关于java客户机多线程问题，如何将一个单线程的改变为多线程

C_amateur 2015-10-25 05:27:06

这是《自顶向下》书里的一个例子，实现功能是客户机输入一个字母后，服务器将其变为大写，并返回给客户机。
我将这个服务器改编为多线程。大家看有什么问题，或者帮我改写一个多线程，我对照研究一下
原服务器代码：

package tcpserver;

import java.io.*;

import java.net.*;

public class TCPServer {

    public static void main(String[] argv) throws IOException {

        String clientSentence;

        String capitalizedSentence;

        ServerSocket welcomeSocket = new ServerSocket(80);

        while(true){

            Socket connectionSocket = welcomeSocket.accept();

            BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));

            DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());

            clientSentence = inFromClient.readLine();

        

            capitalizedSentence = clientSentence.toUpperCase()+'\n';

            outToClient.writeBytes(capitalizedSentence);

        }

    }

    

}

改变为多线程后：

package threadedserver;

import java.io.*;  

import java.util.*;  

import java.net.*; 

import java.util.logging.Level;

import java.util.logging.Logger;



class Handler implements Runnable {

    Socket welcomeSocket;

    String clientSentence;

    String capitalizedSentence;

    public Handler(Socket s) throws IOException {

    Thread t;

    welcomeSocket = s;

    ServerSocket welcomeSocket = new ServerSocket(80);

    t = new Thread(this, "Handler Thread");

    t.start();

    }

    public void run() {

        while(true){

            try {

                

                Socket connectionSocket = welcomeSocket.accept();

                BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));

                DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());

                clientSentence = inFromClient.readLine();

                capitalizedSentence = clientSentence.toUpperCase()+'\n';

                outToClient.writeBytes(capitalizedSentence);

            } catch (IOException ex) {

                Logger.getLogger(Handler.class.getName()).log(Level.SEVERE, null, ex);

            }

        }

    }

}



public class ThreadedServer extends Thread {





    public static void main(String[] args) {



        Handler sever=new Handler();

    }

    

}