Distributed Computing Project Report

DISTRIBUTED COMPUTINGPROJECT REPORT DISTRIBUTED COMPUTING IN TRANSFERRING IMAGE USING JAVA LANGUAGE

NAMEID NUMBER

ANIS NUR HAMIZAH BINTI KAMARUDIN17173

RAJA NURUL IZZATI BINTI RAJA HANAFIAH17236

1.0 INTRODUCTIONSharing files using devices became essential nowadays. To show the contribution of Distributed Computing in this application, we decided to create an online chatting room for sharing images and chatting. It is basedon Client-Server application using java. A server will be established for the connection between the client and servers.Client/server architecture is a computing model in which the server hosts, delivers and manages most of the resources and services to be consumed by the client. This type of architecture has one or more client computers connected to a central server over a network or Internet connection. This system shares computing resources.

2.0 OBJECTIVEThis project is aimed to establish a connection between Client and Server to allow the user to chat and share images among them.

3.0 PROJECT OVERVIEWThis project is to show the uses of Distributed Computing in our daily life. As example we would like to create an application to allow the user chatting and share images between them. The conversation will be join by many Clients from different desktop and a server like a broadcast message. They can view the conversation in the window and sending each other messages. The connection is established using the LAN network and Internet Client/server architecture may also be referred to as a networking computing model because all the requests and services are delivered over a network. Client/server architecture is a producer-consumer computing architecture where the server acts as the producer and the client as a consumer. The server houses and provides high-end, computing-intensive services to the client on demand. These services can include applications access, storage, file sharing, printer access and/or direct access to the servers raw computing power.So in this chatting application, we create the sharing images between multiple clients based on the file sharing services. The clients will enter the chatroom when the server is up and they can chat and share images. We have decided to use Java Language to create our project. Using Java, we have build a terminal and GUI for Client and Server. A server computer can manage several clients simultaneously, whereas one client can be connected to several servers at a time, each providing a different set of services. Then, the client must enter their nickname to register into the server with the specific port number given. So, all client will be in the same chatroom, if they registered with the similar port number. After they have entering the chatroom, they can chatting and sharing images among them.

4.0 METHODOLOGYSince we are using Java Language to produce Client/Server terminal for our chatroom, here we also include the code for attaching image in the chatroom: BufferedImageFor transferring image in the chat application, there are some line of code that has to be added. The image will be send to the server and it will broadcasted to the other clients using socket. Java BufferedImage class is a subclass of Image class. It is used to handle and manipulate the image data. It also need ImageIO which is the class containing static convenience methods for locating ImageReaders and ImageWriters, and performing simple encoding and decoding. The BufferedImage coding is located in the Server program to run and it is output in a Client program.Sample code:In Server:BufferedImage img=ImageIO.read(ImageIO.createImageInputStream(socket.getInputStream())); System.out.println("Image received!!!!"); lblimg.setIcon(img);

In Client: ImageIcon img1=new ImageIcon("PIC2.jpg"); Image img = img1.getImage(); Image newimg = img.getScaledInstance(100, 120 java.awt.Image.SCALE_SMOOTH); ImageIcon newIcon = new ImageIcon(newimg);

bimg = ImageIO.read(new File("D:\picture\DSC02503.JPG")); ImageIO.write(bimg,"JPG",client.getOutputStream()); System.out.println("Image sent!!!!");

5.0 TOOLS (EG. EQUIPMENT, HARDWARE, ETC.) REQUIRED Tools Description

1. Microsoft Windows Operating System of student laptop

2. Eclipse Luna 4.4.1 Main Software for creating the Client/Server terminal

6.0 RESULTS6.1 PROJECT DELIVERABLESIn this section it will contain the information of the developed transferring image using java. We have produce the prototype using Java Language by Eclipse. The coding has been executed successfully. The application should consisted the following pages;1. Chat Client Window2. Chat Server Window3. Chat Message Window

The screenshots:1. Chat Server Window

Server interface

2. Chat Server Window

The client need to enter username and port number. The other client who wants to join the conversation need to use the same port number.


