UDP编程

package com.zby;

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

public class Server {
    private static boolean running = true;

    public static void main(String[] args) throws Exception {
        DatagramSocket server = new DatagramSocket(8888);
        byte[] buffer = new byte[1024];
        DatagramPacket requestPacket = new DatagramPacket(buffer, buffer.length);
        while (running) {
            server.receive(requestPacket);
            String request = new String(requestPacket.getData(), 0, requestPacket.getLength());
            System.out.println("request:" + request);
            System.out.println("InetAddress:" + requestPacket.getAddress());
            System.out.println("port:" + requestPacket.getPort());
            System.out.println();

            String response = "Hello,Client!";
            DatagramPacket responsePacket = new DatagramPacket(response.getBytes(), response.getBytes().length,
                    requestPacket.getAddress(), requestPacket.getPort());
            server.send(responsePacket);
        }
        server.close();
    }

}

package com.zby;

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

public class Client {

    public static void main(String[] args) throws Exception {
        DatagramSocket client = new DatagramSocket(7777);
        String request = "Hello,Server!";
        DatagramPacket datagramPacket = new DatagramPacket(request.getBytes(), request.getBytes().length,
                InetAddress.getLocalHost(), 8888);
        client.send(datagramPacket);

        byte[] buffer = new byte[1024];
        DatagramPacket responsePacket = new DatagramPacket(buffer, buffer.length);

        client.receive(responsePacket);
        String response = new String(responsePacket.getData(), 0, responsePacket.getLength());
        System.out.println("response:" + response);
        System.out.println("InetAddress:" + responsePacket.getAddress());
        System.out.println("port:" + responsePacket.getPort());
        System.out.println();
        client.close();
    }

}