Java Swing实现TCP网络聊天应用

import java.awt.BorderLayout;   
import java.awt.Button;   
import java.awt.Color;   
import java.awt.Label;   
import java.awt.TextArea;   
import java.awt.TextField;   
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.PrintStream;   
import java.net.InetAddress;   
import java.net.Socket;   
import java.util.StringTokenizer;   
  
import javax.swing.JFrame;   
import javax.swing.JOptionPane;   
import javax.swing.JPanel;   
  
/**  
 * 基于Socket网络聊天程序 客户端编码  
 * @author 欧阳平 2009-3-17   
 */  
public class ChatClient extends JFrame  implements ActionListener,Runnable{   
       
    TextField tfName = new TextField(15);//姓名输入文本域   
    Button btConnect = new Button("连接");//连接按钮   
    Button btDisconnect = new Button("断开连接");//断开连接按钮   
    TextArea tfChat = new TextArea(8,27);//显示聊天信息文本域   

    Button btSend = new Button("发送");   
    TextField tfMessage = new TextField(30);//聊天输入   
    java.awt.List list1  = new java.awt.List(9);//显示在线用户信息    
    Socket socket = null;//连接端口   
    PrintStream ps = null;//输出流   
    Listen listen = null;   
    //监听线程类   
    class Listen extends Thread {   
        BufferedReader reader;   
        PrintStream ps;   
        String cname;   
        Socket socket;   
        ChatClient chatClient;   
        public Listen(ChatClient client,String name,Socket socket) {   
            try {   
                this.chatClient = client;   
                 this.socket = socket;   
                 this.cname = name;   
                 reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));   
                 ps = new PrintStream(socket.getOutputStream());   
            } catch (IOException e) {   
                e.printStackTrace();   
            }   
        }   
        public void run() {   
            while (true) {   
                String line=null ;   
                try {   
                line = reader.readLine(); //读取数据流   
                System.out.println("客户端："+line);