3", "J2ee", "w/e",tr);Batch b3=new Batch("9 to 12", "Hibernate", "w/e",tr);Session s=SessionProvider.getSession();Transaction t=s.beginTransaction();s.save(b1);s.save(b2);s.save(b3);t.commit();s.close();System.out.println("persisted.");}

}

Many-To-Many Mapping:-

In order to implement many-to-many bidirectional relation between object.Each participants relation

object of the relation contains the properties.

One of these object is designed as the owner of the relation and the other is as owned by using

inwards attributes of collection mapping.

This type of relation relates many objects of an entity to many object of anothe entity.

Example:- consider an example of employee and privileges A employee can get many

privileges and many employee can get a single privileges.

So here is an many-to-many mapping

Example Of Many To Many Mapping:-

//hibernate.cfg.xml


<hibernate-configuration>

<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="m-to-m.hbm.xml"/></session-factory>


//Emp.java

package r4r;import java.util.*;public class Emp {

int id;String name,job;int salary;Set<Privilage> privilages;

public Emp() {super();// TODO Auto-generated constructor stub}public Emp(String name, String job, int salary, Set<Privilage> privilages) {super();this.name = name;this.job = job;this.salary = salary;this.privilages = privilages;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getJob() {return job;}public void setJob(String job) {this.job = job;}public int getSalary() {return salary;}public void setSalary(int salary) {this.salary = salary;}public Set<Privilage> getPrivilages() {return privilages;}public void setPrivilages(Set<Privilage> privilages) {this.privilages = privilages;}}

//Privilage.java

package r4r;

import java.util.Set;

public class Privilage {int id;String name;int cost;Set<Emp> employees;

public Privilage() {super();// TODO Auto-generated constructor stub}public Privilage(String name, int cost, Set<Emp> employees) {super();this.name = name;this.cost = cost;this.employees = employees;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getCost() {return cost;}public void setCost(int cost) {this.cost = cost;}public Set<Emp> getEmployees() {return employees;}public void setEmployees(Set<Emp> employees) {this.employees = employees;}}

//m-to-m.hbm.xml


<hibernate-mapping>

<class name="r4r.Privilage"><id name="id" type="int"><generator class="increment"></generator></id><property name="name"/><property name="cost" type="int"/><set name="employees" table="empprivilage" inverse="true"><key column="privilageid"/><many-to-many column="empid" class="r4r.Emp"/></set></class><class name="r4r.Emp"><id name="id" type="int"><generator class="increment"/></id><property name="name"/><property name="job"/><property name="salary"/><set name="privilages" inverse="true" cascade="all" table="empprivilage"><key column="empid"/><many-to-many column="privilageid" class="r4r.Privilage"/>

</set>

</class></hibernate-mapping>

//Selecttest.java

package r4r;

import java.util.Iterator;import java.util.Scanner;import java.util.Set;


public class Selecttest {


Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();Session session=f.openSession(); Scanner in=new Scanner(System.in); System.out.println("enter empid"); int empid=in.nextInt(); Emp emp=(Emp) session.load(Emp.class,empid); System.out.println("employees details"); System.out.println(emp.getName()+"\t"+emp.getJob()+"\

t"+emp.getSalary()); System.out.println("following privilages are enjoyed:"); Set<privilage> pr=emp.getPrivilages();

Iterator<privilage> itr=pr.iterator(); while(itr.hasNext()) {

Privilage pre=itr.next(); System.out.println(pre.getId()+"\t"+pre.getName()+"\

t"+pre.getCost());

}System.out.println("enter privilage id:");int privilageid=in.nextInt();Privilage privilages=(Privilage)

session.load(Privilage.class,privilageid);System.out.println("following privilage detais:");System.out.println(privilages.getName()+"\

t"+privilages.getCost());System.out.println("employee benifited are:-");Set<emp> emp11=privilages.getEmployees();System.out.println("following employees are benifited: ");

Iterator<emp> eitr=emp11.iterator();

while(eitr.hasNext()){

Emp e=eitr.next();System.out.println(e.getName()+"\t"+e.getJob()+"\

t"+e.getSalary());} session.close();

}

}

HQL (Hibernate Query Language):-

It is an object based version of SQL, it is used by hibernate to fetch data.

Hibernate even provide a criterion API that provide a type safe and object oriented

way to retrieve object from database.

Using SQL has following shortcoming:

1- SQL is standarized but it is vendor -dependent features.

2-SQL is designed more specifically to work with relational database tables but not object.

To overcome these issues Hibernate introduce its own object oriented query language called

Hibernate Query Language(HQL).

Advantages Of Using HQL:-

1- HQL queries are database independent.

2-HQL provide a support for ordering the result persist objects.

3-HQL is more object oriented which makes us write more easily than Sql.

4- HQL support pagination.

Step To Execute HQL queries Using Hibernate:-

The following three steps are required in executeing HQL queries.

1- Obtaining an instance of org.hibernate.Query

2-Customize the Query object

3-Execute the Query

Step 1- Obtaining an instance of org.hibernate.Query:-

A Query instance is obtained by calling Session.createQuery() or Session.getNamedQuery method.

The createQuery() method is used to create a new instance of Query for given HQL Query.

Step 2- Customize the Query object:-

After obtaining the query object we may want to customize it by setting query parameter ,cache mode ,

Flush mode,fetch size ,an upper limit for the result set.

Step 3- Execute the Query:-

After preparing the query object by setting all custom properties we use list(),scroll(),iterate or

uniqueResult().

Syntax Of HQL Queries:-

To fetch the all the object of a type:-

from classname as Alias

ex-

1- To fetch all the emp object:-

Query q=Session.createQuery("From Emp e")

-2- To fetch only Those object to class which satisfy given condition

from classname as Alias where condition

ex- To fetch all those employee who earn more 75000/month

from Emp e where e.salary>75000

3-To fetch name of all manager

select e.name from Emp e where e.job="manager"

Note:-HQL queries supports named as well as positioned parametersFirst Approach:-(positioned parameter):-Query q=session.createQuery("select e.name from Emp e e.job=?");q.setString(1,job);// value of positioned parameter is set.

Second Approach(Named parameter):-Query q=session.createQuery("from Emp e where e.salary>:salary");q.setInt("salary",s);

Simple Program Of Select in HQL:-

Step1- Create hibernate.cfg.xml



<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="Emp.hbm.xml"/></session-factory></hibernate-configuration>

Step2- Create Persitent class

//Emp.java

package mypack;


public Emp() {super();

}public Emp(String name, String job, int salary) {super();this.name = name;this.job = job;this.salary = salary;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getJob() {return job;}public void setJob(String job) {

this.job = job;}public int getSalary() {return salary;}public void setSalary(int salary) {this.salary = salary;}

}

//Emp.hbm.xml


<hibernate-mapping><class name="mypack.Emp"><id name="id" type="int"></id><property name="name"></property><property name="job"></property><property name="salary" type="int"></property>

</class></hibernate-mapping>

//PersistTest.java

package mypack;import java.util.*;

import org.hibernate.Query;import org.hibernate.Session;

public class PersistTest {

@SuppressWarnings("unchecked")public static void main(String[] args) {

Session session=SessionProvider.getSession();

Query q=session.createQuery("from Emp e");List<Emp> e=(List<Emp>) q.list();Iterator<Emp> itr=e.iterator();System.out.println("following data fetched");while(itr.hasNext()){

Emp emp=itr.next();

System.out.println(emp.getName()+"\t"+emp.getSalary());

}session.close();}}

Example of Select Program in HQL:-

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">


<session-factory> <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property> <property name="connection.username">system</property> <property name="connection.password">system</property> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <mapping resource="Student.hbm.xml"/> </session-factory>


Student.java

package mypack;

public class Student {int id;String name;String subject;

public Student() {super();

}public Student(String name, String subject) {

super();this.name = name;this.subject = subject;

}public int getId() {

return id;}public void setId(int id) {

this.id = id;}public String getName() {

return name;}public void setName(String name) {

this.name = name;}public String getSubject() {

return subject;}public void setSubject(String subject) {

this.subject = subject;}

}

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

<class name="mypack.Student" table="stud"> <id name="id" type="int"> <generator class="increment"/> </id> <property name="name"/> <property name="subject"/>

</class>


package mypack;

import java.util.Iterator;import java.util.List;

import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;

public class InsertDemo {


Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();Session session=f.openSession();Query q=session.createQuery("from Student");List<Student> student=q.list();Iterator<Student> itr=student.iterator();while(itr.hasNext()){

Student s=itr.next();System.out.println(s.getName());

}session.close();}

}

Hibernate Caching

caching is the facility of storing object temporally

in the memory . The purpose of caching to improve the performance by reducing database hits . If same object is

required by different session or user then it make sense to fetch them only one and to store them into the cache

so that they can provide the cache each time they are requested.

Hibernate support caching at two levels:-

1- First Level Caching

2-Second Level Caching

First Level Caching :-(Transactional scope caching):-

First level caching is implicitly enable. It is implemented by session .

Fist level caching is responsible for storing the object used by user.Object in this cache has transactional

scope, once the transaction is completed object of this cache are synchronize to the database and cache is

discarded.

Second Level Cache (Application Scope caching):-

Second level cache is not enable by default. This cache has a application scope,

Object in this cache are shared by multiple users. This cache is managed by sessionFactory

NOTE:- Hibernate does not provide implementation of Second level caching , it only

provide specification how second level cache should be implemented. Third party implementation of

second level cache are available:

.

1- EHCACHE ( Easy hibernate Caching)

2-OSCACHE (Open source caching)

Specification Of second Level Cache:-

Hibernate Specification says that cache provider must defined block in memory for

storing object. I these storing block objects are stored in it.

Each block must have name and must have some additional properties.

Second level cache is divided into two parts :-

1- Object cache

2-Query Cache

1-Object Cache:-

In object ache ,object along with there relation are stored in Simplified

Form.

2-Query Cache:-

In query cache, Queries are stored along with the ID of fetched object.

For the implementation of query cache two reasons are created in memory

1- In first reason query along with the value of parameter to stored as key and id of

returned object are stored as value.

2- In second region time stamp of query execution is stored. The Purpose of this region is

to identified whether result of query is valid or not

Program Of EHCache:-

Example: This example shows the implementation of EHCache

hibernate.cfg.xml:-



<session-factory> <property name="connection.username">system</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property> <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> <property name="connection.password">oracle</property> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <property name="hibernate.cache.provider_class">net.sf.ehcache.hibernate.EhCacheProvider</property> <property name="hibernate.cache.use_query_cache">true</property>

<property name="hibernate.cache.use_second_level_cache">true</property>

<property name="hibernate.generate_statistics">true</property> <property name="hibernete.ca"></property> <mapping resource="m-to-m.hbm.xml"/> </session-factory>


m-to-m.hbm.xml:-


<hibernate-mapping><class name="mypack.Previlige"><cache usage="read-write"/><id name="id" type="int"><generator class="increment" /></id><property name="name"/><property name="cost" type="int"/><set name="users" table="empPrevilige" inverse="true"><key column="previligeId"/><many-to-many class="mypack.Emp" column="empId" /></set></class><class name="mypack.Emp"><cache usage="read-write"/><id name="id" type="int"><generator class="sequence" ><param name="sequence">keygenerator</param></generator></id><property name="name" /><property name="job" /><property name="salary" type="int"/><set name="previliges" table="empPrevilige" cascade="all"><cache usage="read-write"/><key column="empId"/><many-to-many class="mypack.Previlige" column="previligeId" /></set>

</class>


ehcache.xml:-


<hibernate-mapping><class name="mypack.Previlige"><cache usage="read-write"/><id name="id" type="int"><generator class="increment" /></id><property name="name"/><property name="cost" type="int"/><set name="users" table="empPrevilige" inverse="true"><key column="previligeId"/><many-to-many class="mypack.Emp" column="empId" /></set></class><class name="mypack.Emp"><cache usage="read-write"/><id name="id" type="int"><generator class="sequence" ><param name="sequence">keygenerator</param></generator></id><property name="name" /><property name="job" /><property name="salary" type="int"/><set name="previliges" table="empPrevilige" cascade="all"><cache usage="read-write"/><key column="empId"/><many-to-many class="mypack.Previlige" column="previligeId" /></set></class>


Emp.java:-

package r4r;import java.util.*;public class Emp {

int id;String name,job;int salary;

Set<Previlige> priviliges;


}public Emp(String name, String job, int salary, Set<Previlige>

priviliges) {super();this.name = name;this.job = job;this.salary = salary;this.priviliges = priviliges;





this.name = name;}public String getJob() {

return job;}public void setJob(String job) {

this.job = job;}public int getSalary() {

return salary;}public void setSalary(int salary) {

this.salary = salary;}public Set<Previlige> getPriviliges() {

return priviliges;}public void setPriviliges(Set<Previlige> priviliges) {

this.priviliges = priviliges;}

}

Previlage.java:-

package r4r;


public class Previlige {int id;String name;int cost;Set<Emp> users;

public Previlige() {super();

}public Previlige(String name, int cost) {

super();this.name = name;this.cost = cost;





this.name = name;}public int getCost() {

return cost;}public void setCost(int cost) {

this.cost = cost;}public Set<Emp> getUsers() {

return users;}public void setUsers(Set<Emp> users) {

this.users = users;}}

SessionProvider.java:-

package r4r;


public class SessionProvider {static SessionFactory factory;static{Configuration cfg=new Configuration().configure();factory=cfg.buildSessionFactory();

}public static Session getSession() {

return factory.openSession();}

}

S2Test.java:-

package r4r;

import java.util.*;import org.hibernate.*;import org.hibernate.cfg.Configuration;import org.hibernate.stat.SecondLevelCacheStatistics;

public class S2Test {

public static void main(String[] args) {try{

Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();for(int i=1;i<=2;i++){Session s=f.openSession();Date d1=new Date();Emp e=(Emp)s.load(Emp.class, 52501);Set<Previlige> set=e.getPriviliges();Date d2=new Date();System.out.println("query took "+(d2.getTime()-

d1.getTime())+" milliseconds "+i+" time.");

System.out.println("Emp Details:");System.out.println(e.getName()+"\t"+e.getJob()+"\t"+

e.getSalary());System.out.println("previliges details...");Iterator<Previlige> itr=set.iterator();while(itr.hasNext()){

Previlige pr=itr.next();System.out.println(pr.getId()+"\t"+pr.getName()+"\

t"+pr.getCost());

}s.close();SecondLevelCacheStatistics sts1 = f.getStatistics().getSecondLevelCacheStatistics("mypack.Emp");System.out.println("details of Emp cache region:");System.out.println(sts1);SecondLevelCacheStatistics sts2 = f.getStatistics().getSecondLevelCacheStatistics("mypack.Previlige");System.out.println("details of previlige cache region:");System.out.println(sts2);

}}catch(Exception e)

{

System.out.println(e);

}}

}

Working With Collection In Hibernate:-

Collection is widely used in hibernate .

