服务端的线程池方案2

　　Java提供了一个很好地类来实现1中的线程池功能就是Executors类。将服务端代码改变一下就OK了。当然了，ReceiveFile类还需要改变一下（实现一个Runnable接口，并将receiveFile方法的内容写到run方法中，删除receiveFile方法即可）。

package com.wjy.threadpool;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.*;

import com.wjy.receivefile.ReceiveFile;

public class ThreadPool {
    private int port;
    private int poolSize=0;
    private ServerSocket server;
    
    
    public ThreadPool(int port, int poolSize) {
        super();
        this.port = port;
        this.poolSize = poolSize;
    }

    private void startServer(){
        try {
            server=new ServerSocket(port);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    private int fileNum(){
        int result=(int)(Math.random()*10);
        return result;
    }
    public void startThreadPool(){
        startServer();
        Executor service=Executors.newCachedThreadPool();
        while(true){
            try {
                Socket client=server.accept();
                int num=fileNum();
                System.out.println(num);
                BufferedInputStream inputStream=new BufferedInputStream(client.getInputStream());
                
                Thread.sleep(15000);
                service.execute(new ReceiveFile(inputStream, "E://receive/"+num+".txt"));
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
        }
//        for(int i=0;i<poolSize;i++){
//            Thread thread=new Thread(){
//                public void run(){
//                    while(true){
//                        try {
//                            Socket client=server.accept();
//                            int num=fileNum();
//                            System.out.println(num);
//                            BufferedInputStream inputStream=new BufferedInputStream(client.getInputStream());
//                            ReceiveFile receiveFile=new ReceiveFile(inputStream, "E://receive/"+num+".txt");
//                            Thread.sleep(15000);
//                            receiveFile.receiveFile();
//                        } catch (Exception e) {
//                            e.printStackTrace();
//                        }
//                    }
//                }
//            };
//            thread.start();
//        }
    }
}

接受文件的类：

package com.wjy.receivefile;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class ReceiveFile implements Runnable{

    private int buffSize=1024;
    private BufferedInputStream conveyInputStream;
    private BufferedOutputStream fileOutputStream;
    
    public void setBuffSize(int buffSize) {
        this.buffSize = buffSize;
    }

    public ReceiveFile(BufferedInputStream conveyInputStream, String filePath) {
        super();
        this.conveyInputStream = conveyInputStream;
        try {
            this.fileOutputStream=new BufferedOutputStream(new FileOutputStream(new File(filePath)));
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
//    public void receiveFile(){
//        byte buff[]=new byte[buffSize];
//        try {
//            while((conveyInputStream.read(buff, 1, buffSize-1))!=-1){
//                fileOutputStream.write(buff, 1, buffSize-1);
//            }
//            conveyInputStream.close();
//            fileOutputStream.close();
//        } catch (IOException e) {
//            // TODO Auto-generated catch block
//            e.printStackTrace();
//        }
//    }

    @Override
    public void run() {
        // TODO Auto-generated method stub

        byte buff[]=new byte[buffSize];
        try {
            while((conveyInputStream.read(buff, 1, buffSize-1))!=-1){
                fileOutputStream.write(buff, 1, buffSize-1);
            }
            conveyInputStream.close();
            fileOutputStream.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
    }
    

}