Irregular messaging between server and telnet client.

[rewati raman]

Hi
I have made a server program that can be used to chat with a telnet client. Here is the code. There is a problem with it.
the message between server and client is irregular and i am not able to understand it. I am attaching the output below.

 

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;


public class EchoServer {
	public static void main(String arg[]){
		try{
			int i =1;
			ServerSocket s = new ServerSocket(63400);
			
			while(true){
				Socket incoming = s.accept();
				System.out.println();
				Runnable r = new ThreadHandler(incoming, i);
				Thread t = new Thread(r);
				t.start();
				i++;
			}
		}
		catch (IOException e){
			e.printStackTrace();
		}
	}

}

class ThreadHandler implements Runnable {

	private Socket incoming;
	public ThreadHandler(Socket i, int c) {
		incoming = i;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		try {
			try{
				InputStream inStream = incoming.getInputStream();
				OutputStream outStream = incoming.getOutputStream();
				Scanner in = new Scanner(inStream);
				Scanner inn = new Scanner(System.in);
				PrintWriter out = new PrintWriter(outStream, true);
				out.println();
				while(in.hasNextLine()||inn.hasNextLine()){
					
					out.println(inn.nextLine());
					System.out.println(in.nextLine());
				}
			}
			finally{
				incoming.close();
			}
		}
		catch (IOException e){
			e.printStackTrace();
		}
		
	}

	
}
   

 


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[Andrey Kozhanov]

Hi!

Your problem is on 52nd line of code. It is said in java documentation:

public boolean hasNextLine()
Returns true if there is another line in the input of this scanner. This method may block while waiting for input.

This is exactly what happening with your server - it's execution does not proceed until user enters something on server side.