After all the clients have connected to the server, all the conversation will be appeared at the server interface


Each of every clients will be able to receive message from everyone.

5. Chat Client Window

If the client wants to exit from the chatroom, they have to click the logout button


The server will receive the action and notify other clients.


To know the available chatters, the client might click on Who is in button.


The attach picture button is for transferring image to other clients through the server. The server will notify the client whether the image is receive or not and then broadcast to other client to view or download.

7. 0 CONCLUSIONChatting room Application is one of the Architectural Model in Distributed Computing. We have almost successfull create the Chat Room and transferring the image between the chatters. We also have create the chat room using Java that have Client and Server terminal and using th BufferedImage method.

APPENDIXCodingServer.java

import java.awt.image.BufferedImage;import java.io.*;import java.net.*;import java.text.SimpleDateFormat;import java.util.*;

import javax.imageio.ImageIO;

public class Server {private static int uniqueId;private ArrayList al;private ServerGUI sg;private SimpleDateFormat sdf;private int port;private boolean keepGoing;private Socket socket;public Server(int port) {this(port, null);}public Server(int port, ServerGUI sg) {this.sg = sg;this.port = port;sdf = new SimpleDateFormat("HH:mm:ss");al = new ArrayList();}public void start() {keepGoing = true;try {ServerSocket serverSocket = new ServerSocket(port);

while(keepGoing) {display("Server waiting for Clients on port " + port + ".");Socket socket = serverSocket.accept(); if(!keepGoing)break;ClientThread t = new ClientThread(socket); al.add(t);t.start();}try {serverSocket.close();for(int i = 0; i < al.size(); ++i) {ClientThread tc = al.get(i);try {tc.sInput.close();tc.sOutput.close();tc.socket.close();}catch(IOException ioE) {}}}catch(Exception e) {display("Exception closing the server and clients: " + e);}}catch (IOException e) { String msg = sdf.format(new Date()) + " Exception on new ServerSocket: " + e + "\n";display(msg);}}protected void stop() {keepGoing = false;try {new Socket("localhost", port);}catch(Exception e) {}}private void display(String msg) {String time = sdf.format(new Date()) + " " + msg;if(sg == null)System.out.println(time);elsesg.appendEvent(time + "\n");}private synchronized void broadcast(String message) {String time = sdf.format(new Date());String messageLf = time + " " + message + "\n";if(sg == null)System.out.print(messageLf);elsesg.appendRoom(messageLf); // append in the room windowfor(int i = al.size(); --i >= 0;) {ClientThread ct = al.get(i);if(!ct.writeMsg(messageLf)) {al.remove(i);display("Disconnected Client " + ct.username + " removed from list.");}}}

synchronized void remove(int id) {for(int i = 0; i < al.size(); ++i) {ClientThread ct = al.get(i);if(ct.id == id) {al.remove(i);return;}}}public static void main(String[] args) {int portNumber = 1111;switch(args.length) {case 1:try {portNumber = Integer.parseInt(args[0]);}catch(Exception e) {System.out.println("Invalid port number.");System.out.println("Usage is: > java Server [portNumber]");return;}case 0:break;default:System.out.println("Usage is: > java Server [portNumber]");return;}Server server = new Server(portNumber);server.start();}

class ClientThread extends Thread {Socket socket;ObjectInputStream sInput;ObjectOutputStream sOutput;int id;String username;ChatMessage cm;String date;

ClientThread(Socket socket) {id = ++uniqueId;this.socket = socket;System.out.println("Thread trying to create Object Input/Output Streams");try{sOutput = new ObjectOutputStream(socket.getOutputStream());sInput = new ObjectInputStream(socket.getInputStream());username = (String) sInput.readObject();display(username + " just connected.");}catch (IOException e) {display("Exception creating new Input/output Streams: " + e);return;}catch (ClassNotFoundException e) {} date = new Date().toString() + "\n";}

public void run() {boolean keepGoing = true;while(keepGoing) {try {cm = (ChatMessage) sInput.readObject();}catch (IOException e) {display(username + " Exception reading Streams: " + e);break;}catch(ClassNotFoundException e2) {break;}String message = cm.getMessage();

