Odtnhj

I'm trying to do the follow :

calculate the running time of my device all the time and and whenever a client connect he will show it to him , until he disconnet.

how do to this ?

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.concurrent.TimeUnit;

public class MyServer 
 public static void main(String args) 
 connectToServer();
 

 static Calendar startTime = Calendar.getInstance();
 static long StartTime = System.currentTimeMillis();

 public static void connectToServer() 
 try(ServerSocket serverSocket = new ServerSocket(9991)) 
 Socket connectionSocket = serverSocket.accept();
 InputStream inputToServer = connectionSocket.getInputStream();
 OutputStream outputFromServer = connectionSocket.getOutputStream();
 Scanner scanner = new Scanner( inputToServer, "UTF-8" );
 PrintWriter serverPrintOut = new PrintWriter(
 new OutputStreamWriter( outputFromServer, "UTF-8" ), true );
 serverPrintOut.println("Welcome to time server ");
 while(true) 
 long EndTime = System.currentTimeMillis();
 long Total = EndTime - StartTime;
 serverPrintOut.println(Total);
 System.out.println(Total);
 try 
 Thread.sleep(1000);
 
 catch(InterruptedException ex) 
 Thread.currentThread().interrupt();
 
 
 catch (IOException e) 
 e.printStackTrace();
 
 

but he only start show me the time when a user is connected

why?

Server Code:

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Calendar;

class ClientThread extends Thread 

 private final Socket _socket;

 public ClientThread( Socket socket ) 
 System.out.println( "New client" );
 _socket = socket;
 setDaemon( true );
 start();
 

 @Override
 public void run() 
 try(
 final OutputStream outputFromServer = _socket.getOutputStream();
 final PrintWriter serverPrintOut = new PrintWriter(
 new OutputStreamWriter( outputFromServer, "utf-8" ), true ))
 
 serverPrintOut.println( "Welcome to time server" );
 for(;;) 
 final long elapsed = System.currentTimeMillis() - MyServer.StartTime;
 serverPrintOut.println( elapsed );
 Thread.sleep( 1000L );
 
 
 catch( final InterruptedException ex) /**/
 catch( final IOException e ) 
 e.printStackTrace();
 
 


public class MyServer 

 static Calendar startTime = Calendar.getInstance();
 static long StartTime = System.currentTimeMillis();

 public static void main( String args ) throws IOException 
 try( ServerSocket serverSocket = new ServerSocket( 9991 )) 
 for(;;) 
 new ClientThread( serverSocket.accept());
 
 
 

Client code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

public class MyClient 

 public static void main( String args ) throws IOException 
 try(
 Socket socket = new Socket( args[0], 9991 );
 BufferedReader br = new BufferedReader(
 new InputStreamReader( socket.getInputStream(), "utf-8" )))
 
 String line;
 while(( line = br.readLine()) != null ) 
 System.out.println( line );
 
 
 

Output, server side:

$ java -cp bin so.MyServer 
New client
New client

Output, client side:

$ java -cp bin so.MyClient localhost
Welcome to time server
3274
4274
5275
6275
7275
8276
9276
10276
11276
^C <---- End of first client

$ java -cp bin so.MyClient localhost
Welcome to time server
19838
20838
21838
^C <---- End of second client