1st Year Java Problem :( - Easy Im Sure :D

Ok,, thanks for reading.

What I want to do is to ?'thread'? and '?synchronise'? the Input and output sections so that i can run them indendently I also want to be able to send multiple lines - Does this involve writing to file? How will I begin and end the lines? Like is ther an if statement i can use to catch a double return or sumthing????

This is only a little bit of an overall project Im doing, so its not like i want u to do my coursework or anything.............well, it is really

// Server side of 2-person chat program.
//
// Server listens for request for connection on port 6789.
// When connection open, server reads a one-line message
// sent by client and displays it to the user.
// After each line from client, server waits for user
// to type a one-line reply, which it sends it to the client.
// Connection closed if either user types 'quit'.
// (19 Feb 2002)

import java.io.*;
import java.net.*;

public class Chat2Server

{  private static final int PORT = 6789;
      // Port number for connection.

   public static void main(String[] args)
   { 
      try
      {  /* Find the domain name (and address) of the host. */
         InetAddress host;
         try
         {  host = InetAddress.getLocalHost();
         }
         catch (UnknownHostException e)
         {  System.out.println
               ("Host not recognised. (Connected to Internet?)");
            return;
         }

         /* Listen on port 6789 for client requesting a connection. */
         ServerSocket listeningSocket = new ServerSocket(PORT);
         System.out.println("Server waiting on host " + host);
         Socket connectionSocket = listeningSocket.accept();
         System.out.println("Connected to client.");
         System.out.println("Wait for client to send message.\n" +
                            "Then send one-line reply.\n" +
                            "Repeat as often as you like.\n" +
                            "Enter 'bye' to finish.");

         /* Create input and output streams for the socket. */
         BufferedReader inFromClient =
            new BufferedReader(
               new InputStreamReader(
                  connectionSocket.getInputStream()));
         BufferedWriter outToClient =
            new BufferedWriter(
               new OutputStreamWriter(
                  connectionSocket.getOutputStream()));
         BufferedReader keyboard =
            new BufferedReader(new InputStreamReader(System.in));

         while(true)
         {  /* Read message from client and display to user. */
            String line1 = inFromClient.readLine();
            System.out.println("Received from client: " + line1);
            if (line1.equalsIgnoreCase("Bye"))
               break;

            /* Read message from user, and send it to client. */
            System.out.print("Send to client: ");
            String line2 = keyboard.readLine();
            outToClient.write(line2 + "\r\n");
            outToClient.flush();
            if (line2.equalsIgnoreCase("bye"))
               break;
         } // end while

         /* Close down. */
         connectionSocket.close();
         listeningSocket.close();
         System.out.println("\nClosing down.");
         return;
      } // end try

      catch (IOException e)
      {  System.out.println("Input/output error: " + e);
         return;
      }
   } // end main
}

Hobbes

try reading up on Threads.

http://java.sun.com/docs/books/tutorial/essential/threads/index.html

phobos

For a multithreaded server in Java, what I recommend you do is write a listening class, and a handling class. Let me explain.

The listening class will have the ServerSocket object waiting for the accept event to be triggered.

// Listening Class
ServerSocket ss = new ServerSocket(1234);

while(true){
        new HandlingThread(ss.accept()).start();
       
}

The HandlingThread is a class that extends Thread, and performs independent functions on behalf of a client connection.

;-phobos-)