Sample Chat Client-Server Application

ServerApplication.java
==============================================

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Iterator;

/**
*
*/

/**
* @author lavakushv
*
*/
public class ServerApp {
ArrayList clientOutputStreams;
public class ClientHandler implements Runnable{
BufferedReader reader;
Socket sock;
public ClientHandler(Socket clientSocket){

try {
sock=clientSocket;
InputStreamReader isr=new InputStreamReader(sock.getInputStream());
reader=new BufferedReader(isr);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void run() {
// TODO Auto-generated method stub
String message;
try {
while((message=reader.readLine())!=null)
{
System.out.println("read :"+message);
tellEveryone(message);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void tellEveryone(String message) {
// TODO Auto-generated method stub
Iterator itr=clientOutputStreams.iterator();
while(itr.hasNext()){
PrintWriter pWriter=(PrintWriter)itr.next();
pWriter.println(message);
pWriter.flush();
}
}

}
public static void main(String[] args) {
// TODO Auto-generated method stub

new ServerApp().createSocket();
}
private void createSocket() {
// TODO Auto-generated method stub
clientOutputStreams=new ArrayList();
try {
ServerSocket socket=new ServerSocket(5000);
while(true){
Socket clientSocket=socket.accept();
PrintWriter writer=new PrintWriter(clientSocket.getOutputStream());
clientOutputStreams.add(writer);
Thread t = new Thread(new ClientHandler(clientSocket));
t.start();
System.out.println("Got a Connection to the Client");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

==================================================

Chat Client Source Code
===================================================
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;

/**
*
*/

/**
* @author lavakushv
*
*/
public class ChatClient {
JTextField outgoing;
JTextArea incoming;
BufferedReader reader;
PrintWriter writer;
Socket sock;
public void layOutDesign(){
JFrame frame= new JFrame("Simple Chat Client");
JPanel mainPanel= new JPanel();
incoming= new JTextArea(15,25);
incoming.setLineWrap(true);
incoming.setWrapStyleWord(true);
incoming.setEditable(false);
JScrollPane qScroller=new JScrollPane(incoming);
qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
outgoing=new JTextField(20);
JButton sendButton=new JButton("Send");
sendButton.addActionListener(new SendButtonListener());
mainPanel.add(qScroller);
mainPanel.add(outgoing);
mainPanel.add(sendButton);
setupNetworking();
Thread readerThread=new Thread(new IncomingReader());
readerThread.start();
frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
frame.setSize(400, 500);
frame.setVisible(true);
}
private void setupNetworking() {
// TODO Auto-generated method stub
try {
sock=new Socket("10.30.10.156", 5000);
InputStreamReader isR=new InputStreamReader(sock.getInputStream());
reader=new BufferedReader(isR);
writer=new PrintWriter(sock.getOutputStream());
System.out.println("Network Established.");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public class SendButtonListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent ev) {
// TODO Auto-generated method stub
try{
writer.println(outgoing.getText());
writer.flush();
}catch (Exception e1) {
// TODO: handle exception
e1.printStackTrace();
}

outgoing.setText("");
outgoing.requestFocus();
}

}
public static void main(String[] args) {
// TODO Auto-generated method stub
new ChatClient().layOutDesign();
}
public class IncomingReader implements Runnable{

String message;
@Override
public void run() {
// TODO Auto-generated method stub
try {
while((message=reader.readLine())!=null){
System.out.println("Read :"+message);
incoming.append(message+"\n");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}
}

====================================================
Go to server code...
and change the IP of your System
then connect to the Clients


And enjoy the Chatting between your colleagues in your Network....


Thanks for Dropping into this.

lavkush