1 package com.yyq;
2
3 import java.io.BufferedReader;
4 import java.io.InputStream;
5 import java.io.InputStreamReader;
6 import java.net.DatagramPacket;
7 import java.net.DatagramSocket;
8 import java.net.InetAddress;
9 import java.net.SocketException;
10
11 /*
12 * 编写一个聊天程序。有收数据的部分，有发送数据的部分，这两部分需要同时执行
13 * 那就需要用到多线程技术。一个线程收，一个线程发。
14 * 因为收和发动作是不一致的，所以
15 */
16 class Send implements Runnable{
17 private DatagramSocket ds;
18 public Send(DatagramSocket ds){
19 this.ds = ds;
20 }
21 public void run(){
22 try{
23 BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
24 String line = null;
25 while((line = bufr.readLine())!=null){
26 if("88".equals(line)){
27 break;
28 }
29 else{
30 byte[] buf = new byte[1024];
31 DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getLocalHost(),1237);
32 ds.send(dp);
33 }
34 }
35 }
36 catch(Exception e){
37 throw new RuntimeException("发送端失败！！");
38 }
39 }
40 }
41 class Rece implements Runnable{
42 private DatagramSocket ds;
43 public Rece(DatagramSocket ds){
44 this.ds = ds;
45 }
46 public void run(){
47 try{
48 while(true){
49 byte[] buf = new byte[1024];
50 DatagramPacket dp = new DatagramPacket(buf,buf.length);
51 ds.receive(dp);
52 String ip = dp.getAddress().getHostAddress();
53 String data = new String(dp.getData(),0,dp.getLength());
54 System.out.println(ip+data);
55 }
56 }
57 catch(Exception e){
58 throw new RuntimeException("接受端失败！！");
59 }
60 }
61 }
62 public class ChatDemo {
63 public static void main(String[] args) throws SocketException {
64 DatagramSocket sendSocket = new DatagramSocket();
65 DatagramSocket receSocket = new DatagramSocket(1237);
66 new Thread(new Rece(sendSocket)).start();
67 new Thread(new Send(sendSocket)).start();
68 }
69 }
