Java Socket实战之二 多线程通信 .

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。具体代码如下：

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();}}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。