Example:--

hibernate.cfg.xml



<session-factory> <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property> <property name="connection.username">system</property> <property name="connection.password">system</property> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <mapping resource="ListCollection.hbm.xml"/> </session-factory>



<hibernate-mapping><class name="r4r.Songs" table="songs"><id name="id" type="int"><generator class="increment" ></generator></id><property name="info"/></class>

<class name="r4r.Persons" table="persons"><id name="id" type="int"><generator class="increment"></generator></id><property name="name"/><bag name="song" table="songs1" cascade="all"> <key column="personid"/><many-to-many class="r4r.Songs" column="songid"/></bag></class></hibernate-mapping>

package r4r;

import java.util.List;

public class Persons {

int id;String name;List<Songs> song;

public Persons() {super();// TODO Auto-generated constructor stub

}public Persons(String name, List<Songs> song) {

super();this.name = name;this.song = song;





this.name = name;}public List<Songs> getSong() {

return song;}public void setSong(List<Songs> song) {

this.song = song;}

}

package r4r;

public class Songs {

int id;String info;

public Songs() {super();

}public Songs(String info) {

super();this.info = info;



this.id = id;}public String getInfo() {

return info;}public void setInfo(String info) {

this.info = info;}

}

package r4r;

import java.util.ArrayList;

import org.hibernate.Session;import org.hibernate.SessionFactory;

import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;



try{Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();Session session=f.openSession();ArrayList<Songs> list=new ArrayList<Songs>();list.add(new Songs("mast mast laila"));list.add(new Songs("dhink ckika"));Persons p=new Persons("sushant",list);Transaction t=session.beginTransaction();session.save(p);t.commit();

session.close();System.out.println("successfully inserted");}catch(Exception e){

System.out.println(e);}

}

}

Struts Hibernate Connectivity:-

There is a code of Struts and hibernate connectivity ,Steps required are as follows:

This example show how to create login form using struts and hibernate.

Creating hibernate.cfg.xml file



<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property>

<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="Login.hbm.xml"/></session-factory>


Creating Login.hbm.xml file


<hibernate-mapping><class name="mypack.Login"><id name="id"><generator class="increment"/></id><property name="name"/><property name="password"/></class>


Creating Java Persistent Class named Login.java

package mypack;

public class Login {

int id;String name,password;

public Login() {super();

}public Login(String name, String password) {super();this.name = name;this.password = password;}public int getId() {return id;}public void setId(int id) {this.id = id;}

public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

Creating Jsp pages:

//index.jsp

<%@taglib uri="/struts-tags" prefix="s"%><s:form action="login"><s:textfield name="name" label="Name"></s:textfield><s:textfield name="password" label="Password"></s:textfield><s:submit value="submit"></s:submit></s:form>

//a.jsp

<b>successfully login</b>

//b.jsp

<b>incorrect username or password</b>

-Creating DAO class

package mypack;

import java.util.Iterator;

import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;

public class DAO {

@SuppressWarnings("unchecked")public boolean find(String name,String password){Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();Session session=f.openSession();//Scanner in=new Scanner(System.in);Query q=session.createQuery("from Login e where e.name=? and e.password=?");q.setParameter(0,name);q.setParameter(1,password);Iterator<Login> itr=q.iterate();while(itr.hasNext()){

session.close();return true;}session.close();return false;}}

-Creating Struts.xml file

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="demo" extends="struts-default"><action name="login" class="mypack.LoginAction"><result name="success">/a.jsp</result><result name="failure">/b.jsp</result></action></package></struts>

Creating LoginAction.java class

package mypack;

public class LoginAction {

Login l;String name;String password;

public String execute(){DAO dao=new DAO();if(dao.find(getName(), getPassword()))

return "success";elsereturn "failure";

}

public Login getL() {return l;}

public void setL(Login l) {this.l = l;}

public String getName() {return name;}

public void setName(String name) {this.name = name;}

public String getPassword() {return password;}

public void setPassword(String password) {this.password = password;}}

Servlet And Hibernate Connectivity:-

This example shows the connectivity between servlet and hibernate

hibernate.cfg.xml


<hibernate-configuration>

<session-factory><property name="dialect">org.hibernate.dialect.Oracle9Dialect</property><property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property><property name="connection.username">system</property><property name="connection.password">system</property><property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property><mapping resource="personal.hbm.xml"/></session-factory>


personal.java(pojo class)

package mypack;

public class personal {int id;String name;String Student;String specializationin;

public personal() {super();

}public personal(String name, String student, String specializationin) {super();this.name = name;Student = student;this.specializationin = specializationin;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getStudent() {return Student;}public void setStudent(String student) {Student = student;}public String getSpecializationin() {return specializationin;}public void setSpecializationin(String specializationin) {this.specializationin = specializationin;}}

personal.hbm.xml


<hibernate-mapping><class name="mypack.personal"><id name="id" type="int"><generator class="increment"/>

</id><property name="name"/><property name="student"/><property name="specializationin"/>

</class>


index.jsp

<html><body><form action="Detail" method="get">Name<input type="text" name="id" value=""/><input type="submit" value="submit"/></form>

</body></html>

Detail.java(servlet class)

package mypack;

import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;


public class Detail extends HttpServlet {

private static final long serialVersionUID = 1L;SessionFactory f;Session session;

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {

String name=request.getParameter("id");

int name1=Integer.parseInt(name);

response.setContentType("text/html");PrintWriter out=response.getWriter();

Configuration cfg=new Configuration().configure();f=cfg.buildSessionFactory();session=f.openSession();personal p=(personal) session.get(personal.class,name1);

out.println("<html");out.println("<body><table border=1>");out.println("<tr><td>name</td><td>student</td><td>specialisationin</td></tr>");out.println("following record are fetched:");out.print("<tr><td>");out.print(p.getName());out.print("</td>");out.print("<td>");out.print(p.getStudent());out.print("</td");out.print("<td>");out.print(p.getSpecializationin());out.print("</td");out.print("</tr>");out.println("</table></body>");out.println("</html>");

session.close();}}

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>Detail</servlet-name><servlet-class>mypack.Detail</servlet-class></servlet>

<servlet-mapping><servlet-name>Detail</servlet-name><url-pattern>/Detail</url-pattern></servlet-mapping>

</web-app>

Registration Form Using Struts Hibernate

First add capabilities of Struts and hibernate Then:-.

hibernate.cfg.xml



<session-factory> <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property> <property name="connection.username">system</property> <property name="connection.password">system</property> <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property> <mapping resource="Registration.hbm.xml"/> </session-factory>


Registration.java

package mypack;

public class Registration {int id;String name,password,email;

public Registration() {super();

}public Registration(String name, String password, String email) {

super();this.name = name;this.password = password;this.email = email;





this.name = name;}public String getPassword() {

return password;}public void setPassword(String password) {

this.password = password;}public String getEmail() {

return email;}public void setEmail(String email) {

this.email = email;}

}

Registration.hbm.xml


<hibernate-mapping><class name="mypack.Registration"><id name="id" type="int"><generator class="increment"></generator></id><property name="name"/><property name="password"/><property name="email"/></class>


DAO.java

package mypack;

import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;

public class DAO {

public void insert(Object o){

Configuration cfg=new Configuration().configure();SessionFactory f=cfg.buildSessionFactory();Session session=f.openSession();Transaction t=session.beginTransaction();session.save(o);t.commit();session.close();

}}

index.jsp

<%@ taglib uri="/struts-tags" prefix="s"%><s:form action="Reg"><s:textfield name="r.name" label="name"></s:textfield><s:textfield name="r.password" label="password"></s:textfield><s:textfield name="r.email" label="email"></s:textfield><s:submit value="register"></s:submit>

</s:form>

a.jsp

<b>successfully inserted</b>

Struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="demo" extends="struts-default"><action name="Reg" class="mypack.RegistrationAction"><result name="success">/a.jsp</result></action></package></struts>

RegistrationAction.java

package mypack;

public class RegistrationAction {

Registration r;public String execute(){

DAO dao=new DAO();dao.insert(r);return "success";

}public Registration getR() {

return r;}public void setR(Registration r) {

this.r = r;}

}

Spring Frame work 2.5

51.How can integrate Struts 2.x and Spring Framework

51.1.Introduction:-The Struts 2.x is the web application framework in Java Technology, this framework provide the concept of Model View Controller (MVC) and Interceptor to develop the web application. The Spring framework provide the facility to integrate with other framework and Developed the application in java. This tutorial provide the facility how can integrate between Spring framework and Struts 2.x .

51.2.How can integrate Spring framework and Struts 2.x:-

Following steps are required to integrate Spring framework and Struts 2.x framework:-

Step 1:-First select the web project in our IDE and add the capability of spring 2.5 and Struts 2.x (it means that add the jar file ).

Step 2:-Also add struts2-spring-plugin-2.0.jar file.

Step 3:-Create configuration file struts.xml in src folder to give the struts configuration information.

Step 4:-Also create applicationContext.xml in WEB-INF folder to give the spring configuration information.

Step 5:-Create Action class to send the string of controller class to invoked the jsp page.

Step 6:-Mapped the ContextLoaderListener class in web.xml file.

52.Example of Struts 2.x ,Spring 2.5 integration

52.1.Introduction:-This tutorial provide the example to integrate between struts2 and spring framework.

52.2 .Technology use to run this source code:-

1.Spring2.5 jar file

2.Eclips Id

3.Tomcat Server

52.3 .Source Code:-

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Struts2Example14</display-name>

<filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter><listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener><filter-mapping>

<filter-name>struts2</filter-name><url-pattern>/*</url-pattern>

</filter-mapping><welcome-file-list>

<welcome-file>index.jsp</welcome-file></welcome-file-list>

</web-app>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans> <bean id="helloWorldClass" class="org.r4r.HelloWorld" > </bean></beans>

struts.xml

<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd">

<struts> <package name="default" extends="struts-default"> <action name="helloWorld" class="helloWorldClass"> <result name="success">/success.jsp</result> </action> </package></struts>

HelloWorld.java

package org.r4r;

public class HelloWorld {

private String message;

public String getMessage() {return message;

}

public void setMessage(String message) {this.message = message;

}

public String execute() { return "success"; }}

index.jsp

<%@taglib uri="/struts-tags" prefix="s"%><s:form action="helloWorld"><s:textfield name="message" label="Name"></s:textfield><s:submit></s:submit></s:form>

success.jsp

<%@taglib uri="/struts-tags" prefix="s"%>

Welcome, <s:property value="message"/>

OutPut:-

1. Introduction of Spring Framework 2.5

1.1 .Introduction :-The Spring Framework is a lightweight open source application framework that provide facility to develop enterprise application in java platform.

Spring is an application framework i.e based on two concept first one is IOC (Inversion of Control ) and second one is AOP (Aspect Oriented Programming ). This framework does not confined it self to any specific domain or API. It can be used a console application , web application , enterprise application etc. It mean that this is a general purpose framework.

1.2 .Overview :-The Spring Framework is a general purpose framework that provide following modules.

Modules of Spring Framework

1.3 .Scope of Spring Framework :- There are many scope of spring framework which are Core , AOP , Context , TX , JDBC , ORM , Web MVC , Web , Struts Integration , Enterprise Integration and Testing . Spring all scope which are describe following :-

Core:-This modules provide basic implementation of IOC container. It provide Dependency injection, Object creation and Lifecycle management .The important basic concept is factory method to control the object creation by the IOC container and application developer using singleton or prototype model.

AOP (Aspect Oriented Programming ):- This modules build over the core and provide the concept of cross-cutting concern. The cross-cutting concern first one is concern , the concern is a task that perform as part of an operation and second one is cross-cutting, the cross-cutting is a set of concern that participate multiple operation.

Context:- This modules build over the core and represent the advance implementation of IOC container.

TX (Transaction Management):-This modules build over the AOP and provide facility to manage transaction in spring.

JDBC:-This modules build over the TX modules and provide template implementation of JDBC.

ORM (Object Relation Mapping):-This modules build over the JDBC that provide the facility of integration spring application to ORM framework such as Hibernate , Toplink etc

Web:-This module is build over context provide automation of common operation of web application such as transfer of request ,data to domain object ,file uploading ,tiles convention etc.

