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客戶端：

import java.io.*;

import java.net.*;

import java.awt.*;

import java.awt.event.*;

public class ChatClient extends Frame

{

TextArea ta = new TextArea();

TextField tf = new TextField();

public void launchFrame() throws Exception

{

this.add(ta, BorderLayout.CENTER);

this.add(tf, BorderLayout.SOUTH);

tf.addActionListener(

new ActionListener()

{

public void actionPerformed(ActionEvent ae)

{

try {

String sSend = tf.getText();

if(sSend.trim().length() == 0) return;

ChatClient.this.send(sSend);

tf.setText("");

ta.append(sSend + "\n");

}

catch (Exception e)

}

}

);

this.addWindowListener(

new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

);

setBounds(300,300,300,400);

setVisible(true);

tf.requestFocus();

}

Socket s = null;

public ChatClient() throws Exception

{

s = new Socket("127.0.0.1", 8888);

launchFrame();

(new Thread(new ReceiveThread())).start();

}

public void send(String str) throws Exception

{

DataOutputStream dos = new DataOutputStream(s.getOutputStream());

dos.writeUTF(str);

}

public void disconnect() throws Exception

{

s.close();

}

public static void main(String[] args) throws Exception

{

BufferedReader br = new BufferedReader (

new InputStreamReader(System.in));

ChatClient cc = new ChatClient();

String str = br.readLine();

while(str !e68a843231313335323631343130323136353331333264623165= null && str.length() != 0)

{

cc.send(str);

str = br.readLine();

}

cc.disconnect();

}

class ReceiveThread implements Runnable

{

public void run()

{

if(s == null) return;

try {

DataInputStream dis = new DataInputStream(s.getInputStream());

String str = dis.readUTF();

while (str != null && str.length() != 0)

{

//System.out.println(str);

ChatClient.this.ta.append(str + "\n");

str = dis.readUTF();

}

}

catch (Exception e)

{

e.printStackTrace();

}

}

}

}

服務器：

import java.net.*;

import java.util.*;

import java.io.*;

import java.awt.*;

import java.awt.event.*;

public class ChatServer extends Frame

{

TextArea ta = new TextArea();

public void launchFrame()

{

add(ta, BorderLayout.CENTER);

setBounds(0,0,200,300);

this.addWindowListener(

new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

);

setVisible(true);

}

ServerSocket server = null;

Collection cClient = new ArrayList();

public ChatServer(int port) throws Exception

{

server = new ServerSocket(port);

launchFrame();

}

public void startServer() throws Exception

{

while(true)

{

Socket s = server.accept();

cClient.add( new ClientConn(s) );

ta.append("NEW-CLIENT " + s.getInetAddress() + ":" + s.getPort());

ta.append("\n" + "CLIENTS-COUNT: " + cClient.size() + "\n\n");

}

}

class ClientConn implements Runnable

{

Socket s = null;

public ClientConn(Socket s)

{

this.s = s;

(new Thread(this)).start();

}

public void send(String str) throws IOException

{

DataOutputStream dos = new DataOutputStream(s.getOutputStream());

dos.writeUTF(str);

}

public void dispose()

{

try {

if (s != null) s.close();

cClient.remove(this);

ta.append("A client out! \n");

ta.append("CLIENT-COUNT: " + cClient.size() + "\n\n");

}

catch (Exception e)

{

e.printStackTrace();

}

}

public void run()

{

try {

DataInputStream dis = new DataInputStream(s.getInputStream());

String str = dis.readUTF();

while(str != null && str.length() !=0)

{

System.out.println(str);

for(Iterator it = cClient.iterator(); it.hasNext(); )

{

ClientConn cc = (ClientConn)it.next();

if(this != cc)

{

cc.send(str);

}

}

str = dis.readUTF();

//send(str);

}

this.dispose();

}

catch (Exception e)

{

System.out.println("client quit");

this.dispose();

}

}

}

public static void main(String[] args) throws Exception

{

ChatServer cs = new ChatServer(8888);

cs.startServer();

}

}

(來自BJSXT)

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