Java UDP聊天程序

import java.awt.BorderLayout;

import java.awt.List;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

import java.net.UnknownHostException;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class netchat {

JFrame jf=new JFrame("我的网络聊天程序");

List l=new List(6);

JPanel jp=new JPanel();

TextField tip=new TextField(15);

TextField tdata=new TextField(15);

DatagramSocket ds;

//DatagramPacket dp;

public netchat()

{

tip.setText("127.0.0.1");

try {

ds=new DatagramSocket(3000);

} catch (SocketException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

new Thread(new Runnable()

{

DatagramPacket dp;

public void run()

{

byte [] buf=new byte[1024];

dp=new DatagramPacket(buf,1024);

//

// byte[] buf=new byte[1024];

// dp=new DatagramPacket(buf,1024);

while(true)

{

try {

ds.receive(dp);

// l.add(dp.getAddress().getHostName() "say:" new String(buf,0,dp.getLength()), -1);

l.add(dp.getAddress().getHostAddress() " say:" new String(buf,0, dp.getLength()), -1);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}).start();

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new netchat().init();

}

private void init()

{

jf.add(l);

jp.add(tip,BorderLayout.WEST);

jp.add(tdata,BorderLayout.EAST);

jf.add(jp,BorderLayout.SOUTH);

jf.setSize(300, 300);

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

tdata.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

// byte[] buf;

// buf=e.getActionCommand().getBytes();

// DatagramPacket dp;

// try

// {

// dp=new DatagramPacket(buf,buf.length,InetAddress.getByName(tip.getText()),3000);

// ds.send(dp);

//

byte [] buf;

buf=e.getActionCommand().getBytes();

DatagramPacket dp;

try {

dp= new DatagramPacket(buf,buf.length,InetAddress.getByName(tip.getText()), 3000);

ds.send(dp);

} catch (UnknownHostException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

} catch (IOException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

((TextField)e.getSource()).setText("");

}

});

}

}