Web MVC:-This module build over the web and provide an MVC implementation of spring for developing web application.

Struts Integration:-This module build over the web and provide facility to integrate spring application to struts.

Enterprise Integration:-This module provide facility of integration enterprise services such as JNDI ,JMS ,Java Mail ,Web Services etc. to Spring application.

Testing:-This module over the core and provide the facility of unit an integration of testing.

1.4 .Concept of Spring Framework :-The Spring Framework work in two concept which are following:-

A. IOC (Inversion of Control)

B. AOP (Aspect Oriented Programming)

Inversion of Control (IOC):- The inversion of control (IOC) provide the facility to creation of object ,dependency satisfaction and lifecycle management.

Aspect Oriented Programming (AOP):-The Aspect Oriented Programming (AOP) provide the concept of cross-cutting concern. The cross-cutting concern first one is concern , the concern is a task that perform as part of an operation and second one is cross-cutting, the cross-cutting is a set of concern that participate multiple operation.

2. IOC Concept of Spring Framework

2.1 .Introduction :-The spring framework work the concept inversion of control , this concept provide the facility to create an object ,satisfied the dependency and lifecycle management. In the case of conventional approach creation of an object ,dependency satisfaction and lifecycle management all of these task are responsible for application developer.

Problem associated with conventional usage of an object:-

1. An application developer need to focus on object creation ,dependency satisfaction and lifecycle management in addition to object usage.

2. Conventional method create tight coupling between object and there user. The tight coupling always create maintenance problem.

3. Conventional approach result in memory wastage because each user creates own object which prevent object reusability.

IOC propose the runtime environment called IOC container that should be used by the application developer to request object. If creation of an object their dependency satisfaction and lifecycle management is manage by IOC container then application developer can focus on used to object. Object can be shared among and loose coupling between object and user can be provided. Following two approach are used to provide the Implementation of IOC.

A. Dependency Injection

B. Dependency Lookup

2.2 .Dependency Injection (DI):-In case of DI (Dependency Injection) ,dependency of object are satisfied by IOC container on its own i.e IOC container are not ask to satisfied the dependency of an object.

2.3 .Dependency Lookup (DL):-In case of DL (Dependency Lookup) ,dependency of an object are satisfied only when IOC container is asked to do so.

Note:-The spring framework does not support dependency lookup (DL) only support dependency injection (DI) approach.

3. Terminology of Spring Framework

3.1 .Bean :-Bean definition object represented by the XmlBeanFactory (DefaultListableBeanFactory). the bean manage object creation ,dependency satisfaction through the IOC container which contain following details:-

the <bean> element is used to specify the configuration of a bean to IOC container. the syntax of <bean > element.

<bean id="UniqueIdentifier" name="alias" class="BeanClass" scope="singleton/prototype" factory-method="Name of factory method" factory-bean="Name of factory bean">

3.2 .Bean Tag Element:-There are many types of bean tag element in the spring framework which are following:-

1. id and name:-The bean identify in which type of bean class are requested by the user.

2. class:-The bean class provide the information of requested by user.

3. singleton and prototype:-The bean create object one time in the case of singleton and bean create object requirement of user it means more then one time in the case of proto type.

4. constructor argument:-This configuration provide value in constructor of the bean class if which are defined in bean class. This configuration used in constructor injection.

5. property bean:-This configuration set the value in setter method which are define in the bean class. This configuration used in setter injection.

3.3 .Identify Bean by IOC container:-IOC container usage id, name and class attribute is same sequence to identify a bean.

3.4 .Resource:-Resource is an interface provided by the framework it contain method for managing configuration information. The configuration information represent information required by IOC container for creating ,dependency satisfaction and lifecycle management of bean.

3.5 .BeanFactory:-BeanFactory is an interface provided by spring framework . This interface represent the functionality of basic IOC container . Implementation of it is provided by the framework.

4. Hello World Example in Spring Framework

Introduction:-The Hello world example in spring framework uses the constructor injection. It means that object is created by the IOC container through the constructor.

Class/Library File Descriptions:-First of all we are create bean class name Hello then define the parameterize constructor and define a method name display which are print string sanded by configuration XML file.

Configuration information syntax:-

<bean id="hello" class="org.r4r.Hello"><constructor-arg value="Hello World !"/></bean>Technologies used to run this source code:-

1. Spring 2.52. Eclipse 3. JDK 1.6

Source Code:-applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?><beans

xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="hello" class="org.r4r.Hello"><constructor-arg value="Hello World !"/></bean></beans>

Hello.java

package org.r4r;

public class Hello {String hello;

public Hello(String hello) {super();this.hello = hello;

}public void display(){

System.out.println(hello);}

}

HelloTest.java

package org.r4r;

import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.Resource;

public class HelloTest {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);Hello h=(Hello)f.getBean("hello");h.display();

}

}

OutPut:-

Hello World !

5.Creation of an Object in Spring Framework

5.1 .Introduction :-In the Spring Framework provide the concept IOC container which are responsible for creation of an object, satisfied the dependency and lifecycle management. First task of the IOC container is creation of an objects. Objects can be create through constructor and factory method.

By default IOC container create object using constructor. In order to facilitate object creation using factory method. Information of the factory need to be provided.

5.2 .Type of Object Creation :-In the spring framework concept IOC container which are create an object following two type

a. Using Constructor

b. Using Factory Method

5.3 .Object Creation Using Constructor :-IOC container create object through the constructor, If we are creating object through IOC container first you are declare parameterize constructor in our bean class and define method to print any message through the configuration file. The following syntax used in configuration file if we are create object through the constructor

<bean id="hello" class="org.r4r.Hello"><constructor-arg value="Hello World !"/></bean>

5.4 .Object Creation Using factory method :-IOC container create object through the factory method, If we are creating object through IOC container first you are declare parameterize method in our bean class and print any message through the configuration file. The following syntax used in configuration file if we are create object through the factory method.<bean id="number" class="org.r4r.Complex" factory-method="getNumber" scope="prototype"/>

Factory method can be divided in following three way:-

5.4.1. Same class static factory:-

class A{

private(){

//Logic is written

}

public static A getA(){

return new A();

}

}

Following configuration need to provided to the IOC container to use getA() factory method.

<bean id="a" class="A" factory-method="getA"/>

5.4.2. Different class static factory:-

class B{

{

==

}

class A{ //Different class static factory

public static B getB(){

return new B();

}

}

Following configuration need to provided the IOC container to use getB() factory method.

<bean id="b" class="A" factory-method="getB"/>

5.4.3. Different class non-static factory:-

class B{

{

==

}

class A{ //Different class nonstatic factory

public B getB(){

return new B();

}

}

Following configuration need to provide the IOC container to use getB() factory method.

<bean id="a" class="A"/>

<bean id="b" class="B" factory-method="getB" factory-bean="a"/>

6.Object Create Example Using Constructor

Introduction:-This example will used to create object through the constructor and print "This Object is created by constructor".

Technology use to run this source code:-

1. Spring 2.52. Eclipse3. JDK 1.6

Source Code

:-



xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="constructorBean" class="org.r4r.ConstructorExample"><constructor-arg value="This message is generated by Constructor."/></bean></beans>

ConstructorExample.java

package org.r4r;

public class ConstructorExample {String message;

public ConstructorExample(String message) {super();this.message = message;


System.out.println("This message is generated by method.");System.out.println(message);

}

}

ConstructorTest.java

package org.r4r;


public class ConstructorTest {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);ConstructorExample e=(ConstructorExample)f.getBean("constructorBean");e.display();

}

}

OutPut:-

This message is generated by method.

This message is generated by Constructor.

7.Object Create Example Using Same Class Static Factory

Introduction:-This example will used to create object through the same class static factory and print "Number you are enter and sum of number which are enter by you".


1. Spring 2.5

2. Eclipse3. JDK 1.6

Source Code

:-




<bean id="number" class="org.r4r.NumberDisplay" factory-method="getNumber" scope="prototype"/></beans>

NumberDisplay.java

package org.r4r;


public class NumberDisplay {int a,b;

public NumberDisplay(int a, int b) {super();this.a = a;this.b = b;

}public static NumberDisplay getNumber(){

Scanner in=new Scanner(System.in);System.out.println("Enter the first number:-");int x=in.nextInt();System.out.println("Enter the second number:-");int y=in.nextInt();return new NumberDisplay(x,y);


System.out.println("You are enter first number is:-\t"+a);System.out.println("You are enter second number is:-\t"+b);int x=a+b;System.out.println("Sum of both number is:-"+x);

}

}

NumberTest.java

package org.r4r;


public class NumberTest {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining numbers from the IOC Container...");NumberDisplay n1=(NumberDisplay)f.getBean("number");n1.display();

}

}

OutPut:-Obtaining numbers from the IOC Container...Enter the first number:-9876Enter the second number:-6789You are enter first number is:- 9876You are enter second number is:- 6789Sum of both number is:-16665

8.Object Create Example Using Different Class Static Factory

Introduction:-This example will used to create object through the different class static factory and print "Number you are enter and sum of number which are enter by you".



Source Code

:-



xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"

xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="number" class="org.r4r.NumberFactory" factory-method="getNumber"/>

</beans>

NumberFactory.java

package org.r4r;


public class NumberFactory {public static NumberDisplay getNumber(){

Scanner in=new Scanner(System.in);System.out.println("Enter the first number:-");int x=in.nextInt();System.out.println("Enter the second number:-");int y=in.nextInt();return new NumberDisplay(x,y);

}

}

NumberDisplay.java

package org.r4r;





}

}

NumberTest.java

package org.r4r;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.Resource;



}

}


9.Object Create Example Using Different Class Non-Static Factory

Introduction:-This example will used to create object through the different class Non-static factory and print "Number you are enter and sum of number which are enter by you".



Source Code

:-




<bean id="number1" class="org.r4r.NumberFactory"><constructor-arg value="1"></constructor-arg></bean>

<bean id="number" factory-bean="number1" factory-method="getNumber" scope="prototype"></bean></beans>

NumberFactory.java

package org.r4r;


public class NumberFactory {static final int NumberDisplay=1;int number;

public NumberFactory(int number) {super();this.number = number;

}public void getNumberFactory(){

number=NumberDisplay;

}

public NumberDisplay getNumber(){Scanner in=new Scanner(System.in);System.out.println("Enter the first number:-");int x=in.nextInt();System.out.println("Enter the second number:-");int y=in.nextInt();return new NumberDisplay(x,y);

}

}

NumberDisplay.java

package org.r4r;





}

}

NumberTest.java

package org.r4r;




}

}


10.Scope attribute of bean

10.1 .Introduction:-Spring framework provide the facility how many time you creating object through the IOC container. If you want this object is create only one time or more the one time then you give the all information in our configuration file. Through "SCOPE" attribute Spring framework provide this solution. If you are define "SCOPE" attribute in bean tag element then developer choose two option first option if you create object only one time then give "SINGLETON BEAN" in scope attribute and you create object more then one time then give "PROTOTYPE BEAN" in scope attribute.

10.2 .Type of Scope attribute of bean:-There are two types of bean in SCOPE attribute which are following:-

1. Singleton Bean

2. Prototype Bean

10.2.1 .Singleton Bean:-This bean provide the facility to create only one bean if any user request bean then same bean provide more then one user.

Syntax of Singleton bean:-

<bean id=" " factory-bean=" " factory-method=" " scope="singleton"></bean>

10.2.2 .Prototype Bean:-This bean provide the facility to request more then one bean if any user request bean then different bean provide each request.

Syntax of Prototype bean:-

<bean id=" " factory-bean=" " factory-method=" " scope="prototype"></bean>

11.Example of singleton bean

Introduction:-The singleton bean is the default bean of the scope attribute that provide the facility to the user create only one time object then give the reference of same object if requested by user for this object. If you are not mansion in configuration file this scope attribute give service by default.



Source Code:-




<bean id="number" class="org.r4r.Complex" factory-method="getNumber" scope="singleton"/>

</beans>

Number.java

package org.r4r;

public interface Number {public void display();public Number add(Number n);

}

Complex.java

package org.r4r;


public class Complex implements Number {int r,i;

public Complex(int r, int i) {super();this.r = r;this.i = i;

}public static Number getNumber(){

Scanner in=new Scanner(System.in);System.out.println("Enter the rational part:-");int x=in.nextInt();System.out.println("Enter the imagenary part:-");int y=in.nextInt();return new Complex(x,y);

}

@Overridepublic Number add(Number n) {

Complex c=(Complex)n;int x=this.r+c.r;int y=this.i+c.i;return new Complex(x,y);

}

@Overridepublic void display() {

System.out.println(r+"+"+i+"i");}

}

IocNumberUser.java

package org.r4r;


public class IocNumberUser {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);

System.out.println("Obtaining numbers n1 & n2 from the IOC Container...");Number n1=(Number)f.getBean("number");Number n2=(Number)f.getBean("number");System.out.println("Number n1 is:");n1.display();System.out.println("Number n2 is:");n2.display();Number n3=n1.add(n2);System.out.println("Sum of n1 and n2");n3.display();

}

}

OutPut:-

Obtaining numbers n1 & n2 from the IOC Container...Enter the rational part:-5Enter the imagenary part:-6Number n1 is:5+6iNumber n2 is:5+6iSum of n1 and n210+12i

12.Example of prototype bean

Introduction:-The prototype bean is the optional bean of the scope attribute that provide the facility to the user create more then one object if you are requested more then one time the prototype bean provide per request new object of same bean..



