java socket 怎么运行_Java Socket如何实现多线程通信

前面的文章《Java Socket实现单线程通信的方法示例》说到怎样写一个最简单的Java Socket通信，但是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。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。