client/server question (beginner level)

Hi, below are two simple files. clientz is a client and serverz is the server.
I can read strings from the server but I want the server to also be able to read strings from the client (on the same port, in this program port no 5003). How to I go about this?. this is really wrecking my head, i just cant figure it out. Any help or suggestions to code/design would be great, thanks.

/*************************************clientz.java*********************************/import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.lang.*;

public class clientz extends Frame {
      TextArea display;
      
      public clientz(){
            super("clientz");
            display = new TextArea(20 , 10);
            add("Center" , display);
            resize(300 , 150);
            show();
      }
      
      public void runClient(){
            Socket client;
            InputStream input;
            //input.read();
            
            try{
                  
                  //receiving message from server      
                  client = new Socket(InetAddress.getLocalHost(),5003);
                  input = client.getInputStream();
                  display.appendText("\nCreated input Stream\n");
                  display.appendText("\nText from server is\n\t");
                  char c;
                  
                  while((c = (char) input.read() ) != '\n')
                        display.appendText(String.valueOf( c ));
            
                  display.appendText("\n");
                  client.close();
                  
                  //sending message to server
      
            }
            catch(IOException e) {
                  e.printStackTrace();
            }
      }
      
            public boolean handleEvent( Event e )
{
      if( e.id == Event.WINDOW_DESTROY ){
            hide();
            dispose();
            System.exit( 0 );
      }
      
      return super.handleEvent( e );
}

public static void main( String args[]){

      clientz c = new clientz();
      c.runClient();

}
}
/***********************************serverz.java*********************************************/
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;

public class serverz extends Frame{
      TextArea display;
      
      public serverz(){
            super("serverz");
            display = new TextArea(20 , 5);
            add("Center" , display);
            resize(300 , 150);
            show();
      }
      
      public void runserverz(){
      
      ServerSocket serve;
      Socket connection;
      OutputStream output;
      
      try{
            //sending message to client
            serve = new ServerSocket(5003 , 1000);
            connection = serve.accept();
            display.setText("\nConnection received");
            output = connection.getOutputStream();
            String s = new String("Has connected\n");
            
            for(int i = 0; i < s.length(); ++i)
                  output.write((int) s.charAt(i));
            
            display.appendText(
                  "\nSent message");
                  
            //receiving message from client
      
      }
      
      catch(IOException e){
            e.printStackTrace();
      }
}
      public boolean handleEvent( Event e )
{
      if( e.id == Event.WINDOW_DESTROY ){
            hide();
            dispose();
            System.exit( 0 );
      }
      
      return super.handleEvent( e );
}

public static void main(String args[]){
      serverz s = new serverz();
      s.runserverz();
}
}
eire_irelandAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

CEHJCommented:
You just need to get and use the output stream on the client and input stream on the server respectively. Don't forget to close them after use.
0
eire_irelandAuthor Commented:
Could you give me an example of this plz, pseudocode will do cos I was tryin something like that and it would'nt work... again thanks
0
CEHJCommented:
Show what you had and we'll try to correct it
0
Cloud Class® Course: CompTIA Cloud+

The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

eire_irelandAuthor Commented:
           //sending message to server
            Socket connection;
            OutputStream output = connection.getOutputStream();
            String s = new String("Has connected\n");
            
            for(int i = 0; i < s.length(); ++i)
                  output.write((int) s.charAt(i));

            OutputStream output = connection.getOutputStream();
                                      ^
--------------------Configuration: j2sdk1.4.0_02 <Default>--------------------
C:\Program Files\Xinox Software\JCreator Pro\MyProjects\clientz.java:41: variable connection might not have been initialized
            OutputStream output = connection.getOutputStream();
                                      ^
Process completed.
/**************************************************************/

Thats the error its giving.

If I initialize the connection again without specifying a different port number it throws an error specifying the port number is already in use.
Any ideas?



                  
0
CEHJCommented:
You can do this sort of thing:

import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.lang.*;

public class clientz extends Frame {
     TextArea display;

     public clientz(){
          super("clientz");
          display = new TextArea(20 , 10);
          add("Center" , display);
          resize(300 , 150);
          show();
     }

     public void runClient(){
          Socket client = null;
          InputStream input = null;
          //input.read();
          PrintWriter output = null;

          try{

               //receiving message from server
               client = new Socket(InetAddress.getLocalHost(),5003);
               input = client.getInputStream();
               display.appendText("\nCreated input Stream\n");
               display.appendText("\nText from server is\n\t");
               char c;

               while((c = (char) input.read() ) != '\n')
                    display.appendText(String.valueOf( c ));

               display.appendText("\n");

               //sending message to server
               output = new PrintWriter(new OutputStreamWriter(client.getOutputStream()), true);
               String message = "Client to Server!";
               output.println(message);

          }
          catch(IOException e) {
               e.printStackTrace();
          }
          finally {
            try {
              input.close();
              output.close();
              client.close();
            }
            catch(IOException e) {
              e.printStackTrace();
            }
          }
     }

          public boolean handleEvent( Event e )
{
     if( e.id == Event.WINDOW_DESTROY ){
          hide();
          dispose();
          System.exit( 0 );
     }

     return super.handleEvent( e );
}

public static void main( String args[]){

     clientz c = new clientz();
     c.runClient();

}
}


//-------------------------------


import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;

public class serverz extends Frame{
     TextArea display;

     public serverz(){
          super("serverz");
          display = new TextArea(20 , 5);
          add("Center" , display);
          resize(300 , 150);
          show();
     }

     public void runserverz(){

     ServerSocket serve = null;
     Socket connection;
     OutputStream output = null;

     BufferedReader input = null;

     try{
          //sending message to client
          serve = new ServerSocket(5003 , 1000);
          connection = serve.accept();
          display.setText("\nConnection received");
          output = connection.getOutputStream();
          String s = new String("Has connected\n");

          for(int i = 0; i < s.length(); ++i)
               output.write((int) s.charAt(i));

          display.appendText(
               "\nSent message");

          //receiving message from client
          input = new BufferedReader(new InputStreamReader(connection.getInputStream()));
          String buffer = null;
          while((buffer = input.readLine()) != null) {
            display.appendText("\n" + buffer);
          }


     }

     catch(IOException e){
          e.printStackTrace();
     }
     // Always close
     finally {
       try {
         output.close();
         input.close();
         serve.close();
       }
       catch(IOException e) {
         e.printStackTrace();
       }
     }
}
     public boolean handleEvent( Event e )
{
     if( e.id == Event.WINDOW_DESTROY ){
          hide();
          dispose();
          System.exit( 0 );
     }

     return super.handleEvent( e );
}

public static void main(String args[]){
     serverz s = new serverz();
     s.runserverz();
}
}
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
eire_irelandAuthor Commented:
Thats greay, thanks a mil
0
CEHJCommented:
:-)
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Java

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.