使用UDP协议编写一个网络程序............................

 

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDOf {

public static void main(String[] args)throws Exception {
// TODO Auto-generated method stub

DatagramSocket ds=new DatagramSocket(3000);
String str="hello word";
DatagramPacket dp=new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),8001);
System.out.println("发送信息");
ds.send(dp);
ds.close();
}

}

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UDPj {

public static void main(String[] args)throws Exception {
// TODO Auto-generated method stub
byte[] buf=new byte[1024];
DatagramSocket ds=new DatagramSocket(8001);
DatagramPacket dp=new DatagramPacket(buf,1024);
System.out.println("等待接受数据");
ds.receive(dp);
String str=new String(dp.getData(),0,dp.getLength())+"from"+dp.getAddress().getHostAddress()+":"+dp.getPort();
System.out.println(str);
ds.close();



}

}