爱玺玺

UdpSend.java

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

public class UdpSend{

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

DatagramSocket ds =new DatagramSocket();

String str="hello xiang shuo zhang hua 后面是IP和端口";

ds.send(new DatagramPacket(str.getBytes(), str.getBytes().length,InetAddress.getByName("192.168.0.103"),3000));

}//str.getBytes().length汉字需要字节的长度而不是字符的长度，不然会导致存储空间不够的问题

}

UdpRecive.java

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketException;

public class UdpRecive{

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

DatagramSocket ds=new DatagramSocket(3000);//套接字

byte[] buf=new byte[1024];//存放接收的数据字节数组

DatagramPacket dp=new DatagramPacket(buf, 1024);//dp接收数据对象，接收的数据放在buf里面

ds.receive(dp);//用来接收数据

System.out.println(

new String(dp.getData(),0,dp.getLength())+//getData()

dp.getAddress().getHostAddress()+

        dp.getPort()

        );

ds.close();

}

}