基于java的chat简单聊天系统

import java.lang.*; import java.awt.*; import java.net.*; import java.awt.event.*; public class j03130301 extends Frame implements Runnable { Label L1,L2; TextField text1,text2; Button B1; List list1; public j03130301() { this.setLayout( null ); //======================================== L1 = new Label("对方 IP："); L1.setBounds(10,30,60,30); this.add(L1); L2 = new Label("发言："); L2.setBounds(10,70,60,30); this.add(L2); text1 = new TextField("127.0.0.1", 20); text1.setBounds(75,30,200,30); this.add(text1); text2 = new TextField(); text2.setBounds(75,70,320,30); this.add(text2); B1 = new Button("send"); B1.setBounds(400,70,60,30); B1.addMouseListener( new myMouseListener() ); this.add(B1); list1 = new List(15); list1.setBounds(15,110,450,300); this.add(list1); //======================================== this.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); this.setTitle("使用 UDP 的网络聊天程序"); this.setBounds(100,100,480,430); this.setVisible( true ); }//public j03130301() end public void run() { //接收数据 while( true ) { //持续接收送到本地端的信息 byte[] buf = new byte[100];//预期最多可收 100 个 byte try { DatagramSocket DS = new DatagramSocket( 2222 ); //用 2222 port 收 /* 只管接收要送到本地端 2222 port 的数据包， 不必管该数据包是从远程的那个 port 送出。 */ DatagramPacket DP = new DatagramPacket( buf,buf.length ); //将数据收到 buf 数组 DS.receive( DP ); //接收数据包 list1.add( "来自 " + DP.getAddress().getHostAddress() + ":" + DP.getPort() + " ＞" + new String( buf ).trim() ); //此处用 new String(DP.getData()).trim() 也一样 DS.close(); Thread.sleep(200); //停 0.2 秒 } catch(Exception excep){} } } // void run() end class myMouseListener extends MouseAdapter { //送数据 public void mouseClicked(MouseEvent e) { //每次 Click 按钮就发送信息到目的端主机 String msg = text2.getText().trim(); String ipStr = text1.getText().trim(); try { DatagramSocket DS = new DatagramSocket(); //以任一目前可用的port 送 DatagramPacket DP = new DatagramPacket( msg.getBytes(), msg.getBytes().length, InetAddress.getByName(ipStr), 2222 ); //送到远程的 2222 port DS.send( DP ); //送出数据包 list1.add( "送出：" + msg.trim() ); //给自己看的记录 DS.close(); } catch(Exception excep){} } //void mouseClicked(MouseEvent e) end } //class myMouseListener end public static void main(String arg[]) { j03130301 Form1 = new j03130301(); Thread threadObj = new Thread( Form1 ); threadObj.start();//启动接收信息的线程 } //void main(String arg[]) end } //class j03130301 end