package com.zhangxueliang.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
/**
 * 使用UDP協議傳送接收資料
 * @author zxlt
 *
 */
public class SendDemo {

    public static void main(String[] args) throws IOException {
        //建立傳送端socket物件
 

        DatagramSocket ds = new DatagramSocket();
        //建立資料並打包
        String s = "Hello udp222,Im coming";
        byte[] bys = s.getBytes();
        int length = bys.length;
        InetAddress address = InetAddress.getByName("zxlt");
        int port  = 8888;
        //打包
        DatagramPacket dp = new
 
 DatagramPacket(bys,length,address,port);
        //傳送資料
        ds.send(dp);
        //釋放資源
        ds.close();
    }

}

package com.zhangxueliang.udp;

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

public class ReceiveDemo {
    
 
public static void main(String[] args) throws IOException {
        //建立接收端Socket物件
        DatagramSocket ds = new DatagramSocket(8888);
        //接收資料
        byte[] bys = new byte[1024];
        DatagramPacket dp = new DatagramPacket(bys,bys.length);
        System.out.println(1);
        ds.receive(dp);//阻塞
        System.out.println(2);
        //解析資料
        InetAddress address = dp.getAddress();
        byte[] data = dp.getData();
        int length = dp.getLength();
        //輸出資料
        System.out.println("sender--> "+address.getHostAddress());
        System.out.println(new String(bys,0,length));
        //釋放資源
        ds.close();
    }
}