package cn.itcast.day1;
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.TextArea;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionEvent;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class MyQQ {
/**
  * @param args
  */
private Frame f;
private TextArea ta1,ta2;
private Button cancelBut,sendBut;
MyQQ()
{
  init();
}
public void init()
{
  f= new Frame("my qq");
  ta1 = new TextArea(12,65);
  ta2 = new TextArea(12,65);
     cancelBut = new Button("取消");
  sendBut = new Button("发送");
  
  f.setBounds(200, 100, 500, 550);
  f.setLayout(new FlowLayout());
  
  f.add(ta1);
  f.add(ta2);
  f.add(cancelBut);
  f.add(sendBut);
  
  myEvent();
  f.setVisible(true);
  
}
public void myEvent()
{
  f.addWindowListener(new WindowAdapter()
  {
   public void windowClosing(WindowEvent e)
   {
    System.exit(0);
   }
   
  });
  cancelBut.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e)
   {
    f.setVisible(false);
   }
  });
  sendBut.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e)
   {
    String text = ta2.getText();
    try {
     send(text);
    } catch (Exception e1) {
     // TODO Auto-generated catch block
     e1.printStackTrace();
    }
    //receive();
    receive();
   }
  });
}
public void send(final String str) throws Exception
{
  
  new Thread(new Runnable(){
   public void run()
   {
    try
    {
     DatagramSocket ds = new DatagramSocket();
     byte[] buf =str.getBytes();
     DatagramPacket dp =
      new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.23"),10000);
     ds.send(dp);
    }
    catch(Exception e)
    {
     System.out.println("发送失败");
    }
   }
  }).start();
  
}
public void receive()
{
  
  new Thread(new Runnable(){
   public void run()
   {
    try
    {
     DatagramSocket ds = new DatagramSocket(10000);
     byte[] buf = new byte[1024];
     DatagramPacket dp = new DatagramPacket(buf,buf.length);
     ds.receive(dp);
     String ip = dp.getAddress().getHostAddress();
     String data = new String(dp.getData());
     int port = dp.getPort();
     ta1.setText(ip+":"+data);
     
    }
    catch(Exception e)
    {
     System.out.println("接收失败");
    }
   }
  }).start();
  
}
public static void main(String[] args) {
  // TODO Auto-generated method stub
  new MyQQ();
}
}

再加个JDBC 数据库，server服务器端,更完善了.....

改什么问题啊?

这个看着不想QQ啊

好吧，我不知道，我是沙发，呵呵