switch(cm.getType()) {

case ChatMessage.MESSAGE:broadcast(username + ": " + message);break;case ChatMessage.LOGOUT:display(username + " disconnected with a LOGOUT message.");keepGoing = false;break;case ChatMessage.WHOISIN:writeMsg("List of the users connected at " + sdf.format(new Date()) + "\n");for(int i = 0; i < al.size(); ++i) {ClientThread ct = al.get(i);writeMsg((i+1) + ") " + ct.username + " since " + ct.date);}break;case ChatMessage.AttachPic:System.out.println("IMAGE IS RECEIVED.");//writeMsg("List of the users connected at " + sdf.format(new Date()) + "\n");break;}}remove(id);close();}private void close() {try {if(sOutput != null) sOutput.close();}catch(Exception e) {}try {if(sInput != null) sInput.close();}catch(Exception e) {};try {if(socket != null) socket.close();}catch (Exception e) {}}private boolean writeMsg(String msg) {if(!socket.isConnected()) {close();return false;}try {sOutput.writeObject(msg);}catch(IOException e) {display("Error sending message to " + username);display(e.toString());}return true;}}}

Client.java

import java.net.*;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.*;import java.util.*;

public class Client {Image newimg; BufferedImage bimg; byte[] bytes; private ObjectInputStream sInput;// to read from the socketprivate ObjectOutputStream sOutput;// to write on the socketprivate Socket socket;

private ClientGUI cg;private String server, username;private int port;

Client(String server, int port, String username) {this(server, port, username, null);}

Client(String server, int port, String username, ClientGUI cg) {this.server = server;this.port = port;this.username = username;this.cg = cg;}public boolean start() {try {socket = new Socket(server, port);} catch(Exception ec) {display("Error connectiong to server:" + ec);return false;}String msg = "Connection accepted " + socket.getInetAddress() + ":" + socket.getPort();display(msg);try{sInput = new ObjectInputStream(socket.getInputStream());sOutput = new ObjectOutputStream(socket.getOutputStream());}catch (IOException eIO) {display("Exception creating new Input/output Streams: " + eIO);return false;}

new ListenFromServer().start();try{sOutput.writeObject(username);}catch (IOException eIO) {display("Exception doing login : " + eIO);disconnect();return false;}return true;}

private void display(String msg) {if(cg == null)System.out.println(msg); elsecg.append(msg + "\n");}void sendMessage(ChatMessage msg) {try {sOutput.writeObject(msg);}catch(IOException e) {display("Exception writing to server: " + e);}}

private void disconnect() {try { if(sInput != null) sInput.close();}catch(Exception e) {} try {if(sOutput != null) sOutput.close();}catch(Exception e) {} try{if(socket != null) socket.close();}catch(Exception e) {} if(cg != null)cg.connectionFailed();}public static void main(String[] args) {int portNumber = 1111;String serverAddress = "localhost";String userName = "Anonymous";

switch(args.length) {case 3:serverAddress = args[2];case 2:try {portNumber = Integer.parseInt(args[1]);}catch(Exception e) {System.out.println("Invalid port number.");System.out.println("Usage is: > java Client [username] [portNumber] [serverAddress]");return;}case 1: userName = args[0];case 0:break;default:System.out.println("Usage is: > java Client [username] [portNumber] {serverAddress]");return;} ImageIcon img1=new ImageIcon("Ashish.jpg"); Image img = img1.getImage(); Image newimg = img.getScaledInstance(100, 120, java.awt.Image.SCALE_SMOOTH); ImageIcon newIcon = new ImageIcon(newimg);

