สปริ�ง เฟริมเวิ�ริ�ค เวิ�ริ�คชอป(Spring Framework Workshop)

By www.spring66.comพฤศจิ�กายน 2552, 22

ชั�ดเจิน “เขี�ยนจาวิาไม�ใช�สปริ�ง บาป”

Supported by KT ZMICO Securities

@roofimon ขีอ ขีอบค�ณ TA• ไม่�ม่� TA ไม่�ม่�งานน��ครั�บ

– @somkiat– @9tae– @poorprogrammer– @nuboat– @siros_s– @YashimaExteen– @boyone

• TA เป็�นผู้��ทรังค�ณวุ�ฒิ�เรั"#องสป็รั�งท�กท�าน

Agenda

• Impossible is nothing• Why Spring?• New Features and Enhancements in

Spring 3.0 – Core Container 3.0– Persistence with Spring JDBC– AOP (@siros_s)– Transaction with Annotation (@siros_s)– EhCache (Apply AOP)– Spring Web MVC with Web Annotation

Basic Requirements • JDK 1.6 ++• Maven 2.0.x• Apache Derby• Netbeans, Eclipse, Vi, Whatever IDE• Skeleton Source from

– http://code.google.com/p/spring66-training-3/svn/branches/1.0.PRE

• Full– https://spring66-training-

3.googlecode.com/svn/trunk/

ที่��มาขีองเน��อหา(ลอกมาจากไหน)• Building Spring2 Enterprise Application• Development J2EE without EJB• Professional Spring Framework• Spring2 in Action• Pro Spring2• Spring Recipe• หน�งส"ออ�างอ�งเยอะม่าก

ที่#าไมต้�องสปริ�ง เม��อก�อน• Java เตรั�ยม่เครั"#องม่"อไวุ�ให�เยอะไป็หม่ดแต�เวุลาใชั� ? • Design Pattern: ต�องน�#งต�ควุาม่เอาเอง• กรัะบวุนการัรัวุม่ฟี-เจิอรั.ของ SUN โหดรั�ายเก�นไป็• ชั�วุ�ตเรัาถู�กผู้�กต�ดก�บ Application Server, API ม่ากเก�นไป็• อยากเอาฟี-เจิอรั.ม่ารัวุม่ก�นพรั�อม่ท��งใชั� Design Pattern ด�วุย ?• Light Weight

สม%ยน��

My Basic Requirements for Lightweight Container

• Lifecycle management• Lookup• Configuration• Dependency resolution

lightweight Container (Value Added)

• Transaction• Thread management• Object pooling• Clustering• Management• Remoting• Exposing remote services• Consuming remote services• Customization and extensibility• AOP

What actually Spring is?

• Framework that …– make Enterprise Java easier to use– promote good programming practice– enabling a POJO-based programming

model that is applicable in a wide range of environments

• Some said Spring is just a “glue” for connecting all state of the art technologies together via it’s Application Context.

• Heart and Soul of Spring is Dependency Injection and Aspect Oriented Programming.

Main Components

Layer of Application

Dependency Injection หริ�อ

Inversion Of Control

โดยท�#วุไป็ เม่"#อใชั� IOC

• Hollywood Principle: "Don't call me, I'll call you."

Why IoC is Matter? • Removes explicit dependence on container

APIs • Because components don't need to look up

collaborators at runtime, they're much simpler to write and maintain

• Application code is much easier to test • A good IoC implementation preserves strong

typing • Dependencies are explicit• No more Application Server dependent

Bean?

• Bean is a service• Service =

Interface+Implement+Descriptor• Bean อาศ�ยอย��ใน Bean Factory หรั"อ

Application Context• Application Context ค"อห�วุใจิของ Spring• ค�ดไม่�ออกต�องสรั�าง Application Context ข2�นม่า

ก�อน

Configurationส�วินมากจะช��อ applicationContect.xml

Initial Context

//Load Context Manually From AppConfig.class

ApplicationContext context =

new FileSystemXmlApplicationContext(

"classpath:/applicationContext.xml"); //Lookup Bean named

Clinic clinic = (Clinic)context.getBean(“clinic”);

Collection<Vet> vets = clinic.getVets();

The “PetClinic”

The “Lightweight Container ” Architecture

Basic Architecture• Spring JDBC• Spring Core• Spring Web MVC• JSP• jQuery• Separate Web Module from Service Module

by using “HTTP Remoting”

Basic Requirement• Use Cases

– View a list of veterinarians and their specialties– View information pertaining to a pet owner– Update the information pertaining to a pet owner– Add a new pet owner to the system– View information pertaining to a pet– Update the information pertaining to a pet– Add a new pet to the system– View information pertaining to a pet's visitation

history– Add information pertaining to a visit to the pet's

visitation history

• Business Rules– An owner may not have multiple pets with the same

case-insensitive name

Checkout Code from Google Code

• Create Test Case Call “isClinicServiceReady”

– @Autowired– protected Clinic clinic;– @Test– public void isCliniceReady() {– assertNotNull(clinic);– }

• We have done creating our first “bean”.

Checkout Code from Google Code

• Create – “interface Clinic”

• Run Test (Fail!!!!!)• Create

– applicationContect.xml– Copy content from “Master Project”– “src\test\resources\org\spring66\

training3\test\petclinic\baseline”

• Run Test !!!!!!• We have done creating our first “bean”.

What we have done?

Why Test First

• Test case is “META-CODE”, code that explains code.

• Feel confident for refactor, move and share.

