Java Socket實戰之二 多線程通信

上一篇文章說到怎樣寫一個最簡單的Java Socket通信，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連接後就佔據了這個位置，後續Client不能再繼續連接，所以需要做些改動，當Server沒接受到一個Client連接請求之後，都把處理流程放到一個獨立的線程裏去運行，然後等待下一個Client連接請求，這樣就不會阻塞Server端接收請求了。每個獨立運行的程序在使用完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程序代碼：

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的提示符下輸入字符串，就可以看到Server可以分別接收處理每個Client的請求了。

轉載於http://blog.csdn.net/kongxx/article/details/7259465

專欄：http://blog.csdn.net/column/details/javasocketinaction.html