bimg = ImageIO.read(new File("D:/gambar weh/nak/IMG_3799.JPG")); ImageIO.write(bimg,"JPG",client.getOutputStream()); System.out.println("Image sent!!!!"); Client client = new Client(serverAddress, portNumber, userName);if(!client.start())return;Scanner scan = new Scanner(System.in);while(true) {System.out.print("> ");String msg = scan.nextLine();if(msg.equalsIgnoreCase("LOGOUT")) {client.sendMessage(new ChatMessage(ChatMessage.LOGOUT, ""));break;}else if(msg.equalsIgnoreCase("WHOISIN")) {client.sendMessage(new ChatMessage(ChatMessage.WHOISIN, ""));}else if(msg.equalsIgnoreCase("AttachPic")) {client.sendMessage(new ChatMessage(ChatMessage.AttachPic, ""));}else {client.sendMessage(new ChatMessage(ChatMessage.MESSAGE, msg));}}client.disconnect();}

class ListenFromServer extends Thread {

public void run() {while(true) {try {String msg = (String) sInput.readObject();if(cg == null) {System.out.println(msg);System.out.print("> ");}else {cg.append(msg);}}catch(IOException e) {display("Server has close the connection: " + e);if(cg != null) cg.connectionFailed();break;}catch(ClassNotFoundException e2) {}}}}}

ServerGui.java

import javax.swing.*;import java.awt.*;import java.awt.event.*;import javax.swing.JFileChooser;import java.io.File;

public class ServerGUI extends JFrame implements ActionListener, WindowListener {private static final long serialVersionUID = 1L;private JButton stopStart;private JTextArea chat, event;private JTextField tPortNumber;private Server server;ServerGUI(int port) {super("Chat Server");server = null;JPanel north = new JPanel();north.add(new JLabel("Port number: "));tPortNumber = new JTextField(" " + port);north.add(tPortNumber);stopStart = new JButton("Start");stopStart.addActionListener(this);north.add(stopStart);add(north, BorderLayout.NORTH);JPanel center = new JPanel(new GridLayout(2,1));chat = new JTextArea(80,80);chat.setEditable(false);appendRoom("Chat room.\n");center.add(new JScrollPane(chat));event = new JTextArea(80,80);event.setEditable(false);appendEvent("Events log.\n");center.add(new JScrollPane(event));add(center);addWindowListener(this);setSize(400, 600);setVisible(true);}

void appendRoom(String str) {chat.append(str);chat.setCaretPosition(chat.getText().length() - 1);}void appendEvent(String str) {event.append(str);event.setCaretPosition(chat.getText().length() - 1);}public void actionPerformed(ActionEvent e) {if(server != null) {server.stop();server = null;tPortNumber.setEditable(true);stopStart.setText("Start");return;} int port;try {port = Integer.parseInt(tPortNumber.getText().trim());}catch(Exception er) {appendEvent("Invalid port number");return;}server = new Server(port, this);new ServerRunning().start();stopStart.setText("Stop");tPortNumber.setEditable(false);}public static void main(String[] arg) {new ServerGUI(1111);}

public void windowClosing(WindowEvent e) {if(server != null) {try {server.stop();}catch(Exception eClose) {}server = null;}dispose();System.exit(0);}public void windowClosed(WindowEvent e) {}public void windowOpened(WindowEvent e) {}public void windowIconified(WindowEvent e) {}public void windowDeiconified(WindowEvent e) {}public void windowActivated(WindowEvent e) {}public void windowDeactivated(WindowEvent e) {}

class ServerRunning extends Thread {public void run() {server.start(); stopStart.setText("Start");tPortNumber.setEditable(true);appendEvent("Server crashed\n");server = null;}}

}

ClientGUI.java

import javax.swing.*;import java.awt.*;import java.awt.event.*;

public class ClientGUI extends JFrame implements ActionListener {

private static final long serialVersionUID = 1L;private JLabel label;private JTextField tf;private JTextField tfServer, tfPort;private JButton login, logout, whoIsIn, AttachPic;private JTextArea ta;private boolean connected;private Client client;private int defaultPort;private String defaultHost;

