建立一个服务监听和一个客户端,模拟聊天程序
求代码

------解决方案--------------------
package com.tsing.chat.frame;



import java.awt.*;
import java.awt.event.*;
import java.util.EventListener;
import java.io.*;
import java.net.*;

import javax.swing.JOptionPane;


public class ClientFrame extends Frame implements ActionListener {
//窗体应该有发送按钮、文本框用来输入东西、List列表用来显示信息

Button connectbutton = new Button("连接");

Button sendbutton = new Button("发送");

List list = new List();

TextField content = new TextField(20);

TextField servername = new TextField("localhost", 20);

Label label = new Label("输入服务器名字：");

Socket socket;

String num;

public ClientFrame(String num) {

this.num = num;
this.setTitle("山寨QQ (用户:" + num + ")");

this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
try {
MsgBean bean = new MsgBean();
bean.setType("请求下线");
bean.setSource(ClientFrame.this.num);
//发送消息请求下线
OutputStream out = socket.getOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(
out);
objectOutputStream.writeObject(bean);
objectOutputStream.flush();
} catch (Exception ew) {
ew.printStackTrace();
}
//退出系统
System.exit(0);
}
});

sendbutton.addActionListener(this);
connectbutton.addActionListener(this);
Panel p1 = new Panel();
p1.add(label);
p1.add(servername);
p1.add(connectbutton);

Panel p2 = new Panel();
p2.add(content);
p2.add(sendbutton);

Panel p3 = new Panel();
p3.setLayout(new BorderLayout());
p3.add("South", p2);

list.setFont(new Font("微软雅黑", Font.BOLD, 14));
p3.add(new ScrollPane().add(list));

this.add("South", p1);
this.add(p3);
this.setSize(400, 300);//
this.setResizable(false); //不能缩放窗口
this.setVisible(true);
}

public static void main(String[] args) {
String num = JOptionPane.showInputDialog(null, "输入自己的QQ号码");
boolean b = false;
do {
b = false;
if (num == null || num.equals("")) {
num = JOptionPane.showInputDialog("QQ号码不能为空，请重新输入:");
b = true;
}
} while (b);

new ClientFrame(num);

}

/**
* 客户端：发消息给每个人
* 1、启动聊天界面
* 2、输入QQ号和服务器IP(机器名)，建立连接
* 3、启动客户端线程，监视服务器是否转发消息,然后显示到界面
* 4、直接通过自己的socket发送消息
* */
public void actionPerformed(ActionEvent e) {

if (e.getSource() == connectbutton) {
String string = servername.getText();
try {
socket = new Socket(string, 9000);
connectbutton.setEnabled(false);

MsgBean bean = new MsgBean();
bean.setType("请求登陆");
bean.setSource(num);
bean.setTarget("admin");
// //发送请求登陆的消息
OutputStream outputStream = socket.getOutputStream();
ObjectOutputStream objout = new ObjectOutputStream(outputStream);
objout.writeObject(bean);
objout.flush();
//
//启动客户端线程,监视服务器转来的消息 
new Thread(new ClientThread(this)).start();
JOptionPane.showMessageDialog(null, "连接成功,聊吧!");

} catch (Exception e1) {
e1.printStackTrace();
}
} else if (e.getSource() == sendbutton) {
try {

if (socket == null) {
JOptionPane.showMessageDialog(this, "请点击链接按钮，连接到服务器!!");
return;
} 
String info = content.getText();