Multithreaded server Consider the following source code for a simple time of day

Question

Multithreaded server Consider the following source code for a simple time of day server. public class Daytime server (public static void main (String [] args) while (true) Socket client Socket - server socket - accepts(); Print writer - new print water while (true0 string time stamp = new simple date forward format (new date ()); writer, print in (time stamp0; if(writer, check error9))//we couldn't write, meaning the break; thread, sleep (5000); writer, close (); client socket, close(); When a client connect date and time on the client every 5 seconds. The server, as given can only handle one client at a time. Write a multithreaded version of this server that can handle multiple clients are the same time you may ignore exception handling in your solution.

Explanation / Answer

I had written & compiled the code for you as per your specifications. You need to add one more file which will extend Thread class. Your server class will create a thread of this class for every client. Your logic will be kept inside this class's run() method.

So every time a client connects to the server, a new thread is created for it which will do the assigned work.

Below is the code for your reference :

DayTimeServer.java

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class DayTimeServer {

   public static void main(String[] args) throws IOException {
      
       ServerSocket serverSocket = null;

   boolean listeningSocket = true;
   try {
   serverSocket = new ServerSocket(13000);
   } catch (IOException e) {
   System.err.println("Could not listen on port: 2343");
   }

   while(listeningSocket)
   {
   Socket clientSocket = serverSocket.accept();
   ServerHelper helper = new ServerHelper(clientSocket);
   helper.start();
   }
   serverSocket.close();   

   }

}

=======================================================

ServerHelper.java

import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;

public class ServerHelper extends Thread{
  
   private Socket socket = null;

   public ServerHelper(Socket socket)
   {
       super("MiniServer");
   this.socket = socket;
   }

   @Override
   public void run()
   {
       PrintWriter writer=null;
      
       try {
           writer= new PrintWriter(socket.getOutputStream(),true);
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
      
       while(true)
       {
           String pattern = "yyyy-MM-dd";
           String timeStamp = new SimpleDateFormat(pattern).format(new Date());
           writer.println(timeStamp);
           if(writer.checkError())
           {
               System.out.println("Error: couldn't write");
               break;
           }
           try {
               Thread.sleep(5000);
           } catch (InterruptedException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       writer.close();
       try {
           socket.close();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }
  
  
}

feel free to ask if you have any doubt :)

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