udp協議發送消息案例

1、創建UdpServer（udp服務器端）

package com.cppdy.udp;

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

//udp服務器端
public class UdpServer {

    public static void main(String[] args) throws Exception {
        System.out.println("udp服務啟動……");
        DatagramSocket ds = new DatagramSocket(8080);

        
 
byte[] buf = new byte[1024];

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

        ds.receive(dp);

        String add = dp.getAddress().toString();

        String data = new String(dp.getData(), 0, dp.getLength());

        System.out.println("服務器接受：從IP" + add + "傳輸的數據：" + data);
    }

}
 

2、創建UdpClient（udp客戶端）

package com.cppdy.udp;

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

//udp客戶端
public class UdpClient {

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

        String msg = "吹泡泡的魚";
        DatagramSocket ds 
 
= new DatagramSocket();
        byte[] bytes = msg.getBytes();

        DatagramPacket dp = new DatagramPacket(bytes, bytes.length, new InetSocketAddress("127.0.0.1", 8080));

        ds.send(dp);

        ds.close();

        System.out.println("客戶端發送信息完畢……");
    }

}

Socket網絡編程（二）