Checkout Code from Google Code

• Create “interface ListDataService”• Create “class ListDataServiceImpl”

– @Override– public List getElementsList() {– List list = new ArrayList();– list.add("Tom");– list.add("Henri");– list.add("Jim");– return list;– }

Go more deep into “DataSource”

DB

ConnectionDataSource

HibernateiBatisOpenJPA

PersistenceManager

OracleMsSQLDB2MySQL

Go more deep into “DataSource”

• Basically we must have this information for datasource

– Driver Class– Driver Class Name– Connection String (URL)– Username– Password– Plus some optional parameters depends on Driver

Manager (Pool Size, Wait Time, bla bla bla)

Go more deep into DataSource

• Basically we must have this information– <bean id="dataSource" class=“$Driver">– <!-- Connection Info -->– <property name="driverClassName"

value="${jdbc.driverClassName}" />– <property name="url" value="${jdbc.url}" />– <property name="username" value="${jdbc.username}" />– <property name="password" value="${jdbc.password}" />– <!-- Connection Pooling DBCP -->– <property name="initialSize" value="5"/>– <property name="maxActive" value="100" />– <property name="maxIdle" value="30" />– <property name="maxWait" value="1000" />– <property name="poolPreparedStatements" value="true" />– <property name="defaultAutoCommit" value="false" />

</bean>

Spring JDBC

- The value add provided by the Spring Framewo rk JDBC abstraction is perhaps best shown by t he sequence of actions outlined in the table.

Spring JDBC

Action Spring You

Define connection parameters.   X

Open the connection. X  

Specify the SQL statement.   X

Declare parameters and provide parameter values   X

Prepare and execute the statement. X  

Set up the loop to iterate through the results (if any). X  

Do the work for each iteration.   X

Process any exception. X  

Handle transactions. X  

Close the connection, statement and resultset. X  

Go more deep into Spring JDBC

• JdbcTemplate• NamedParameterJdbcTemplate • SimpleJdbcTemplate • SimpleJdbcInsert and SimpleJdbcCall • RDBMS Objects including MappingSqlQuery,

SqlUpdate and StoredProcedure

Go more deep into Spring JDBC

• DataSource• Prepared Statement• Mapper• Extractor

Move up to Service Layer

• The most important part of our Application.• All business logics are located, here• Test it carefully, change very often.

Controller Service

Entity A

Entity B

Entity C

Spring Web MVC Flow

• Clear separation of roles • Powerful and straightforward configuration of both

framework and application classes as JavaBeans. • Adaptability, non-intrusiveness, and flexibility. • Customizable binding and validation • Customizable handler mapping and view resolution • Flexible model transfer • Beans whose lifecycle is scoped to the current HTTP

request or HTTP Session

Spring DispatcherServlet

Dispatcher Servlet

<web-app>

<servlet>

<servlet-name>example</servlet-name>

<servlet-class>

org.springframework.web.servlet.DispatcherServlet

</servlet-class>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>example</servlet-name>

<url-pattern>*.form</url-pattern>

</servlet-mapping>

</web-app>

Example-servlet.xml

<context:component-scan base-package="com.spring66.petclinic.web"/>

<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" p:order="0"/>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/"

p:suffix=".jsp" p:order="1"/>

<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"

p:basename="messages"/>

Context Hierarchy

Web Layer

• Need Spring Boot Strap

Web Context

SpringContext

Web Context

SpringContext

org.springframework.web.context.ContextLoaderListenerweb.xml

Bootstrapping web applications

• Spring allows for seamlessly bootstrapping @Configuration classes within your servlet container's web.xml deployment descriptor

<listener>

<listener-class>

org.springframework.web.context.ContextLoaderListener

</listener-class>

</listener>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/applicationContext.xml</param-value>

</context-param>

Still have xxx-servlet.xml

• Need to create abc-servlet.xml for mapping request from dispatcher servlet

• <context:component-scan

base-package="com.spring66.petclinic.web"/>

• Also can config other parameters like binding, viewResolver,…

Still have xxx-servlet.xml

@Controller

public class ClinicController {

private final Clinic clinic;

@Autowired

public ClinicController(Clinic clinic) {

this.clinic = clinic;

}

@RequestMapping("/")

public String welcomeHandler() {

return "welcome";

}

First Controller

• Named “ClinicController”• And then Copy Content from Main Project • src\main\java\com\spring66\petclinic\web

• ====ClinicController======

• “mvn jetty:run –Dmaven.test.skip=true –Djetty.port=9999”

• http://localhost:9999/

First Controller, Test First

• Create “VetControllerTests”• And then Copy Content from Web.text• ====TestVetController======

• Wowwww!!! Full of “red” things, so let’s eliminate them.

Create VetController

• List All Vet• Create “VetController”• Copy content from “Web.txt”• Part “VetController”• There are two interesting parts:• Inject “clinic” service into controller

– @Autowired

• And Request Mapping– @Request over “public Collection<Vet> list()”– It will handles {WebContext}/main/vet/list

OwnerController, Test First

• Create “OwnerControllerTests”• And then Copy Content from Web.text• ====TestOwnerController======

• Wowwww!!! Full of “red” things, so let’s eliminate them.

Let’s do more action, Test First

• Create “OwnerController”– Copy content from “Web.txt”– Part “SearchOwnerController”– If it works so move forward

• Do some magic by adding new Owner– Copy content from “Web.txt”– Part “AddOwnerController”

• Create “ViewUtils”– Copy content from “Web.txt”– Part “ViewUtils”

• Create “PageType”.. Good u can guest, next