1 package day12.lesson2.p1;
2
3 import java.io.BufferedReader;
4 import java.io.FileReader;
5 import java.io.IOException;
6 import java.io.InputStreamReader;
7 import java.net.DatagramPacket;
8 import java.net.DatagramSocket;
9 import java.net.InetAddress;
10 import java.net.SocketException;
11
12 /*
13 2.3 案例-UDP通信程序
14
15 UDP发送数据：数据来自于键盘录入，直到输入的数据是886，发送数据结束
16 UDP接收数据：因为接收端不知道发送端什么时候停止发送，故采用死循环接收
17
18 */
19 public class SendDemo {
20 public static void main(String[] args) throws IOException {
21 DatagramSocket ds = new DatagramSocket();
22
23 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
24 String line;
25 while ((line=br.readLine()) != null){
26 if("886".equals(line)){
27 break;
28 }
29
30 byte[] bytes = line.getBytes();
31 DatagramPacket dp = new DatagramPacket(
32 bytes,
33 bytes.length,
34 InetAddress.getByName("MSI-YUBABY"),
35 12345
36 );
37
38 ds.send(dp);
39 }
40
41 ds.close();
42 }
43 }
1 package day12.lesson2.p1;
2
3 import java.io.IOException;
4 import java.net.DatagramPacket;
5 import java.net.DatagramSocket;
6
7 public class ReceiveDemo {
8 public static void main(String[] args) throws IOException {
9 DatagramSocket ds = new DatagramSocket(12345);
10
11 while (true){
12 byte[] bytes = new byte[1024];
13 DatagramPacket dp = new DatagramPacket(bytes, bytes.length);
14
15 ds.receive(dp);
16
17 System.out.println("接收到的数据：" + new String(
18 dp.getData(),
19 0,
20 dp.getLength()
21 ));
22 }
23
24 // ds.close();
25 //启动一个ReceiveDemo-main，启动多个SendDemo-main，即可组成“聊天室”
26 }
27 }