ClientGUI(String host, int port) {

super("Chat Client");defaultPort = port;defaultHost = host;JPanel northPanel = new JPanel(new GridLayout(3,1));JPanel serverAndPort = new JPanel(new GridLayout(1,5, 1, 3));tfServer = new JTextField(host);tfPort = new JTextField("" + port);tfPort.setHorizontalAlignment(SwingConstants.RIGHT);

serverAndPort.add(new JLabel("Server Address: "));serverAndPort.add(tfServer);serverAndPort.add(new JLabel("Port Number: "));serverAndPort.add(tfPort);serverAndPort.add(new JLabel(""));northPanel.add(serverAndPort);

label = new JLabel("Enter your username below", SwingConstants.LEFT);northPanel.add(label);tf = new JTextField("Enter your name here");tf.setBackground(Color.PINK);northPanel.add(tf);add(northPanel, BorderLayout.NORTH);

ta = new JTextArea("Hi, you're in Kotak Borak !\n", 80, 80);JPanel centerPanel = new JPanel(new GridLayout(1,1));centerPanel.add(new JScrollPane(ta));ta.setEditable(false);add(centerPanel, BorderLayout.CENTER);

login = new JButton("Login");login.addActionListener(this);login.setBackground(Color.BLUE);logout = new JButton("Logout");logout.addActionListener(this);logout.setEnabled(false);logout.setBackground(Color.BLUE);whoIsIn = new JButton("Who is in");whoIsIn.addActionListener(this);whoIsIn.setEnabled(false);whoIsIn.setBackground(Color.BLUE);AttachPic = new JButton("Attach Picture");AttachPic.addActionListener(this);AttachPic.setEnabled(false);AttachPic.setBackground(Color.BLUE);

JPanel southPanel = new JPanel();southPanel.add(login);southPanel.add(logout);southPanel.add(whoIsIn);southPanel.add(AttachPic);add(southPanel, BorderLayout.SOUTH);

setDefaultCloseOperation(EXIT_ON_CLOSE);setSize(600, 600);setVisible(true);tf.requestFocus();

}

void append(String str) {ta.append(str);ta.setCaretPosition(ta.getText().length() - 1);}void connectionFailed() {login.setEnabled(true);logout.setEnabled(false);whoIsIn.setEnabled(false);AttachPic.setEnabled(false);label.setText("Enter your username below");tf.setText("Enter your name");tfPort.setText("" + defaultPort);tfServer.setText(defaultHost);tfServer.setEditable(false);tfPort.setEditable(false);tf.removeActionListener(this);connected = false;}public void actionPerformed(ActionEvent e) {Object o = e.getSource();if(o == logout) {client.sendMessage(new ChatMessage(ChatMessage.LOGOUT, ""));return;}if(o == whoIsIn) {client.sendMessage(new ChatMessage(ChatMessage.WHOISIN, ""));return;}if(o == AttachPic) {client.sendMessage(new ChatMessage(ChatMessage.AttachPic, ""));return;}if(connected) {client.sendMessage(new ChatMessage(ChatMessage.MESSAGE, tf.getText()));tf.setText("");return;}

if(o == login) {String username = tf.getText().trim();if(username.length() == 0)return;String server = tfServer.getText().trim();if(server.length() == 0)return;String portNumber = tfPort.getText().trim();if(portNumber.length() == 0)return;int port = 0;try {port = Integer.parseInt(portNumber);}catch(Exception en) {return; }

client = new Client(server, port, username, this);if(!client.start()) return;tf.setText("");label.setText("Enter your message below");connected = true;login.setEnabled(false);logout.setEnabled(true);whoIsIn.setEnabled(true);AttachPic.setEnabled(true);tfServer.setEditable(false);tfPort.setEditable(false);tf.addActionListener(this);}

}

public static void main(String[] args) {new ClientGUI("localhost", 1111);}

}ChatMessage.java

import java.io.*;

public class ChatMessage implements Serializable {

protected static final long serialVersionUID = 1112122200L;static final int WHOISIN = 0, MESSAGE = 1, LOGOUT = 2, AttachPic = 3;private int type;private String message;ChatMessage(int type, String message) {this.type = type;this.message = message;}int getType() {return type;}String getMessage() {return message;}}

39

Documents

Distributed Computing Project Report