Source Code:-




<bean id="number" class="org.r4r.Rational" factory-method="getNumber" scope="prototype"/>

</beans>

Number.java

package org.r4r;

public interface Number {public void display();public Number add(Number n);

}

Rational.java

package org.r4r;


public class Rational implements Number {int p,q;

public Rational(int p, int q) {super();this.p = p;this.q = q;

}public static Number getNumber(){

Scanner in=new Scanner(System.in);System.out.println("Enter the Numerator part:-");int p=in.nextInt();System.out.println("Enter the Denominator part:-");int q=in.nextInt();return new Rational(p,q);

}

@Overridepublic Number add(Number n) {

Rational r=(Rational)n;int x=this.p*r.q+this.q*r.p;int y=this.q*r.q;return new Rational(x,y);

}

@Overridepublic void display() {

System.out.println(p+"/"+q);}

}

IocNumberUser

.java

package org.r4r;


public class IocNumberUser {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining numbers n1 & n2 from the IOC Container...");Number n1=(Number)f.getBean("number");Number n2=(Number)f.getBean("number");System.out.println("Number n1 is:");n1.display();System.out.println("Number n2 is:");n2.display();Number n3=n1.add(n2);System.out.println("Sum of n1 and n2");n3.display();

}

}

OutPut:-

Obtaining numbers n1 & n2 from the IOC Container...Enter the Numerator part:-6Enter the Denominator part:-5Enter the Numerator part:-4Enter the Denominator part:-8Number n1 is:6/5Number n2 is:4/8Sum of n1 and n268/40

13.Dependency Injection

13.1 .Introduction:-In case of DI (Dependency Injection) ,dependency of object are satisfied by IOC container on its own i.e IOC container are not ask to satisfied the dependency of an object.

13.2 .Approach of Dependency Injection:-There are two approach of Dependency Injection which are following:-

1. Constructor Dependency Injection

2.Setter Dependency Injection

13.2.1 .Constructor Dependency Injection:-In this approach the IOC container provide the facility to satisfied the dependency of an object in mandatory case and IOC container inject the dependency through the constructor.

13.2.1 .Setter Dependency Injection:- In this approach the IOC container inject the dependency through the default constructor and setter method. This approach is used in the case of optional dependency.

13.3 .Type of Dependency Injection:-There are three type of dependency injection which are following:-

1. Dependency on primitive values (String is consider primitive by String).

2. Dependency on Object.

3. Dependency on Collection.

13.3.1 .Dependency on primitive value:-In the case of constructor injection, constructor-arg is the sub element of <bean ......> is used to specified the dependency of a bean i.e to be satisfied to a constructor this elements uses values and reference attribute which are used to specified value primitive type and object respectively.

Syntax:-

<bean .................>

<constructor-arg value="primitive or String"/>

<constructor-arg ref="Reference of a bean"/>

................

</bean>

13.3.2 .Dependency on object:-In the case of constructor injection, constructor-arg is the sub element of <bean ......> is used to specify the dependency of an object i.e to be satisfied the constructor-arg element uses reference of an attribute which are used to specify object respectively.

Syntax:-

<bean .................>

<constructor-arg >

<list><ref bean="Reference of a bean"/>

................

</list></constructor-arg>

</bean>

13.3.2 .Dependency on collection:-In the case of constructor injection, constructor-arg is the sub element of <bean ......> is used to specify the dependency of a collection i.e to be satisfied

the constructor-arg element uses list ,set and map sub element to specify the dependency of list ,set and map respectively.

Syntax:-

<bean .................>

<constructor-arg >

<list or set or map>

<Value></value>

................

</list or set or map></constructor-arg>

</bean>

14.Example of Constructor Injection

Introduction:-In the dependency injection satisfied the dependency of an object through the constructor dependency injection. Following this example inject the dependency using the constructor.



Source Code:-




<bean id="ab" class="org.r4r.A"><constructor-arg value="101" /><constructor-arg value="Mukund Singh" /></bean>

</beans>

A.java

package org.r4r;

public class A {int a;String b;public A(int a,String b) {

super();this.a=a;this.b =b;System.out.println("Constructor is invoked");

}public void display() {

System.out.println(a+"\t\t"+b);}}

Test.java

package org.r4r;


public class Test {public static void main(String ar[]){

Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Constructor value are following");A a1=(A)f.getBean("ab");a1.display();

}

}

OutPut:-Constructor value are followingConstructor is invoked101 Mukund Singh

15.Example of Setter Injection

Introduction:-In the dependency injection satisfied the dependency of an object through the setter injection. Following this example inject the dependency using the default constructor and setter method.



Source Code:-




<bean id="a1" class="org.r4r.A"/><bean id="a2" class="org.r4r.A"><constructor-arg value="10"/></bean><bean id="a3" class="org.r4r.A"><property name="a" value="100"/></bean></beans>

A.java

package org.r4r;

public class A {int a;

public A(int a) {super();this.a = a;System.out.println("A is instantiated using parameter constructor.");System.out.println("Value of a:-\t"+a);

}

public A() {super();System.out.println("A is instantiated using Default constructor.");

}

public void setA(int a) {this.a = a;System.out.println("Value of A is set by setA() method.");System.out.println("Value of a:-\t"+a);

}}

Test.java

package org.r4r;


public class Test {


Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);//A a1=(A)f.getBean("a1");@SuppressWarnings("unused")A a2=(A)f.getBean("a2");@SuppressWarnings("unused")A a3=(A)f.getBean("a3");

}

}

OutPut:-

A is instantiated using parameter constructor.Value of a:- 10A is instantiated using Default constructor.Value of A is set by setA() method.Value of a:- 100

16.Dependency on primitive value example

Introduction:-In the case of dependency on primitive value, The constructor-arg is the sub element of <bean ......> is used to specified the dependency of a bean i.e to be satisfied to a constructor this elements uses values and reference attribute which are used to specified value primitive type.



Source Code:-



xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.Dependency on primitive value

examplespringframework.org/schema/beans/spring-beans-2.5.xsd"><bean id="ab" class="org.r4r.A"><constructor-arg value="101" /><constructor-arg value="102" type="int"/></bean>

</beans>

A.java

package org.r4r;

public class A {int a;String b;public A(int a,String b) {

super();this.a=a;this.b =b;System.out.println("Constructor is invoked");

}public void display() {

System.out.println(a+"\t\t"+b);}}

Test.java

package org.r4r;



Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Constructor value are following");A a1=(A)f.getBean("ab");a1.display();

}}

OutPut:-Constructor value are followingConstructor is invoked102 101

17.Dependency on objects example

Introduction:-In the case of Dependency on object, The constructor-arg is the sub element of <bean ......> is used to specify the dependency of an object i.e to be satisfied the constructor-arg element uses reference of an attribute which are used to specify object respectively.



Source Code:-




<bean id="c1" class="org.r4r.Course"><constructor-arg value="MCA"/><constructor-arg value="150000"/></bean><bean id="c2" class="org.r4r.Course"><constructor-arg value="MBA"/><constructor-arg value="250000"/></bean><bean id="ab" class="org.r4r.Student"><constructor-arg value="101"/><constructor-arg value="Mukund"/><constructor-arg><set><ref bean="c1"/><ref bean="c2"/></set></constructor-arg></bean></beans>

Course.java

package org.r4r;

public class Course {String name;int fee;public Course(String name, int fee) {

super();this.name = name;this.fee = fee;

}public String toString(){

StringBuffer b=new StringBuffer();b.append(name).append("\t\t").append(fee);return b.toString();

}

}

Student.java

package org.r4r;

import java.util.Iterator;import java.util.Set;

public class Student {int id;String n;Set<Course> course;

public Student(int id, String n, Set<Course> course) {super();this.id = id;this.n = n;this.course = course;

}

public String toString(){StringBuffer b=new StringBuffer();b.append("Name:").append(n).append("\n").append("Course details\n");Iterator<Course> itr=course.iterator();while(itr.hasNext()){

b.append(itr.next()).append("\n");}return b.toString();

}

}

Test.java

package org.r4r;



Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);Student a1=(Student)f.getBean("ab");System.out.println("Student information is,");System.out.println(a1);

}

}

OutPut:-Student information is,Name:MukundCourse detailsMCA 150000MBA 250000

18.Dependency on collection using List example

Introduction:-In the case of dependency on collection, constructor-arg is the sub element of <bean ......> is used to specify the dependency of a collection i.e to be satisfied the constructor-arg element uses list sub element to specify the dependency of list respectively.



Source Code:-




<bean id="ab" class="org.r4r.Student"><constructor-arg value="101"/><constructor-arg value="Mukund"/><constructor-arg><list><value>Core Java</value><value>J2EE</value><value>Struts</value><value>Hibernate</value><value>Spring</value></list></constructor-arg></bean></beans>

Student.java

package org.r4r;

import java.util.*;public class Student {

int id;String n;List<String> course;

public Student(int id, String n, List<String> course) {super();this.id = id;this.n = n;this.course = course;

}

public String toString(){StringBuffer b=new StringBuffer();

b.append("Name:\t\t").append(n).append("\n").append("Course details:\t\n");Iterator<String> itr=course.iterator();while(itr.hasNext()){


}

}

Test.java

package org.r4r;




}

}

OutPut:-

Student information is,Name: MukundCourse details: Core JavaJ2EEStrutsHibernateSpring

19.Dependency on collection using Set example

Introduction:-In the case of dependency on collection, constructor-arg is the sub element of <bean ......> is used to specify the dependency of a collection i.e to be satisfied the constructor-arg element uses set sub element to specify the dependency of set respectively.



Source Code:-




<bean id="ab" class="org.r4r.Student"><constructor-arg value="101"/><constructor-arg value="Mukund"/><constructor-arg><set><value>Core Java</value><value>J2EE</value><value>Struts</value><value>Hibernate</value><value>Spring</value></set></constructor-arg></bean></beans>

Student.java

package org.r4r;

import java.util.*;public class Student {

int id;String n;Set<String> course;public Student(int id, String n, Set<String> course) {

super();this.id = id;this.n = n;this.course = course;


StringBuffer b=new StringBuffer();b.append("Name:\t\t").append(n).append("\n").append("Course details:\t\n");Iterator<String> itr=course.iterator();while(itr.hasNext()){


}}

Test.java

package org.r4r;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.Resource;



}}

OutPut:-Student information is,Name: MukundCourse details: Core JavaJ2EEStrutsHibernateSpring

20.Dependency on collection using Map example

Introduction:-In the case of dependency on collection, constructor-arg is the sub element of <bean ......> is used to specify the dependency of a collection i.e to be satisfied the constructor-arg element uses MAP sub element to specify the dependency of MAP respectively.



Source Code:-




<bean id="ab" class="org.r4r.Institute"><constructor-arg value="XYZ"/><constructor-arg><map><entry key="MCA" value="150000"/><entry key="MBA" value="250000"/><entry key="BCA" value="50000"/><entry key="BBA" value="100000"/></map>

</constructor-arg></bean>

</beans>

Institute.java

package org.r4r;

import java.util.Iterator;import java.util.Map;import java.util.Set;

public class Institute {String name;Map<String, String> courseDetails;public Institute(String name, Map<String, String> courseDetails) {

super();this.name = name;this.courseDetails = courseDetails;


System.out.println("Name:\t"+name);System.out.println("Course Name\t\tFee");Set<Map.Entry<String, String>> set=courseDetails.entrySet();Iterator<Map.Entry<String, String>> itr=set.iterator();while(itr.hasNext()){

Map.Entry<String, String> m=itr.next();System.out.println(m.getKey()+"\t\t"+m.getValue());

}}

}

Test.java

package org.r4r;



Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Constructor value are following");Institute a1=(Institute)f.getBean("ab");a1.display();

}

}

OutPut:-Constructor value are followingName: XYZCourse Name FeeMCA 150000MBA 250000BCA 50000BBA 100000

21.Setter Injection Dependency using Map example

Introduction:-In the case of dependency on collection using setter injection, property is the sub element of <bean ......> is used to specify the dependency of a collection i.e to be satisfied the property element uses MAP sub element to specify the dependency of MAP respectively.



Source Code:-




<bean id="a1" class="org.r4r.Institute"><property name="name" value="HIMT"/><property name="courseDetail"><map><entry key="MCA" value="75000"/><entry key="MBA" value="175000"/><entry key="BCA" value="50000"/><entry key="BBA" value="50000"/></map></property></bean></beans>

Institute.java

package org.r4r;

import java.util.Iterator;import java.util.Map;


public class Institute {String name;Map<String, String> courseDetail;

public void setName(String name) {this.name = name;

}public void setCourseDetail(Map<String, String> courseDetail) {

this.courseDetail = courseDetail;}public void display(){

System.out.println("Name:-\t"+name);System.out.println("\nCourse Details:-");Set<Map.Entry<String, String>> set=courseDetail.entrySet();Iterator<Map.Entry<String, String>> itr=set.iterator();while(itr.hasNext()){

Map.Entry<String, String> m=itr.next();System.out.println(m.getKey()+"\t"+m.getValue());

}

}}

Test.java

package org.r4r;


public class Test {public static void main(String[] args) {

Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);Institute i=(Institute)f.getBean("a1");i.display();

}}

OutPut:-Name:- HIMTCourse Details:-MCA 75000MBA 175000BCA 50000BBA 50000

22.Autowire in Spring Framework

22.1 .Introduction of an Autowiring:- An autowiring is the facility provided by framework to satisfied by dependency of manage bean without configuration information. It means that the autowiring solved problem to write very long configuration information.

