Java Socket实战之二：多线程通信

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转自：http://developer.51cto.com/art/201202/317544.htm

上一篇文章说到怎样写一个最简单的Java Socket通信，但是在上一篇文章中的例子有一个问题就是Server只能接受一个Client请求，当第一个Client连接后就占据了这个位置，后续Client不能再继续连接，所以需要做些改动，当Server没接受到一个Client连接请求之后，都把处理流程放到一个独立的线程里去运行，然后等待下一个Client连接请求，这样就不会阻塞Server端接收请求了。每个独立运行的程序在使用完Socket对象之后要将其关闭。

 package com.googlecode.garbagecan.test.socket.sample2;  

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStreamReader;

 import java.io.PrintWriter;

 import java.net.ServerSocket;

 import java.net.Socket;  

 public class MyServer {

     public static void main(String[] args) throws IOException {

         ServerSocket server = new ServerSocket(10000);  

         while (true) {

             Socket socket = server.accept();

             invoke(socket);

         }

     }  

     private static void invoke(final Socket client) throws IOException {

         new Thread(new Runnable() {

             public void run() {

                 BufferedReader in = null;

                 PrintWriter out = null;

                 try {

                     in = new BufferedReader(new InputStreamReader(client.getInputStream()));

                     out = new PrintWriter(client.getOutputStream());  

                     while (true) {

                         String msg = in.readLine();

                         System.out.println(msg);

                         out.println("Server received " + msg);

                         out.flush();

                         if (msg.equals("bye")) {

                             break;

                         }

                     }

                 } catch(IOException ex) {

                     ex.printStackTrace();

                 } finally {

                     try {

                         in.close();

                     } catch (Exception e) {}

                     try {

                         out.close();

                     } catch (Exception e) {}

                     try {

                         client.close();

                     } catch (Exception e) {}

                 }

             }

         }).start();

     }

 }

下面是Client程序代码：

 package com.googlecode.garbagecan.test.socket.sample2;  

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 import java.io.PrintWriter;

 import java.net.Socket;  

 public class MyClient {

     public static void main(String[] args) throws Exception {

         Socket socket = new Socket("localhost", 10000);

         BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

         PrintWriter out = new PrintWriter(socket.getOutputStream());

         BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));  

         while (true) {

             String msg = reader.readLine();

             out.println(msg);

             out.flush();

             if (msg.equals("bye")) {

                 break;

             }

             System.out.println(in.readLine());

         }

         socket.close();

     }

 }