Programming Forums > Application Development > Java

Eric the Red · May 16th, 2006, 9:42 PM

I'm working on sending information to a server with my tetris application.

I have the sever and a client and in order to test the program i ran it on the same computer.

Does anyone know why it won't connect? maybe a firewall problem? I put unblock to the server part of the program when "windows firewall" gave me a prompt.

I'm using windows xp if that helps.

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

class Client {
   public static void main(String args[]) {
      try {
         Socket skt = new Socket("localhost", 1234);
         BufferedReader in = new BufferedReader(new
            InputStreamReader(skt.getInputStream()));
         System.out.print("Received string: '");

         while (!in.ready()) {}
         System.out.println(in.readLine()); // Read one line and output it

         System.out.print("'\n");
         in.close();
      }
      catch(Exception e) {
         System.out.print("Whoops! It didn't work!\n");
      }
   }
}

(Toggle Plain Text)

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

class Server {
   public static void main(String args[]) {
      String data = "Toobie ornaught toobie";
      try {
         ServerSocket srvr = new ServerSocket(1234);
         Socket skt = srvr.accept();
         System.out.print("Server has connected!\n");
         PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
         System.out.print("Sending string: '" + data + "'\n");
         out.print(data);
         out.close();
         skt.close();
         srvr.close();
      }
      catch(Exception e) {
         System.out.print("Whoops! It didn't work!\n");
      }
   }
}

Booooze · May 16th, 2006, 9:59 PM

Without testing it all, I can't see too much wrong. Plus, I've never worked with sockets in java before. I'm guessing that your getting "whoops, it didn't work" error that you have there. In a help to everyone else, tell is what the exception is. Does it just say it can't connect/find server?

Eric the Red · May 17th, 2006, 12:34 AM

Quote:

Originally Posted by Booooze

Without testing it all, I can't see too much wrong. Plus, I've never worked with sockets in java before. I'm guessing that your getting "whoops, it didn't work" error that you have there. In a help to everyone else, tell is what the exception is. Does it just say it can't connect/find server?

nope my error is "whoops! it didn't work"

Booooze · May 17th, 2006, 1:25 AM

Quote:

Originally Posted by Eric the Red

nope my error is "whoops! it didn't work"

That's what you told it to do when it trys to catch an exception and succeeds. The error is stored in the variable e. Its there for a reason, not just for looks

try

(Toggle Plain Text)

System.out.print(e.toString());

Then see what you get.

Capitialization matters so you might have to change it.

jaeusm · May 17th, 2006, 1:41 AM

I ran your code on my machine and it works fine.

titaniumdecoy · May 17th, 2006, 2:23 AM

Quote:

Originally Posted by jaeusm

I ran your code on my machine and it works fine.

If that's the case then I'm guessing it's a problem with your internet setup (firewall perhaps?) as you suggested. I haven't worked with sockets so I can't help you there.

xavier · May 17th, 2006, 5:09 AM

And in the future, stop using try catch block without printing the error , then .... well it's pointless if can't see the error.
So always use as sugested by Booooze

(Toggle Plain Text)

System.out.print(e.toString());

java_roshan · May 17th, 2006, 7:47 AM

Quote:

(Toggle Plain Text)

System.out.print(e.toString());

or better, for a good description

(Toggle Plain Text)

System.out.print(e.getMessage());

xavier · May 17th, 2006, 9:08 AM

or

(Toggle Plain Text)

e.printStackTrace();

i think he gets the message :p

Eric the Red · May 17th, 2006, 6:11 PM

Quote:

Originally Posted by Booooze

That's what you told it to do when it trys to catch an exception and succeeds. The error is stored in the variable e. Its there for a reason, not just for looks

try

(Toggle Plain Text)

System.out.print(e.toString());

Then see what you get.

Capitialization matters so you might have to change it.

Okay.. I did what you told me too. The error is "java.net.ConnectException: Connection refused".

