使用UDP实现一个简单的聊天程序。

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class sendDemo {

/**

* @param args

*/

public static void main(String[] args)throws Exception {

// TODO Auto-generated method stub

DatagramSocket ds=new DatagramSocket();

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

String line=null;

while((line=br.readLine())!=null){

if(line.equals("886")){

break;

}

byte[] buf="fsdfsdfd".getBytes();

InetAddress is=InetAddress.getByName("192.168.49.255");

DatagramPacket dp=new DatagramPacket(buf,buf.length,is,9009);

ds.send(dp);

}

ds.close();

}

}

package csdn.hbsi.com;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

public class ReceiveDemo {

/**

* @param args

*/

public static void main(String[] args)throws Exception {

// TODO Auto-generated method stub

DatagramSocket ds=new DatagramSocket(9009);

while(true){

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(),0,dp.getLength());

int port=dp.getPort();

System.out.println(ip+":"+port+"\n\t"+data);

}

}

}