1. 服務器端

package com.machuang.udp;

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

public class ServerUdp {

    public static void main(String[] args) throws IOException {
        DatagramSocket server = new DatagramSocket(8888);
        
        
 
byte[] container = new byte[1024];
        DatagramPacket packet = new DatagramPacket(container, container.length);
        
        server.receive(packet);
        
        byte[] receiveData = packet.getData();
        int len = packet.getLength();
        System.out.println(new String(receiveData, 0, len));
        
        server.close();

    }

}
 

2. 客戶端

package com.machuang.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class ClientUdp {

    public static void main(String[] args) throws IOException {
        DatagramSocket client 
 
= new DatagramSocket(6666);
        
        String msg = "請求連接服務器";
        byte[] msgBytes = msg.getBytes();
        
        DatagramPacket packet = 
                new DatagramPacket(msgBytes, msgBytes.length,  new InetSocketAddress("localhost", 8888));
        
        client.send(packet);
        
        client.close();
        
        
    }

}

java建立UDP連接