22.2 .Type of method to Autowire:- The following four method are used by IOC container to autowire bean dependency.

1.Autowire by Type

2.Autowire by Name

3.Autowire by Constructor

4.Autowire by autodetect

22.2.1 .Autowire by Type:-In autowiring by type , The IOC container used the bean property by type to identified the beans to be injected i.e in order to used autowiring by type we need to simply configure one bean for each property of the target bean.

Note:- Facility of autowiring are used only with object type dependency i.e primitive dependency are note autowire.

Syntax:-

<bean id="x" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="byType"/>

Disadvantage of Autowire:-

1. Optional dependency are specified using by type because dependency are injected by setter method.

2. Autowiring by type can not be used if there are more than one beans. Configured for a properties type.

22.2.2 .Autowire by Name:-In this case IOC container uses the name of a bean property to fined out the bean for injecting i.e in this approach the configuration bean to be used for satisfied the dependency of the bean must have the same as the bean property.

Syntax:-<bean id="a" class="org.r4r.A"/><bean id="y" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="byName"/>

Disadvantage of Autowire:-

1. Only optional dependency can be autowire for this approach.

2. This approach would work of a bean of different type is configure using the same name as the property of a bean which uses autowiring.

22.2.3 .Autowire by Constructor:-In this approach type of parameter of the constructor are used to identified the bean to be injected in case of overloaded constructed has a maximum parameter will choose.

This approach is same as autowiring by type accept dependency are injected through constructor in it.

Syntax:-

<bean id="a" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="constructor"/>

22.2.4 .Autowire by Autodetect:-This approach is a combination of autowiring by constructor and autowiring by type in it dependency is injected using the type of property if target bean has a default constructor and dependency are injected using constructor injection if target bean has a parameterize constructor.

Note:-This is the default strategy of the autowiring.

<bean id="x" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="autodetect"/>22.3 .Limitation of Autowiring:-Major draw back of autowiring is understandability is loosed

23.Example of Autowire by Name

Introduction:-In the case of Autowire by Name, The IOC container uses the name of a bean property to fined out the bean for injecting i.e in this approach the configuration bean to be used for satisfied the dependency of the bean must have the same bean property.



Source Code:-




<bean id="a" class="org.r4r.A"/><bean id="y" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="byName"/>

</beans>

A.java

package org.r4r;

public class A {

public A() {super();System.out.println("A is instantiated");

}}

B.java

package org.r4r;

public class B {A a;A y;

public B() {super();System.out.println("Default constructor of B is invoked.");

}

public B(A a) {super();this.a = a;System.out.println("Parameterized constructor of B is invoked.");

}

public void setA(A a) {this.a = a;System.out.println("setA() method is invoked typeName a.");

}

public void setY(A y) {this.y = y;System.out.println("setA() method is invoked typeName y.");

}}

Test.java

package org.r4r;


public class Test {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);@SuppressWarnings("unused")B b=(B)f.getBean("b");

}

}

OutPut:-

Default constructor of B is invoked.A is instantiatedA is instantiatedsetA() method is invoked typeName a.setA() method is invoked typeName y.

24.Example of Autowire by Type

Introduction:-In case of autowiring by type , The IOC container used the bean property by type to identified the beans to be injected i.e in order to used autowiring by type we need to simply configure one bean for each property of the target bean.



Source Code:-




<bean id="x" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="byType"/>

</beans>

A.java

package org.r4r;

public class A {


}}

B.java

package org.r4r;

public class B {A a;


}


}

public void setA(A a) {this.a = a;System.out.println("setA() method is invoked.");

}}

Test.java

package org.r4r;


public class Test {public static void main(String[] args) {

Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);@SuppressWarnings("unused")B b=(B)f.getBean("b");

}}

OutPut:-Default constructor of B is invoked.A is instantiatedsetA() method is invoked.

25.Example of Autowire by Constructor

Introduction:-In the case of Autowire by constructor , in this approach type of parameter of the constructor are used to identified the bean to be injected in case of overloaded constructed has a maximum parameter will choose.



Source Code:-




<bean id="a" class="org.r4r.A"/><bean id="b" class="org.r4r.B" autowire="constructor"/></beans>

A.java

package org.r4r;

public class A {


}}

B.java

package org.r4r;



}


}


}

public void setY(A y) {this.y = y;

System.out.println("setA() method is invoked typeName y.");}

}

Test.java

package org.r4r;


public class Test {


}}

OutPut:-

A is instantiatedParameterized constructor of B is invoked.

26.Example of Autowire by Autodetect

Introduction:-In the case of Autowire by Autodetect, this approach is a combination of autowiring by constructor and autowiring by type in it dependency is injected using the type of property if target bean has a default constructor and dependency are injected using constructor injection if target bean has a parameterize constructor.



Source Code:-




<bean id="x" class="org.r4r.A"/>

<bean id="b" class="org.r4r.B" autowire="autodetect"/></beans>

A.java

package org.r4r;

public class A {


}}

B.java

package org.r4r;



}


}


}

public void setY(A y) {this.y = y;System.out.println("setA() method is invoked typeName y.");

}}

Test.java

package org.r4r;


public class Test {


}}

OutPut:-

Default constructor of B is invoked.A is instantiatedsetA() method is invoked typeName a.setA() method is invoked typeName y.

27.Lifecycle management of IOC container

27.1 .Introduction:-The IOC container provide the facility of notifying beans about the creation and destruction show that bean can perform initialization or cleanup perforation. It means that the IOC container provide the facility to notifying create of bean and destroy of bean. Initialization and destruction of a bean is notified to it.

The IOC container notifying the creation and destruction either of the following two way :-

1. Non-Intrusive approach

2. Intrusive approach

27.2 .Non-Intrusive approach:-A non-intrusive approach an initialization method is defined in the bean and is specified in the bean configuration using init-method attribute.

Syntax:-

<bean id="one" class="org.r4r.One" init-method="init"/>

27.3 .Intrusive approach:-In the intrusive approach initialization bean interface provided by the framework is implemented in the bean class and initializing logic is contain with it after property set method. This method is provided by "InitializingBean" interface.

27.3.1 .InitializingBean:- The InitializingBean interface provide cleanup operation at the time of unloading of a bean either destroy-method attribute of bean is used.

This interface provide a method name which are following:-

public void afterPropertiesSet();

Syntax:-

<bean id="one" class="org.r4r.One" destroy-method="init"/>

27.3.2 .DisposableBean:- This bean interface is provided by framework is implemented. This interface provide a method name destroy() if is invoked by IOC container before unload by IOC container before unloaded bean.

This interface provide single method name destroy().

public void destroy();

28.Example of Intrusive approach

Introduction:-This approach provide the facility to initialize the bean through the InitializingBean interface. This interface implement in our bean class then its provide a method name afterPropertiesSet() to override in our bean class.



Source Code:-




<bean id="one" class="org.r4r.One" init-method="init"/><bean id="two" class="org.r4r.Two" init-method="init" destroy-method="cleanUp"/></beans>

One.java

package org.r4r;

import org.springframework.beans.factory.DisposableBean;

public class One implements DisposableBean {

@Overridepublic void destroy() throws Exception {

System.out.println("One is given a chance to performed cleanup operation");

}public One(){

System.out.println("One is instantiated...");}public void init(){

System.out.println("One is given a chance to initialize");}

}

Two.java

package org.r4r;

import org.springframework.beans.factory.InitializingBean;

public class Two implements InitializingBean {

@Overridepublic void afterPropertiesSet() throws Exception {

System.out.println("Intrusive initialization of two");

}public Two(){

System.out.println("Two is instantiated....");}public void init(){

System.out.println("Nonintrunsive initialization of two....");}public void cleanUp(){

System.out.println("Non-intrunsive cleanup of two...");}

}

Test.java

package org.r4r;


public class Test {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining bean one...");One one=(One)f.getBean("one");f.isSingleton("one");

}

}

OutPut:-Obtaining bean one...One is instantiated...

One is given a chance to initializeObtaining bean two...Two is instantiated....Intrusive initialization of twoNonintrunsive initialization of two....

29.Example of Non-Intrusive approach

Introduction:-A non-intrusive approach an initialization method is defined in the bean and is specified in the bean configuration using init-method attribute.



Source Code:-




<bean id="one" class="org.r4r.One" init-method="init"/><bean id="two" class="org.r4r.Two" init-method="init" destroy-method="cleanUp"/></beans>

One.java

package org.r4r;

import org.springframework.beans.factory.DisposableBean;

public class One implements DisposableBean {

@Overridepublic void destroy() throws Exception {

System.out.println("One is given a chance to performed cleanup operation");

}public One(){

System.out.println("One is instantiated...");}public void init(){

System.out.println("One is given a chance to initialize");}

}

Two.java

package org.r4r;

import org.springframework.beans.factory.InitializingBean;

public class Two implements InitializingBean {

@Overridepublic void afterPropertiesSet() throws Exception {

System.out.println("Intrusive initialization of two");

}public Two(){

System.out.println("Two is instantiated....");}public void init(){

System.out.println("Nonintrunsive initialization of two....");}public void cleanUp(){

System.out.println("Non-intrunsive cleanup of two...");}

}

Test.java

package org.r4r;


public class Test {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining bean one...");@SuppressWarnings("unused")One one=(One)f.getBean("one");System.out.println("Obtaining bean two...");@SuppressWarnings("unused")Two two=(Two)f.getBean("two");f.isSingleton("one");//f.isPrototype("two");

}

}

OutPut:-Obtaining bean one...One is instantiated...One is given a chance to initializeObtaining bean two...Two is instantiated....Intrusive initialization of twoNonintrunsive initialization of two....

30.Example of Difference scope bean

Introduction:-In the case of different scope bean BeanFactoryAwar interface provide the facility to give the service one scope to more than one different scope. The BeanFactoryAwar interface provide a method name setBeanFactory() to override in our bean class than solved these problem in the spring framework.



Source Code:-




<bean id="b" class="org.r4r.Burger" scope="prototype"/><bean id="a" class="org.r4r.Attendant" >

</bean></beans>

Burger.java

package org.r4r;

public class Burger {static int burgerCounter;int burgerNo;public Burger(){

burgerCounter++;burgerNo=burgerCounter;System.out.println("New burger is created...");


return "It is burger number:-"+burgerNo;

}

}

Attendant.java

package org.r4r;

import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.BeanFactoryAware;

public class Attendant implements BeanFactoryAware{BeanFactory beanfactory;

/*In this approach same Burger provided by Attendant * Then solved this approach after commented code * Burger burger;

public Attendant(Burger burger) {super();this.burger = Burger;System.out.println("Attendant bean is created...");

}public Burger getBurger(){

return burger;}*/

@Overridepublic void setBeanFactory(BeanFactory beanFactory) throws BeansException {

beanfactory=beanFactory;System.out.println("Reference of IOC container is provided to attendant.");

}public Attendant() {

System.out.println("Attendant bean is created...");}public Burger getBurger(){

return (Burger)beanfactory.getBean("b");}

}

Test.java

package org.r4r;


public class Test {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining attendant bean....");Attendant a=(Attendant)f.getBean("a");System.out.println("Requesting two burger.....");Burger b1=a.getBurger();System.out.println(b1);Burger b2=a.getBurger();System.out.println("Description of second burger...");System.out.println(b2);

}

}

OutPut:-Obtaining attendant bean....Attendant bean is created...Reference of IOC container is provided to attendant.Requesting two burger.....New burger is created...It is burger number:-1New burger is created...Description of second burger...It is burger number:-2

31.Method Injection in Spring Framework

31.1 .Introduction:-Spring 1.1 introducing method injection for a new IOC-Oriented feature with allows greater flexibility for interactions between collaborators.

31.2 .Type of Method Injection:-

The spring framework method injection provide this facility in to two way:-

1.Lookup Method Injection

2.Method replacement

31.3 .Lookup Method Injection:-The lookup method injection provide the facility to implement in our application one bean is depends on another bean with a different life cycle. It means that singleton bean depends on non-singleton bean. In this situation setter and constructor injection create instance of singleton bean not a non-singleton bean. In some case application require singleton bean obtain new instance of the non-singleton every time it requires the bean.

If we achieve this implementation in our application the implement BeanFactoryAware interface in our singleton bean. Then using BeanFactory instance, the singleton bean can lookup a new instance of a non-singleton dependency every time it needs it.

The Lookup Method Injection allows the singleton bean to declare that it requires a non-singleton dependency and receive a new instance of the non-singleton bean each time it needs to interact with it, without needing to implement any spring-specific interfaces.

31.4 .Method Replacement:-This Method injection provide a facility to replace the implementation of any method on a bean arbitrary, without changing our source code.

Note:-If we are use lookup method injection and method replacement in our application, the add the CGLIB jar file in our application.

32.Example of Lookup Method Bean

32.1 .Introduction:-The Lookup Method injection provide a facility to one singleton bean depends on a non-singleton. It means that singleton bean depends on prototype bean.



2.Eclips Id

3.Tomcat Server

4.CGLIB jar file.

