Java 最简单的UPD Server

package com.casic.test;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class AudioServer implements Runnable {
 
    DatagramSocket socket;
    DatagramPacket packet;// 从客户端接收到的UDP包
    DatagramPacket sendPkt;// 转发给另一个客户端的UDP包
 
    byte[] pktBuffer = new byte[1024];
    int bufferSize = 1024;
    boolean isRunning = false;
    int myport = 5656;
 
    int clientPort = 5757;
 
    public AudioServer() {
        try {
            socket = new DatagramSocket(myport);
            packet = new DatagramPacket(pktBuffer, bufferSize);
        } catch (SocketException e) {
            e.printStackTrace();
        }
        System.out.println("服务器初始化完成");
    }
 
    public void startServer() {
        this.isRunning = true;
        new Thread(this).start();
    }
 
    public void run() {
        try {
            while (isRunning) {
                socket.receive(packet);
                sendPkt = new DatagramPacket(packet.getData(),
                        packet.getLength(), packet.getAddress(), clientPort);
                socket.send(sendPkt);
                try {
                    Thread.sleep(20);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        } catch (IOException e) {
        }
    }
 
    // main
    public static void main(String[] args) {
        new AudioServer().startServer();
    }
}