(转)多线程Java Socket编程示例

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http://www.blogjava.net/sterning/archive/2007/10/15/152940.html

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????????????????????????????????????????? 多线程Java Socket编程示例

这篇做为学习孙卫琴<<Java网络编程精解>>的学习笔记吧.其中采用Java 5的ExecutorService来进行线程池的方式实现多线程,模拟客户端多用户向同一服务器端发送请求.

1.服务端

package?sterning;

import?java.io.BufferedReader;
import?java.io.IOException;
import?java.io.InputStream;
import?java.io.InputStreamReader;
import?java.io.OutputStream;
import?java.io.PrintWriter;
import?java.net.*;
import?java.util.concurrent.*;

public?class?MultiThreadServer?{
????private?int?port=8821;
????private?ServerSocket?serverSocket;
????private?ExecutorService?executorService;//线程池
????private?final?int?POOL_SIZE=10;//单个CPU线程池大小
????
????public?MultiThreadServer()?throws?IOException{
????????serverSocket=new?ServerSocket(port);
????????//Runtime的availableProcessor()方法返回当前系统的CPU数目.
????????executorService=Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()*POOL_SIZE);
????????System.out.println("服务器启动");
????}
????
????public?void?service(){
????????while(true){
????????????Socket?socket=null;
????????????try?{
????????????????//接收客户连接,只要客户进行了连接,就会触发accept();从而建立连接
????????????????socket=serverSocket.accept();
????????????????executorService.execute(new?Handler(socket));
????????????????
????????????}?catch?(Exception?e)?{
????????????????e.printStackTrace();
????????????}
????????}
????}
????
????public?static?void?main(String[]?args)?throws?IOException?{
????????new?MultiThreadServer().service();
????}

}

class?Handler?implements?Runnable{
????private?Socket?socket;
????public?Handler(Socket?socket){
????????this.socket=socket;
????}
????private?PrintWriter?getWriter(Socket?socket)?throws?IOException{
????????OutputStream?socketOut=socket.getOutputStream();
????????return?new?PrintWriter(socketOut,true);
????}
????private?BufferedReader?getReader(Socket?socket)?throws?IOException{
????????InputStream?socketIn=socket.getInputStream();
????????return?new?BufferedReader(new?InputStreamReader(socketIn));
????}
????public?String?echo(String?msg){
????????return?"echo:"+msg;
????}
????public?void?run(){
????????try?{
????????????System.out.println("New?connection?accepted?"+socket.getInetAddress()+":"+socket.getPort());
????????????BufferedReader?br=getReader(socket);
????????????PrintWriter?pw=getWriter(socket);
????????????String?msg=null;
????????????while((msg=br.readLine())!=null){
????????????????System.out.println(msg);
????????????????pw.println(echo(msg));
????????????????if(msg.equals("bye"))
????????????????????break;
????????????}
????????}?catch?(IOException?e)?{
????????????e.printStackTrace();
????????}finally{
????????????try?{
????????????????if(socket!=null)
????????????????????socket.close();
????????????}?catch?(IOException?e)?{
????????????????e.printStackTrace();
????????????}
????????}
????}
}

2.客户端

package?sterning;

import?java.io.BufferedReader;
import?java.io.IOException;
import?java.io.InputStreamReader;
import?java.io.OutputStream;
import?java.net.Socket;
import?java.util.concurrent.ExecutorService;
import?java.util.concurrent.Executors;

public?class?MultiThreadClient?{
????
????public?static?void?main(String[]?args)?{
????????int?numTasks?=?10;
????????
????????ExecutorService?exec?=?Executors.newCachedThreadPool();

????????for?(int?i?=?0;?i?<?numTasks;?i++)?{
????????????exec.execute(createTask(i));
????????}

????}

????//?定义一个简单的任务
????private?static?Runnable?createTask(final?int?taskID)?{
????????return?new?Runnable()?{
????????????private?Socket?socket?=?null;
????????????private?int?port=8821;

????????????public?void?run()?{
????????????????System.out.println("Task?"?+?taskID?+?":start");
????????????????try?{????????????????????
????????????????????socket?=?new?Socket("localhost",?port);
????????????????????//?发送关闭命令
????????????????????OutputStream?socketOut?=?socket.getOutputStream();
????????????????????socketOut.write("shutdown\r\n".getBytes());

????????????????????//?接收服务器的反馈
????????????????????BufferedReader?br?=?new?BufferedReader(
????????????????????????????new?InputStreamReader(socket.getInputStream()));
????????????????????String?msg?=?null;
????????????????????while?((msg?=?br.readLine())?!=?null)
????????????????????????System.out.println(msg);
????????????????}?catch?(IOException?e)?{????????????????????
????????????????????e.printStackTrace();
????????????????}
????????????}

????????};
????}
}

从而实现了多个客户端向服务器端发送请求,服务器端采用多线程的方式来处理的情况.再结合我之前的例子---Java基于Socket文件传输示例,就可以实现多线程文件的传输了