Java Socket實戰之二 多線程通訊

本文地址：http://blog.csdn.net/kongxx/article/details/7259465

Java Socket實戰之一 單線程通訊

上一篇文章說到怎樣寫一個最簡單的Java Socket通訊，但是在上一篇文章中的例子有一個問題就是Server只能接受一個Client請求，當第一個Client串連後就佔據了這個位置，後續Client不能再繼續串連，所以需要做些改動，當Server沒接受到一個Client串連請求之後，都把處理流程放到一個獨立的線程裡去運行，然後等待下一個Client串連請求，這樣就不會阻塞Server端接收請求了。每個獨立啟動並執行程式在使用完Socket對象之後要將其關閉。具體代碼如下：

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程式碼：

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();}}

測試，首先運行MyServer類，然後運行兩個MyClient類，然後分別在每個MyClient的提示符下輸入字串，就可以看到Server可以分別接收處理每個Client的請求了。