Now your probably thinking "turn off windows firewall" but that's done already. So any ideas?

May 16th, 2006, 9:42 PM	#1
Eric the Red Hobbyist Programmer Join Date: Feb 2006 Posts: 214 Rep Power: 0	networking with sockets I'm working on sending information to a server with my tetris application. I have the sever and a client and in order to test the program i ran it on the same computer. Does anyone know why it won't connect? maybe a firewall problem? I put unblock to the server part of the program when "windows firewall" gave me a prompt. I'm using windows xp if that helps. (Toggle Plain Text) import java.lang.; import java.io.; import java.net.; class Client { public static void main(String args[]) { try { Socket skt = new Socket("localhost", 1234); BufferedReader in = new BufferedReader(new InputStreamReader(skt.getInputStream())); System.out.print("Received string: '"); while (!in.ready()) {} System.out.println(in.readLine()); // Read one line and output it System.out.print("'\n"); in.close(); } catch(Exception e) { System.out.print("Whoops! It didn't work!\n"); } } } import java.lang.; import java.io.; import java.net.; class Client { public static void main(String args[]) { try { Socket skt = new Socket("localhost", 1234); BufferedReader in = new BufferedReader(new InputStreamReader(skt.getInputStream())); System.out.print("Received string: '"); while (!in.ready()) {} System.out.println(in.readLine()); // Read one line and output it System.out.print("'\n"); in.close(); } catch(Exception e) { System.out.print("Whoops! It didn't work!\n"); } } } (Toggle Plain Text) import java.lang.; import java.io.; import java.net.; class Server { public static void main(String args[]) { String data = "Toobie ornaught toobie"; try { ServerSocket srvr = new ServerSocket(1234); Socket skt = srvr.accept(); System.out.print("Server has connected!\n"); PrintWriter out = new PrintWriter(skt.getOutputStream(), true); System.out.print("Sending string: '" + data + "'\n"); out.print(data); out.close(); skt.close(); srvr.close(); } catch(Exception e) { System.out.print("Whoops! It didn't work!\n"); } } } import java.lang.; import java.io.; import java.net.; class Server { public static void main(String args[]) { String data = "Toobie ornaught toobie"; try { ServerSocket srvr = new ServerSocket(1234); Socket skt = srvr.accept(); System.out.print("Server has connected!\n"); PrintWriter out = new PrintWriter(skt.getOutputStream(), true); System.out.print("Sending string: '" + data + "'\n"); out.print(data); out.close(); skt.close(); srvr.close(); } catch(Exception e) { System.out.print("Whoops! It didn't work!\n"); } } } __________________ Death smiles at us all. All a man can do is smile back.

May 17th, 2006, 5:09 AM	#7
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 406 Rep Power: 5	And in the future, stop using try catch block without printing the error , then .... well it's pointless if can't see the error. So always use as sugested by Booooze (Toggle Plain Text) System.out.print(e.toString()); System.out.print(e.toString()); __________________ Don't take life too seriously, it's not permanent !

May 17th, 2006, 9:08 AM	#9
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 406 Rep Power: 5	or (Toggle Plain Text) e.printStackTrace(); e.printStackTrace(); i think he gets the message :p __________________ Don't take life too seriously, it's not permanent !

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May 16th, 2006, 9:59 PM	#2
Booooze Expert Programmer Join Date: Mar 2006 Location: Igloo Posts: 710 Rep Power: 3	Without testing it all, I can't see too much wrong. Plus, I've never worked with sockets in java before. I'm guessing that your getting "whoops, it didn't work" error that you have there. In a help to everyone else, tell is what the exception is. Does it just say it can't connect/find server?

May 17th, 2006, 1:41 AM	#5
jaeusm Programmer Join Date: Feb 2006 Location: Columbus, OH Posts: 84 Rep Power: 3	I ran your code on my machine and it works fine.

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Programming Forums > Application Development > Java

networking with sockets