基于UDP的socket 客户端和服务端

基于UDP协议的socket 客户端和服务端

/**
 * @author Mr.zhang
 * 基于 UDP 协议的 socket 客户端和服务端 
 */
package com.datagram.socket;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DatagramSocketServerClient {
static DatagramSocket server = null;//全局的 socket,用于客户端发送数据包和服务端接收

/**
 * 服务端,监听端口,当收到数据时,实例化一个新数据包,并返回
 * @author Mr.zhang
 *
 */
    class Server implements Runnable {
private Integer port;
byte [] bytes = new byte[1024];
public Server (Integer port) {
this.port = port;
        }

@Override
public void run() {

            SimpleDateFormat sdf = null;
try {
                server = new DatagramSocket(this.port);
                DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length);
while (server != null) {//监听端口
                    server.receive(packet);//接收数据包
                    String revice = new String(packet.getData(),0,packet.getLength());//将数据包转为字符串
                    System.out.println("服务端接收时间为：" + revice);
                    System.out.println("客户端主机地址为：" + packet.getAddress().getHostAddress() + " 端口为：" + packet.getPort());
                    sdf = new SimpleDateFormat("HH:mm:ss");
                    String nowTime = sdf.format(new Date());
                    bytes = nowTime.getBytes();
// 这里可以直接返回接收到的数据包,我这里重新实例化一个数据包返回
                    server.send(new DatagramPacket(bytes, bytes.length, InetAddress.getByName(packet.getAddress().getHostAddress()), packet.getPort()));
                }
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

/**
 * 客户端,发送数据包到服务端,并接收服务端返回的数据包
 * @author Mr.zhang
 *
 */
    class Client implements Runnable {
private String host;
private Integer port;
byte [] bytes = new byte[1024];
public Client (String host , Integer port) {
this.host = host;
this.port = port;
        }

@Override
public void run() {
            SimpleDateFormat sdf = null;
            DatagramPacket packet = null;
try {
                sdf = new SimpleDateFormat("HH:mm:ss");
                String nowTime = sdf.format(new Date());
                bytes = nowTime.getBytes("utf-8");
                packet = new DatagramPacket(bytes, bytes.length, InetAddress.getByName(this.host), this.port);
                server.send(packet);
                server.receive(packet );
                System.out.println("服务端返回:"+new String(packet.getData(),0,packet.getLength()));
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }


public static void main(String[] args) throws InterruptedException {
new Thread (new DatagramSocketServerClient().new Server(3980)).start();
        Thread.sleep(1000);
new Thread (new DatagramSocketServerClient().new Client("127.0.0.1", 3980)).start();
    }


}