32.3 .Source Code:-




<bean id="b" class="org.r4r.Burgar" scope="prototype"/><bean id="na" class="org.r4r.NewAttendant" ><lookup-method bean="b" name="getBurgar"/></bean></beans>

Burgar.java

package org.r4r;

public class Burgar {static int burgarCounter;int burgarNo;public Burgar(){

burgarCounter++;burgarNo=burgarCounter;System.out.println("New burgar is created...");


return "It is burger number:-"+burgarNo;}

}

NewAttendant.java

package org.r4r;

public abstract class NewAttendant {public abstract Burgar getBurgar();

}

Test.java

package org.r4r;


public class Test {

public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining attendent bean....");NewAttendant a=(NewAttendant)f.getBean("na");System.out.println("Requesting two burgar.....");Burgar b1=a.getBurgar();System.out.println(b1);Burgar b2=a.getBurgar();System.out.println("Discription of second burgar...");System.out.println(b2);

}

}

OutPut:-

Obtaining attendent bean....Requesting two burgar.....New burgar is created...It is burger number:-1New burgar is created...Discription of second burgar...It is burger number:-2

33.AOP (Aspect Oriented Programming)

33.1.Introduction:-An Aspect Oriented Programming (AOP) is a programming model that compliments object oriented programming model and provides an efficient mechanism of implementing behaviors which have crosscutting concerns.

33.2.Terminology of AOP:- There are following terminology of AOP (Aspect Oriented Programming) in spring framework:-

1.Concerns:-A concerns represent a task i.e performed as part of an operation. A concerns is set to be crosscutting concerns is it participate of multiple operation.

2.Advice:-Implementation of a concerns is called Advice.

3.Joinpoint:- Joinpoint represent easily identifiable intersection point in the execution of an application where Advices can be inserted. Loading of classes, creation of an object, invocation of method etc. can be used as joinpoint. A spring AOP implementation only support method invocation joinpoint.

5.Pointcut:- A pointcut is a collection of Joinpoint.

6.Aspect:- An Aspect is a collection of Pointcut and Advices.

33.3.What is crosscutting concern in Spring AOP:-

A concern represent a task that is performed as part of an operation. A concern is set to be crosscutting is it participate of multiple operation.

Concerns can be divided in to multiple category such as:-

1.Implementation Concern

2.Business Concern

3.Organization Concern

etc.

1.Implementation Concern:- Implementation Concerns represents those task which are required before implementing for example:-Validation, Authorization, etc

2.Business Concern:- Business concern represent actual logic or main task of an operation.

3.Organization Concern:- Organization concern represent additional services, facility and requirement associated an operation by an organization.

33.4.What is Weaving in Spring AOP:-

The process of inserting advices is called weaving. Different AOP framework supports either weaving types:-

1.Compilation time weaving

2.Runtime weaving

1.Compilation time Weaving:- In Compilation time weaving advices are inserted at the time of Compilation at the special AOP compiler.

Advantage:- The major advantage of this approach are performance.

Disadvantage:- Special AOP compiler are required and application need to be recompile.

2.Runtime Weaving:- In this approach advices are dynamically inserted which the help of proxy object.

Advantage:- Special AOP compiler are not required and Application are not required to be modified or recompile each time . Number of concerns or order changed.

Disadvantage:- Performance are degrade because of additional overhead are proxy.

Note:-A Spring AOP support Runtime weaving.

34.Proxy in Spring Framework

34.1.Introduction:-A proxy is an Object that represents the functionality of an other Object. Proxy are used an abstraction of complex services expose by the Object to another Object in AOP proxy are use to add advices before or after method invocation.

34.2.Type of Proxy in Spring Framework:-

There are two type of Proxy Object in the Spring Framework:-

1.Static Proxy

2.Dynamic Proxy

34.3.Static Proxy:-Static Proxy are created by the developer at the time of development. Static Proxy develop in two way first through the developer and second through the used of any tools for example RMI compiler etc.

34.4.Dynamic Proxy:-Dynamic proxy are created at runtime. It is provided more flexibility.

34.5.Type of Dynamic Proxy:-There are two types of Dynamic Proxy in Spring Framework:-

1.JDK Dynamic Proxy

2.CGLIB Dynamic Proxy

34.6.JDK Dynamic Proxy:-JDK Dynamic Proxy is the facility provided by Sun micro System. In Reflection API to create dynamic proxy can not be created of those classes which implements some interface that is JDK dynamic proxy to implemented those method which are described by this interface implemented by target class.

A JDK Dynamic proxy represent in instance dynamic proxy class which extends java.leng.reflect proxy class implemented by the target class. JDK dynamic proxy uses on Object.

34.7.CGLIB Dynamic Proxy:-CGLIB dynamic proxy is proxy of all the method of class perspective of the interface are implemented by the class.

5.Example of JDK Dynamic Proxy

35.1.Introduction:-JDK dynamic proxy provided by sun micro system through the reflection API to create runtime proxy object then provide the services before invocation of method and after invocation of method.



2.Eclips Id

3.Tomcat Server

35.3 .Source Code:-




</beans>

A.java

package org.r4r;

public class A implements Printable {

@Overridepublic void print() {

System.out.println("print() mathod of A is invoked..");

}}

Printable.java

package org.r4r;

public interface Printable {public void print();

}

PrintHandler.java

package org.r4r;

import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;

public class PrintHandler implements InvocationHandler {

Object target;

public PrintHandler(Object target) {super();this.target = target;

}

@Overridepublic Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {System.out.println("Handler invoked invoking\t"+method.getName()+"() one

target object.....");//advices can be inserted here before actual method call.Object r=method.invoke(target, args);//advices can be inserted here after actual method call.System.out.println("Method call completed, returning value\t"+"return by

actual method");return r;

}

}

ProxyTest.java

package org.r4r;

import java.lang.reflect.Proxy;

public class ProxyTest {

public static void main(String[] args) {try{

System.out.println("Creating target object.....");A target=new A();System.out.println("Creating handler....");PrintHandler handler=new PrintHandler(target);System.out.println("Creating proxy,,,");Printable proxy=(Printable)Proxy.newProxyInstance

(target.getClass().getClassLoader(), target.getClass().getInterfaces(), handler);

System.out.println("invoking print() on proxy.....");proxy.print();

}catch(Exception e){

System.out.println(e);}

}

}

OutPut:-

Creating target object.....Creating handler....

Creating proxy,,,invoking print() on proxy.....Handler invoked invokingprint() one target object.....print() mathod of A is invoked..Method call completed, returning valuereturn by actual method

36.Example of MyFramework AOP Implementation

36.1.Introduction:-An Aspect Oriented Programming (AOP) is a programming model that compliments object oriented programming model and provides an efficient mechanism of implementing behaviors which have crosscutting concerns.



2.Eclips Id

3.Tomcat Server

Note:-In this example take two different package in src folder our Application. First package name is org.r4r.framework and second package name is org.r4r.client.

36.3 .Source Code:-




<bean id="t" class="org.r4r.client.One"/><bean id="a" class="org.r4r.client.BeforeOne"/><bean id="proxy" class="org.r4r.framework.ProxyFactory"><property name="target" ref="t"/><property name="advisor" ref="a"/></bean></beans>

BeforeAdviceHandler.java

package org.r4r.framework;

import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;

public class BeforeAdviceHandler implements InvocationHandler {Object target;BeforeMethod advisor;

public BeforeAdviceHandler(Object target, BeforeMethod advisor) {super();this.target = target;this.advisor = advisor;

}

@Overridepublic Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {advisor.doBefore();return method.invoke(target, args);

}

}

BeforeMethod.java


public interface BeforeMethod {public void doBefore();

}

ProxyFactory.java


import java.lang.reflect.Proxy;

import org.springframework.beans.factory.FactoryBean;

public class ProxyFactory implements FactoryBean {Object target;BeforeMethod advisor;

@Overridepublic Object getObject() throws Exception {

BeforeAdviceHandler handler=new BeforeAdviceHandler(target, advisor);Object proxy=Proxy.newProxyInstance

(target.getClass().getClassLoader(), target.getClass().getInterfaces(), handler);

return proxy;}

@Overridepublic Class<Proxy> getObjectType() {

return Proxy.class;}

@Overridepublic boolean isSingleton() {

return true;}public void setTarget(Object target) {

this.target = target;}

public void setAdvisor(BeforeMethod advisor) {this.advisor = advisor;

}

}

One.java

package org.r4r.client;

public class One implements Showable {

@Overridepublic void show() {

System.out.println("Show() method of One invoked..");

}

}

Showable.java


public interface Showable {public abstract void show();

}

BeforeOne.java


import org.r4r.framework.BeforeMethod;

public class BeforeOne implements BeforeMethod {

@Overridepublic void doBefore() {

System.out.println("Before advice is applied.");

}

}

ProxyTest.java




public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining proxy of one..");Showable p=(Showable)f.getBean("proxy");System.out.println("Proxy obtaining invoked.");p.show();

}

}

OutPut:-Obtaining proxy of one..Proxy obtaining invoked.Before advice is applied.Show() method of One invoked..

37.Advices in Spring Framework

37.1.Introduction:-Implementation of a concerns is called Advice. It means that concerns represent a task i.e performed as part of an operation. Any operation are implemented through the concern is called Advices.

37.2.Type of Advices in Spring Framework:-There are four type of advices in spring framework which are following

1.Before Advice

2.After Advice

3.Around Advice

4.After Throws Advice

37.3.Before Advice:-This Spring Before advice provide the service before invoking the method. It means that Before advices represent those concern which are to be applied before a method is invoked. Which are applied in Validation, Authorization, etc. are the task which can be implemented using before advice.

Framework provide an interface named "MethodBeforeAdvice" this interface provide a method that is used by application developer to define the task that are to be executed before the invocation target method.

37.4.After Advice:-After advice represents those task which are to be performed after the completion of method. A Spring Framework implements After Advice are invoked from the implementation of AfterReturningAdvice interface.

This interface provide a method name AfterReturning which is invoked InvocationHandler after the actual method completed. Through this method reference of target method, argument, method object and value returned by the Object are provided to the developer. Application developer may used the return value but can not change it.

37.5.Around Advice:-An around advice are used when some operations are to be performed before and after method call and controlled over the return value of the method is to be gain.

To apply around advice implementation of "MethodInterceptor" interface need to be provided by the developer. This interface provide a method name invoke which received parameter of type of Invocation. MethodInvocation Object encapsulate invocation of the actual method of the target object and exposes the method name proceed() which is used by application developer to get the actual method invoked.

38.6.After Throws Advice:-An after throws advice is used to performed some operation between throwing and catching an exception.

To implements after throws advice implementation of "ThrowsAdvice" interface need to be provided. It is the marker interface. The class which implements this interface can define a method name afterThrowing() which can have either of the following signature.

public void afterThrowing(Exception e);

public void afterThrowing(Methid m, Object[] arg, Object target);

38.Example of Before Advice

38.Introduction:-This Spring Before advice provide the service before invoking the method. It means that Before advices represent those concern which are to be applied before a method is invoked. Which are applied in Validation, Authorization, etc. are the task which can be implemented using before advice.



2.Eclips Id

3.Tomcat Server

38.3 .Source Code:-



xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"

xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="t" class="org.r4r.One"/><bean id="a1" class="org.r4r.BeforeAdvisor"/><bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="target" ref="t"/><property name="interceptorNames"><list><value>a1</value></list></property></bean>

</beans>

Showable.java

package org.r4r;


}

BeforeAdvisor.java

package org.r4r;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class BeforeAdvisor implements MethodBeforeAdvice {

@Overridepublic void before(Method arg0, Object[] arg1, Object arg2)

throws Throwable {System.out.println("Before advice is applied..");

}

}

One.java

package org.r4r;




}

}

ProxyTest.java

package org.r4r;




}

}

OutPut:-Obtaining proxy of one..Proxy obtaining invoked.Before advice is applied..Show() method of One invoked..

39.Example of After Advice

39.1.Introduction:-After advice represents those task which are to be performed after the completion of method. A Spring Framework implements After Advice are invoked from the implementation of AfterReturningAdvice interface.



2.Eclips Id

3.Tomcat Server

39.3 .Source Code:-



xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<bean id="t" class="org.r4r.One"/><bean id="a1" class="org.r4r.BeforeAdvisor"/><bean id="a2" class="org.r4r.AfterAdvisor"/><bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="target" ref="t"/><property name="interceptorNames"><list><value>a1</value><value>a2</value></list></property></bean>

</beans>

Showable.java

package org.r4r;


}

One.java

package org.r4r;




}

}

BeforeAdvisor.java

package org.r4r;





throws Throwable {

System.out.println("Before advice is applied..");

}

}

AfterAdvisor.java

package org.r4r;


import org.springframework.aop.AfterReturningAdvice;

public class AfterAdvisor implements AfterReturningAdvice {

@Overridepublic void afterReturning(Object arg0, Method arg1, Object[] arg2,

Object arg3) throws Throwable {System.out.println("After advisor is provide service..");

}

}

ProxyTest.java

package org.r4r;




}

}

OutPut:-Obtaining proxy of one..Proxy obtaining invoked.Before advice is applied..Show() method of One invoked..After advisor is provide service..

40.Example of Around Advice

40.1.Introduction:-An around advice are used when some operations are to be performed before and after method call and controlled over the return value of the method is to be gain.



2.Eclips Id

3.Tomcat Server

40.3 .Source Code:-




<bean id="t" class="org.r4r.One"/><bean id="a1" class="org.r4r.AroundAdviser" /><bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="target" ref="t"/><property name="interceptorNames"><list><value>a1</value></list></property></bean>

</beans>

Showable.java

package org.r4r;


}

One.java

package org.r4r;


@Override

public void show() {System.out.println("Show() method of One invoked..");

}

}

AroundAdviser.java

package org.r4r;

import org.aopalliance.intercept.MethodInterceptor;import org.aopalliance.intercept.MethodInvocation;

public class AroundAdviser implements MethodInterceptor {

@Overridepublic Object invoke(MethodInvocation mi) throws Throwable {

System.out.println("Before advice is applied...");Object temp=mi.proceed();System.out.println("After advice is applied, "+temp+"\tis return by the

method.");System.out.println("Returning failure from the advice");return "failure";

}

}

ProxyTest.java

package org.r4r;




}

}

OutPut:-Obtaining proxy of one..Proxy obtaining invoked.Before advice is applied...

