Java基础知识强化之网络编程笔记05：UDP之多线程实现聊天室案例

1. 通过多线程改进刚才的聊天程序，这样我就可以实现在一个窗口发送和接收数据了

2.  代码示例：

（1）SendThread.java，如下：

 package com.himi.udpDemo2;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.DatagramPacket;
 import java.net.DatagramSocket;
 import java.net.InetAddress;

 public class SendThread implements Runnable {

     private DatagramSocket ds;

     public SendThread(DatagramSocket ds) {
         this.ds = ds;
     }

     public void run() {
         try {
             // 封装键盘录入数据
             BufferedReader br = new BufferedReader(new InputStreamReader(
                     System.in));
             String line = null;
             while ((line = br.readLine()) != null) {
                 if ("886".equals(line)) {
                     break;
                 }

                 // 创建数据并打包
                 byte[] bys = line.getBytes();
                 // DatagramPacket dp = new DatagramPacket(bys, bys.length,
                 // InetAddress.getByName("192.168.12.92"), 12345);
                 DatagramPacket dp = new DatagramPacket(bys, bys.length,
                         InetAddress.getByName("49.123.72.145"), 12306);

                 // 发送数据
                 ds.send(dp);
             }

             // 释放资源
             ds.close();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }

 }

（2）ReceiveThread.java，如下：

 package com.himi.udpDemo2;

 import java.io.IOException;
 import java.net.DatagramPacket;
 import java.net.DatagramSocket;

 public class ReceiveThread implements Runnable {
     private DatagramSocket ds;

     public ReceiveThread(DatagramSocket ds) {
         this.ds = ds;
     }

     public void run() {
         try {
             while (true) {
                 // 创建一个包裹
                 byte[] bys = new byte[1024];
                 DatagramPacket dp = new DatagramPacket(bys, bys.length);

                 // 接收数据
                 ds.receive(dp);

                 // 解析数据
                 String ip = dp.getAddress().getHostAddress();
                 String s = new String(dp.getData(), 0, dp.getLength());
                 System.out.println("from " + ip + " data is : " + s);
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
     }

 }

（3）聊天室程序CharRoom.java，调用上面两个线程工具类，代码如下:

 package com.himi.udpDemo2;

 import java.io.IOException;
 import java.net.DatagramSocket;

 /*
  * 通过多线程改进刚才的聊天程序，这样我就可以实现在一个窗口发送和接收数据了
  */
 public class ChatRoom {
     public static void main(String[] args) throws IOException {
         DatagramSocket dsSend = new DatagramSocket();
         DatagramSocket dsReceive = new DatagramSocket(12306);

         SendThread st = new SendThread(dsSend);
         ReceiveThread rt = new ReceiveThread(dsReceive);

         Thread t1 = new Thread(st);
         Thread t2 = new Thread(rt);

         t1.start();
         t2.start();
     }
 }

运行效果如下：