java建立UDP连接

1. 服务器端

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. 客户端

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 = "请求连接服务器";
        byte[] msgBytes = msg.getBytes();

        DatagramPacket packet =
                new DatagramPacket(msgBytes, msgBytes.length,  new InetSocketAddress("localhost", 8888));

        client.send(packet);

        client.close();

    }

}

原文地址：https://www.cnblogs.com/cappuccinom/p/8805310.html