Java Socket实战之二 多线程通信

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。具体代码如下：[java] view plaincopyprint?1.package com.googlecode.garbagecan.test.socket.sample2;  2.  3.import java.io.BufferedReader;  4.import java.io.IOException;  5.import java.io.InputStreamReader;  6.import java.io.PrintWriter;  7.import java.net.ServerSocket;  8.import java.net.Socket;  9.  10.public class MyServer {  11.    public static void main(String[] args) throws IOException {  12.        ServerSocket server = new ServerSocket(10000);  13.          14.        while (true) {  15.            Socket socket = server.accept();  16.            invoke(socket);  17.        }  18.    }  19.      20.    private static void invoke(final Socket client) throws IOException {  21.        new Thread(new Runnable() {  22.            public void run() {  23.                BufferedReader in = null;  24.                PrintWriter out = null;  25.                try {  26.                    in = new BufferedReader(new InputStreamReader(client.getInputStream()));  27.                    out = new PrintWriter(client.getOutputStream());  28.  29.                    while (true) {  30.                        String msg = in.readLine();  31.                        System.out.println(msg);  32.                        out.println("Server received " + msg);  33.                        out.flush();  34.                        if (msg.equals("bye")) {  35.                            break;  36.                        }  37.                    }  38.                } catch(IOException ex) {  39.                    ex.printStackTrace();  40.                } finally {  41.                    try {  42.                        in.close();  43.                    } catch (Exception e) {}  44.                    try {  45.                        out.close();  46.                    } catch (Exception e) {}  47.                    try {  48.                        client.close();  49.                    } catch (Exception e) {}  50.                }  51.            }  52.        }).start();  53.    }  54.}  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：[java] view plaincopyprint?1.package com.googlecode.garbagecan.test.socket.sample2;  2.  3.import java.io.BufferedReader;  4.import java.io.InputStreamReader;  5.import java.io.PrintWriter;  6.import java.net.Socket;  7.  8.public class MyClient {  9.    public static void main(String[] args) throws Exception {  10.        Socket socket = new Socket("localhost", 10000);  11.        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));  12.        PrintWriter out = new PrintWriter(socket.getOutputStream());  13.        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));  14.  15.        while (true) {  16.            String msg = reader.readLine();  17.            out.println(msg);  18.            out.flush();  19.            if (msg.equals("bye")) {  20.                break;  21.            }  22.            System.out.println(in.readLine());  23.        }  24.        socket.close();  25.    }  26.}  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();}} 测试，首先运行MyServer类，然后运行两个MyClient类，然后分别在每个MyClient的提示符下输入字符串，就可以看到Server可以分别接收处理每个Client的请求了。