Java Socket UDP编程

 1 package com;
 2 
 3 import java.io.IOException;
 4 import java.net.*;
 5 
 6 /**
 7  * UDP Client
 8  *
 9  * Created by Administrator on 2018/5/3.
10  */
11 public class Client {
12 
13     public static void main(String[] args) throws IOException {
14 
15         /**
16          * send message
17          */
18         InetAddress inetAddress = InetAddress.getByName("localhost");
19         byte[] data = "name:tom, pwd:123".getBytes();
20         DatagramPacket datagramPacket = new DatagramPacket(data, data.length, inetAddress, 8800);
21         DatagramSocket datagramSocket = new DatagramSocket();
22         datagramSocket.send(datagramPacket);
23 
24         /**
25          * receive message
26          */
27         byte[] data2 = new byte[1024];
28         DatagramPacket datagramPacket1 = new DatagramPacket(data2, data2.length);
29         datagramSocket.receive(datagramPacket1);
30         String info = new String(data2, 0, data2.length);
31         System.out.println("I am Client, Server say:" + info);
32 
33         /**
34          * close resource
35          */
36         datagramSocket.close();
37     }
38 }

 1 package com;
 2 
 3 import java.io.IOException;
 4 import java.net.DatagramPacket;
 5 import java.net.DatagramSocket;
 6 import java.net.InetAddress;
 7 
 8 /**
 9  * UDP Server
10  *
11  * Created by Administrator on 2018/5/3.
12  */
13 public class Server {
14 
15     public static void main(String[] args) throws IOException {
16 
17         DatagramSocket datagramSocket = new DatagramSocket(8800);
18 
19         /**
20          * receive message
21          */
22         byte[] bytes = new byte[1024];
23         DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length);
24         datagramSocket.receive(datagramPacket);
25         String info = new String(bytes, 0, datagramPacket.getLength());
26         System.out.println("I am Server, Client say: " + info);
27 
28         /**
29          * send message
30          */
31         InetAddress inetAddress = datagramPacket.getAddress();
32         int port = datagramPacket.getPort();
33         byte[] data = "welcome!".getBytes();
34         DatagramPacket datagramPacket1 = new DatagramPacket(data, data.length, inetAddress, port);
35         datagramSocket.send(datagramPacket1);
36 
37         /**
38          * close resource
39          */
40         datagramSocket.close();
41     }
42 }