Show() method of One invoked..After advice is applied, null is return by the method.Returning failure from the advice

41.Example of After Throws Advice

41.1.Introduction:-An after throws advice is used to performed some operation between throwing and catching an exception.



2.Eclips Id

3.Tomcat Server

41.3 .Source Code:-




<bean id="t" class="org.r4r.One"/>

<bean id="a2" class="org.r4r.ThrowAdvisor" /><bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="target" ref="t"/><property name="interceptorNames"><list><value>a2</value></list></property></bean>

</beans>

Showable.java

package org.r4r;

public interface Showable {

String show(int x);

}

One.java

package org.r4r;


@Overridepublic String show(int x){

if(x>0){System.out.println("Show() of one invoked returning success");return "success";

}else{

System.out.println("Shows() of one invoked, throwing exception");throw(new IllegalArgumentException("It is thrown by show()"));

}}

}

ThrowAdvisor.java

package org.r4r;


import org.springframework.aop.ThrowsAdvice;

public class ThrowAdvisor implements ThrowsAdvice {/*public void afterThrowing(Exception e){

System.out.println("In throws advice because of following exception"+e);}*/public void afterThrowing(Method m,Object args[],Object target,Exception e){

System.out.println("In throws advice because"+m.getName()+"() throw following exception "+e.getMessage()+" When invoked on the object of "+target.getClass().getName()+"

Class.");}

}

AroundAdviser.java

package org.r4r;

import org.aopalliance.intercept.MethodInterceptor;import org.aopalliance.intercept.MethodInvocation;

public class AroundAdviser implements MethodInterceptor {

@Overridepublic Object invoke(MethodInvocation mi) throws Throwable {

System.out.println("Before advice is applied...");Object temp=mi.proceed();

System.out.println("After advice is applied, "+temp+"\tis return by the method.");

System.out.println("Returning failure from the advice");return "failure";

}

}

ProxyTest.java

package org.r4r;



public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);System.out.println("Obtaining proxy of one..");Showable p=(Showable)f.getBean("proxy");try{

System.out.println("proxy obtained invoking show() with positive value");

String s=p.show(5);System.out.println(s+" Is received by the client");System.out.println("Invoking show() with negative value");p.show(-2);

}catch(Exception e){System.out.println("Following exception caught in main"+e);

}}

}

OutPut:-Obtaining proxy of one..proxy obtained invoking show() with positive valueShow() of one invoked returning successsuccess Is received by the clientInvoking show() with negative valueShows() of one invoked, throwing exceptionIn throws advice becauseshow() throw following exception It is thrown by show() When invoked on the object of org.r4r.One Class.Following exception caught in mainjava.lang.IllegalArgumentException: It is thrown by show()

42.Pointcut in Spring

42.1.Introduction:-By simply specify advices with bean in the configuration all the method of the bean are advice some time final control is required over the application of advices i.e an application developer may want applied some advices only to the selected method to the bean.

Final control over the application of advices is provided by pointcuts. A pointcut is used by the IOC container to find out wither an advice can be applied or not. Framework provide different implementation of pointcut most commonly used implementation of which.

42.2.NameMatchMethodPointcut:-This pointcut implementation uses method name as criteria of finding out the applicability of advices.

The pointcut simply specify a which method of a bean can be advice is does not specified the advices. Advices are associated to pointcut with the help of aspect implementation of aspect is called advisor in Spring AOP implementation framework provide predefine advisor. Most commonly used one these are before pointcut advisor.

Following application demonstrate an user of pointcut or advisor to apply advises of selective method of bean.

42.3.NameMatchMethodPointcutAdvice:-One of the disadvantage of using pointcuts is entry of configuration information solution of this problem is provided by PointcutAdvisor class.

A PointcutAdvisor class combined the functionality of a pointcut and advisor in to a single unit.

The NameMatchMethodPointcutAdvisor class combined the functionality of NameMatchMethodPointcut and DefaultPointcutAdvisor using this class the configuration information is reduced as follows.

43.Example of NameMatchMethodPointcut

43.1.Introduction:-This pointcut implementation uses method name as criteria of finding out the applicability of advices. The pointcut simply specify a which method of a bean can be advice is does not specified the advices. Advices are associated to pointcut with the help of aspect implementation of aspect is called advisor in Spring AOP implementation framework provide predefine advisor. Most commonly used one these are before pointcut advisor.



2.Eclips Id

3.Tomcat Server

41.3 .Source Code:-




<bean id="t" class="org.r4r.One"/><bean id="a1" class="org.r4r.BeforeAdvisor"/>

<bean id="a2" class="org.r4r.AfterAdvisor"/><bean id="pc1" class="org.springframework.aop.support.NameMatchMethodPointcut"><property name="mappedName" value="a"/></bean><bean id="pc2" class="org.springframework.aop.support.NameMatchMethodPointcut"><property name="mappedName" value="b"/></bean><bean id="ad1" class="org.springframework.aop.support.DefaultPointcutAdvisor"><property name="advice" ref="a1"/><property name="pointcut" ref="pc1"/></bean><bean id="ad2" class="org.springframework.aop.support.DefaultPointcutAdvisor"><property name="advice" ref="a2"/><property name="pointcut" ref="pc2"/></bean><bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="target" ref="t"/><property name="interceptorNames"><list><value>ad1</value><value>ad2</value></list></property></bean></beans>

AB.java

package org.r4r;

public interface AB {public void a();public void b();

}

One.java

package org.r4r;

public class One implements AB {

@Overridepublic void a() {System.out.println("a() of one invoked");

}

@Overridepublic void b() {

System.out.println("b() of one invoked");

}

}

AfterAdvisor.java

package org.r4r;






}

}

BeforeAdvisor.java

package org.r4r;






}

}

ProxyTest.java

package org.r4r;



public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);AB proxy=(AB)f.getBean("proxy");System.out.println("Proxy obtained invoking a().");

proxy.a();System.out.println("Proxy obtained invoking b()");proxy.b();

}

}

OutPut:-

Proxy obtained invoking a().Before advice is applied..a() of one invokedProxy obtained invoking b()b() of one invokedAfter advisor is provide service..

44.Example of NameMatchMethodPointcutAdvice

44.1.Introduction:-One of the disadvantage of using pointcuts is entry of configuration information solution of this problem is provided by PointcutAdvisor class.

A PointcutAdvisor class combined the functionality of a pointcut and advisor in to a single unit.

The NameMatchMethodPointcutAdvisor class combined the functionality of NameMatchMethodPointcut and DefaultPointcutAdvisor using this class the configuration information is reduced as follows.



2.Eclips Id

3.Tomcat Server

41.3 .Source Code:-




<bean id="t" class="org.r4r.One"/><bean id="a1" class="org.r4r.BeforeAdvisor"/><bean id="a2" class="org.r4r.AfterAdvisor"/><bean id="pca1" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor"><property name="advice" ref="a1"/>

<property name="mappedName" value="a"/></bean><bean id="pca2" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor"><property name="advice" ref="a2"/><property name="mappedName" value="b"/></bean><bean id="proxy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="target" ref="t"/><property name="interceptorNames"><list><value>pca1</value><value>pca2</value></list></property></bean>

</beans>

AB.java

package org.r4r;

public interface AB {public void a();public void b();

}

One.java

package org.r4r;

public class One implements AB {

@Overridepublic void a() {System.out.println("a() of one invoked");

}

@Overridepublic void b() {

System.out.println("b() of one invoked");

}

}

BeforeAdvisor.java

package org.r4r;






}

}

AfterAdvisor.java

package org.r4r;






}

}

ProxyTest.java

package org.r4r;



public static void main(String[] args) {Resource r=new ClassPathResource("applicationContext.xml");BeanFactory f=new XmlBeanFactory(r);AB proxy=(AB)f.getBean("proxy");System.out.println("Proxy obtained invoking a().");proxy.a();System.out.println("Proxy obtained invoking b()");proxy.b();

}NameMatchMethodPointcut.shtml

}

OutPut:-

Proxy obtained invoking a().Before advice is applied..a() of one invokedProxy obtained invoking b()b() of one invokedAfter advisor is provide service..

45.Template Design Pattern in Spring

45.1.Introduction:-Template is a behavior design pattern i.e used to implement such method which invoked predefine sequence of steps. Implementation some of all the steps can be varies but that sequence can not be varies but that sequence can not be change.

Database operation implemented by JDBC are the candidate for template design pattern because each database operation as following steps:-

1.Connection is created / obtained.

2.Statement is created.

3.Query is Executed

4.Connection close

This sequence can not be altered but individual steps can be implemented in multiple ways.

Example:-

1.Connection can be created using DriverManager, It can be obtained from a pool or can be obtained from a directory server.

2.Statement can be created in multiple ways using Statement, PreparedStatement and CallableStatement interface.

3.Usualy method which involves the predefine sequence of steps out of which some step can be varies are implemented in such a way that common steps are repeated in multiple implementation.

4.Template design pattern tries to be remove this problem to facilities definition of common steps only one in a template method and by allowing individual develop to provide the own implementation to the variable steps following example demonstrate the concept of template design pattern.

//This is a template method that facilitate of two number can be read from the keyboard from a file or from the network. Result can be displayed on the console, can be saved to a file or can be sent over the network i.e out of these steps two are variable.

http://r4r.co.in/java/spring/basic/tutorial/spring2.5/NameMatchMethodPointcut.shtml

abstract class Adder

{

public void add()//template method that uses method steps to define the sequence

{

int numArray[]=getNumber();

int result=numArray[0]+numArray[1];

manageResult(result);

}

public abstract int[] getNumber();//stub method representing.

public void manageResult(int r);//variable step.

}

46.Without using template insert, update, delete and select data Example

46.1.Introduction:-This example provide the difference between template design pattern and simple design pattern to insert , update, delete and select all data from the data base.



2.Eclips Id

3.Tomcat Server

46.3 .Source Code:-

ConnectionProvider.java

package org.r4r;

import java.sql.Connection;import java.sql.DriverManager;

public class ConnectionProvider {public static Connection getConnection(){

Connection con=null;

try{Class.forName("com.mysql.jdbc.Driver");

con=DriverManager.getConnection("jdbc:mysql://localhost/tableone","root","root");}catch(Exception e){

System.out.println(e);}return con;

}

}

Emp.java

package org.r4r;


public Emp() {super();// TODO Auto-generated constructor stub

}public Emp(int id, String name, String job, int salary) {

super();this.id = id;this.name = name;this.job = job;this.salary = salary;









this.salary = salary;}

}

EmpDao.java

package org.r4r;

import java.sql.*;import java.util.Scanner;

public class EmpDao {public void save(Emp emp){

try{Connection con=ConnectionProvider.getConnection();PreparedStatement stmt=con.prepareStatement("insert into emp

values(?,?,?,?)");stmt.setInt(1, emp.getId());stmt.setString(2, emp.getName());stmt.setString(3, emp.getJob());stmt.setInt(4, emp.getSalary());stmt.executeUpdate();con.close();

}catch(Exception e){System.out.println(e);

}

}public void update(Emp emp){

try{Connection con=ConnectionProvider.getConnection();Scanner in=new Scanner(System.in);System.out.println("Enter the id:");

int id=in.nextInt(); in.nextLine();

System.out.println("Enter the name:"); String name=in.nextLine(); System.out.println("Enter the job:"); String job=in.nextLine(); System.out.println("Enter the salary:"); int salary=in.nextInt(); in.nextLine();

PreparedStatement stmt=con.prepareStatement("update emp set name=?, job=?, salary=? where id=?");

stmt.setInt(4, id);stmt.setString(1, name);stmt.setString(2, job);stmt.setInt(3, salary);stmt.executeUpdate();con.close();


}

}public void delete(Emp emp){

try{Connection con=ConnectionProvider.getConnection();

Scanner in=new Scanner(System.in);System.out.println("Enter the id:");

int id=in.nextInt(); PreparedStatement stmt=con.prepareStatement("delete from emp where id=?");

stmt.setInt(1, id);stmt.executeUpdate();con.close();


}

}

}

InsertTest.java

package org.r4r;



public static void main(String[] args) {Scanner in=new Scanner(System.in);EmpDao dao=new EmpDao();while(true){System.out.println("Enter the id:");

int id=in.nextInt(); in.nextLine(); System.out.println("Enter the name:"); String name=in.nextLine(); System.out.println("Enter the job:"); String job=in.nextLine(); System.out.println("Enter the salary:"); int salary=in.nextInt(); in.nextLine(); Emp emp=new Emp(id,name,job,salary); dao.save(emp); System.out.println("Insert continue write yes/no:"); String reg=in.nextLine(); if(reg.equals("no")) break;

}System.out.println("You are successfully insert data...");

}}

UpdateTest.java

package org.r4r;

public class UpdateTest {


System.out.println("Update Emp Object.....");EmpDao dao=new EmpDao();Emp emp=new Emp();dao.update(emp);System.out.println("You are successfully update");

}

}

DeleteTest.java

package org.r4r;

public class DeleteTest {

public static void main(String[] args) {System.out.println("Deleted Emp Object.....");EmpDao dao=new EmpDao();Emp emp=new Emp();dao.delete(emp);System.out.println("You are successfully delete");

}

}

OutPut:-

InsertTest

Enter the id:1005Enter the name:Mukund SinghEnter the job:Java DeveloperEnter the salary:25000Insert continue write yes/no:noYou are successfully insert data...

UpdateTest

Update Emp Object.....Enter the id:1005Enter the name:Bal MukundEnter the job:Spring DeveloEnter the salary:30000You are successfully update

DeleteTest

Deleted Emp Object.....Enter the id:1005You are successfully delete

47.Insert,update,delete and select data using Spring Template

47.1.Introduction:-This example provide the facility to insert, update, delete and fetch data using spring template design pattern then provide connect to JDBC.



2.Eclips Id

3.Tomcat Server

46.3 .Source Code:-

ConnectionProvider.java



<bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://localhost/tableone"/><property name="username" value="root"/><property name="password" value="root"/></bean>

<bean id="temp" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="ds"/></bean>

<bean id="dao" class="org.r4r.EmpTemplateDao"><property name="template" ref="temp"/></bean>

</beans>

Emp.java

package org.r4r;

public class Emp {

http://r4r.co.in/java/spring/basic/tutorial/spring2.5/withoutTemplate.shtml

int id;String name,job;int salary;


}public Emp(int id, String name, String job, int salary) {

super();this.id = id;this.name = name;this.job = job;this.salary = salary;









this.salary = salary;}

}

EmpTemplateDao.java

package org.r4r;

import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import java.util.Scanner;

import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.PreparedStatementCreator;import org.springframework.jdbc.core.RowMapper;

public class EmpTemplateDao {JdbcTemplate template;public JdbcTemplate getTemplate() {

return template;}public void setTemplate(JdbcTemplate template) {

this.template = template;}@SuppressWarnings("unchecked")public List getAllEmp(){

RowMapper mapper=new RowMapper() {

@Overridepublic Object mapRow(ResultSet rset, int index) throws

SQLException {Emp e=new Emp();e.setId(rset.getInt(1));e.setName(rset.getString(2));e.setJob(rset.getString(3));e.setSalary(rset.getInt(4));return e;

}};return template.query("select * from emp", mapper);

}public void save(final Emp e){

PreparedStatementCreator psc=new PreparedStatementCreator() {

@Overridepublic PreparedStatement createPreparedStatement(Connection

con)throws SQLException {

PreparedStatement stmt=null;try{

stmt=con.prepareStatement("insert into Emp values(?,?,?,?)");

stmt.setInt(1, e.getId());stmt.setString(2, e.getName());stmt.setString(3,e.getJob());stmt.setInt(4, e.getSalary());

}catch(Exception ex){System.out.println(ex);

}

return stmt;}

};template.update(psc);

}public void update(final Emp e){





Scanner in=new Scanner(System.in);

System.out.println("Enter the id: ");int id=in.nextInt();stmt=con.prepareStatement

("update emp set name=?,job=?,salary=? where id=?");stmt.setInt(4, id);stmt.setString(1, e.getName());stmt.setString(2, e.getJob());stmt.setInt(3, e.getSalary());


}return stmt;

}};template.update(psc);

}public void delete(final Emp e){





Scanner in=new Scanner(System.in);System.out.println("Enter the id: ");int id=in.nextInt();stmt=con.prepareStatement("delete from emp

where id=?");stmt.setInt(1, id);


}return stmt;

}};template.update(psc);

}

}

InsertTest.java

package org.r4r;

import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;


public static void main(String[] args) {ApplicationContext ctx=new

ClassPathXmlApplicationContext("applicationContext.xml");System.out.println("Obtaining dao from IOC container");EmpTemplateDao dao=(EmpTemplateDao)ctx.getBean("dao");

System.out.println("Dao saved the Emp Object");Emp e1=new Emp(101,"Amit","Engineer",25000);Emp e2=new Emp(102,"ArshRaj","Developer",25000);Emp e3=new Emp(103,"Dipu","Business Man",25000);Emp e4=new Emp(104,"Amar","Marketing Manager",25000);dao.save(e1);dao.save(e2);dao.save(e3);dao.save(e4);System.out.println("Emp object Save");

}

}

UpdateTest.java

package org.r4r;


public class UpdateTest {


ClassPathXmlApplicationContext("applicationContext.xml");System.out.println("Obtaining dao from IOC container");EmpTemplateDao dao=(EmpTemplateDao)ctx.getBean("dao");System.out.println("Dao update the Emp Object");Emp e=new Emp(222,"Mukund Singh","Software Engineer",55000);dao.update(e);System.out.println("Emp object Update");

}

}

DeleteTest.java

package org.r4r;


public class DeleteTest {


ClassPathXmlApplicationContext("applicationContext.xml");System.out.println("Obtaining dao from IOC container");EmpTemplateDao dao=(EmpTemplateDao)ctx.getBean("dao");System.out.println("Deleting Emp Object");Emp e=new Emp();dao.delete(e);System.out.println("Emp object delete");

}

}

SelectTest.java

package org.r4r;

import java.util.*;


public class SelectTest {


ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");

System.out.println("Obtaining dao from IOC container");EmpTemplateDao dao=(EmpTemplateDao)ctx.getBean("dao");System.out.println("Fetching Emp Objects");List<Emp> list=dao.getAllEmp();Iterator<Emp> itr=list.iterator();System.out.println("Following objects are fetched.");while(itr.hasNext()){

Emp e=itr.next();System.out.println(e.getId()+"\t"+e.getName()+"\t"+e.getJob()+"\

t"+e.getSalary());}

}

}

OutPut:-

InsertTest Result

Obtaining dao from IOC containerDao saved the Emp ObjectEmp object SaveUpdateTest Result:-Obtaining dao from IOC containerDao update the Emp ObjectEnter the id: 102Emp object UpdateDeleteTest Result:-Obtaining dao from IOC containerDeleting Emp ObjectEnter the id: 102Emp object deleteSelectTest Result:-Obtaining dao from IOC containerFetching Emp ObjectsFollowing objects are fetched.

103 Amar Marketing 25000101 ArshRaj Develo 25000100 Amit Engi 25000

48.Spring MVC Implementation

48.1.Introduction:-In Spring MVC implementation the controller is an application component. Which is responsible for processing the request. It does not controlled the workflow of request processing as done by struts controller.

Workflow of request is controlled by front controller which is implemented by servlet name "DispatcherServlet" is provides a single entry point in to the application.

48.2.Model View Controller (MVC):-

Model:-Model component represent a data for spring MVC usually a map of model object is used as Model component.

View:-View is a generic component of the framework which is responsible for presenting data to the end user. Multiple implementation of view are provided the framework to support different presentation technique.

Controller:-Controller component provide the facility to change the state and flow the data. Controller component is responsible for the controlled the workflow of the web application in the spring framework.

48.3.How can implement spring MVC:-

Following steps are required to used spring MVC implementation:-

Step 1:-First select the web project in our IDE and add the capability of spring framework (it means that add the jar file). The following jar file are add before implement the spring MVC application

1.Spring 2.5 core Library

2.Spring 2.5 web Library

Step 2:-Servlet entry is to be made in web.xml file for DispatcherServlet class

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>login</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> </servlet> <servlet-mapping>

<servlet-name>login</servlet-name> <url-pattern>*.spring</url-pattern> </servlet-mapping></web-app>Step 3:-Define in xml file to specified a mapping requested url and controller of spring application. This file is conventionally name as follows Example:-ServletName-servlet.xmlStep 4:-If DispatcherServlet is assign "frontController" name in web.xml then this file must be named as"frontController-servlet.xml" Step 5:-The file "frontController-servlet.xml" used the bean element to mapped request url and controller ClassExample:



<bean id="datasource" class="org.apache.commons.dbcp.BasicDataSource"><property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property><property name="url"><value>jdbc:mysql://localhost/tableone</value></property><property name="username"><value>root</value></property><property name="password"><value>root</value></property></bean>

<bean id="jdbcTemp" class="org.springframework.jdbc.core.JdbcTemplate"><constructor-arg><ref local="datasource"/></constructor-arg></bean>

<bean id="loginModel" class="org.r4r.LoginModel"/>Step 6:-Define controller class , Controller is a subclass of AbstractController class. AbstractController class provides anabstract method name handleRequestInternal(HttpServletRequest request,HttpServletResponse response);

which is invoked each time a request of the controller received. This method returned a ModelAndView object.

9.Example of Spring MVC Implementation

49.1.Introduction:-In Spring MVC implementation the controller is an application component. Which is responsible for processing the request. It does not controlled the workflow of request processing as done by struts controller.

Workflow of request is controlled by front controller which is implemented by servlet name "DispatcherServlet" is provides a single entry point in to the application.



2.Eclips Id

3.Tomcat Server

49.3 .Source Code:-

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>frontController</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>frontController</servlet-name> <url-pattern>*.bean</url-pattern> </servlet-mapping></web-app>

frontController.xml



<bean name="/first.bean" class="org.r4r.SecondControlleer"></bean></beans>

MyView.java

package org.r4r;

import java.io.PrintWriter;import java.util.Map;

import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.View;

public class MyView implements View {

public String getContentType() {

return "text/html";}

@SuppressWarnings("unchecked")public void render(Map model, HttpServletRequest request,

HttpServletResponse response) throws Exception {PrintWriter out=response.getWriter();out.println("This view is generated by spring view....");out.println("First Name:-\t"+model.get("firstName"));out.println("Last Name:-\t"+model.get("lastName"));out.close();

}

}

FirstController.java

package org.r4r;

import java.util.HashMap;import java.util.Map;


import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;

public class FirstController extends AbstractController {

@Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request,

HttpServletResponse response) throws Exception {Map<String, String> map=new HashMap<String, String>();map.put("firstName", "Mukund");map.put("lastName", "Singh");

ModelAndView mav=new ModelAndView(new MyView(),map);return mav;

}

}

index.jsp

<a href="first.bean">My First Spring MVC</a><br/>

OutPut:-

50.Example of Spring MVC ViewResolver

50.1.Introduction:-In the Spring framework provide the facility to view the result in front of User through the "InternalResourceViewResolver" class. The Spring framework provide this class to present the information which processing after the controller of the Spring MVC pattern.



2.Eclips Id

3.Tomcat Server

50.3 .Source Code:-

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>frontController</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>frontController</servlet-name> <url-pattern>*.bean</url-pattern> </servlet-mapping></web-app>

frontController-servlet.xml



<bean id="viewResolver"class=" org.springframework.web.servlet.view.InternalResourceViewResolver" ><property name="prefix" value="/"/><property name="suffix" value=".jsp"/></bean><bean name="/first.bean" class="org.r4r.FirstController"><property name="message" value="My Name Is MUKUND"></property></bean>

</beans>

SecondController.java

package org.r4r;


import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;

public class FirstController extends AbstractController {private String message;

@Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request,

HttpServletResponse response) throws Exception {// TODO Auto-generated method stubreturn new ModelAndView("welcomePage","welcomeMessage",message);

}


}


}

}

index.jsp

<a href="first.bean">First Controller</a>

welcomePage.jsp

<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Welcome Page</title></head><body>${welcomeMessage}</body></html>

OutPut:-

51.How can integrate Struts 2.x and Spring Framework

51.1.Introduction:-The Struts 2.x is the web application framework in Java Technology, this framework provide the concept of Model View Controller (MVC) and Interceptor to develop the web application. The Spring framework provide the facility to integrate with other framework and Developed the application in java. This tutorial provide the facility how can integrate between Spring framework and Struts 2.x .

51.2.How can integrate Spring framework and Struts 2.x:-

Following steps are required to integrate Spring framework and Struts 2.x framework:-

Step 1:-First select the web project in our IDE and add the capability of spring 2.5 and Struts 2.x (it means that add the jar file ).

Step 2:-Also add struts2-spring-plugin-2.0.jar file.

Step 3:-Create configuration file struts.xml in src folder to give the struts configuration information.

Step 4:-Also create applicationContext.xml in WEB-INF folder to give the spring configuration information.

Step 5:-Create Action class to send the string of controller class to invoked the jsp page.

Step 6:-Mapped the ContextLoaderListener class in web.xml file.

52.Example of Struts 2.x ,Spring 2.5 integration

52.1.Introduction:-This tutorial provide the example to integrate between struts2 and spring framework.



2.Eclips Id

3.Tomcat Server

52.3 .Source Code:-

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Struts2Example14</display-name> <filter>

<filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter><listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener><filter-mapping>

<filter-name>struts2</filter-name><url-pattern>/*</url-pattern>

</filter-mapping><welcome-file-list>

<welcome-file>index.jsp</welcome-file></welcome-file-list>

</web-app>


<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans> <bean id="helloWorldClass" class="org.r4r.HelloWorld" > </bean></beans>

struts.xml

<!DOCTYPE struts PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd">

<struts> <package name="default" extends="struts-default"> <action name="helloWorld" class="helloWorldClass"> <result name="success">/success.jsp</result> </action> </package></struts>

HelloWorld.java

package org.r4r;

public class HelloWorld {

private String message;


}


}

public String execute() { return "success"; }}

index.jsp

<%@taglib uri="/struts-tags" prefix="s"%><s:form action="helloWorld"><s:textfield name="message" label="Name"></s:textfield><s:submit></s:submit></s:form>

success.jsp

<%@taglib uri="/struts-tags" prefix="s"%>

Welcome, <s:property value="message"/>

OutPut:-

Documents

Very Important Example of Hibernate3.0