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Thread: Socket problem

  1. #1
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    Default Socket problem

    Hi I wanted to create a client side socket which connects to the host and sends data.
    But the problem is the client connects to it, but doesn't send data.Here's the code:
    import java.net.*;
    import java.io.*;
    import java.rmi.UnknownHostException;
       class Client{
    	   public static void main(String args[]){
    		   Socket sock;
    		   BufferedReader br;
    		   PrintWriter pr;
    		   String str;
    		   try {
     
    	            sock = new Socket("localhost", 80);
    	            System.out.println("Connected to server");
     
     
    	            br = new BufferedReader(new InputStreamReader(
    	            		                sock.getInputStream()));
     
    	            while ((str = br.readLine())!= null) {
    	                System.out.println(str);
     
     
    		   }
    	            System.out.println("Reading complete!");
    	            pr = new PrintWriter(new OutputStreamWriter(
                            sock.getOutputStream()));
     
    			pr.println("Hello.");
    			System.out.println("Message sent");
     
    	            pr.close();
    	            br.close();
    	            sock.close();
    		   }catch (UnknownHostException e) {
    			   System.out.println("Error");
    		   }
     
     
    		   catch(IOException e){
    			   System.out.println("Error");
     
    		   }
    		 }
           }
    Last edited by Robtn; June 3rd, 2011 at 11:56 PM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Socket problem

    What does your code do?
    Does it print out anything?
    Does it block/hang waiting for a response from the server?

    Does the server get anything?

    What kind of server are you using?

  3. #3
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    Default Re: Socket problem

    Quote Originally Posted by Norm View Post
    What does your code do?
    Does it print out anything?
    Does it block/hang waiting for a response from the server?

    Does the server get anything?

    What kind of server are you using?
    It prints out texts and player's stats.
    Yes it does.
    Yes it takes.
    The server is multi player game server.port 80

  4. #4
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    Default Re: Socket problem

    Great, sounds like its working. You have not given enough info for anyone to help you with your problem.

    Can you explain what the problem is and show println output from your code that shows what it does?

    doesn't send data
    how do you know? What debugging steps have you taken to show what is happening on the client side and on the server side? Show the println output and the code that generated it.

  5. #5
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    Default Re: Socket problem

    Quote Originally Posted by Norm View Post
    Great, sounds like its working. You have not given enough info for anyone to help you with your problem.

    Can you explain what the problem is and show println output from your code that shows what it does?


    how do you know? What debugging steps have you taken to show what is happening on the client side and on the server side? Show the println output and the code that generated it.
    sorry i can't speak English well,but i just wanted to send data to the server it's just not working.
    One expert told me that i am putting everything in one function.Can anyone please help please.

  6. #6
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    Default Re: Socket problem

    Before you can communicate with a server, you need to know how the server works.
    What protocol does the server understand? for example: HTTP and FTP are two common protocols.
    Your code connects and then tries to read something.
    What does it read? Is anything printed out?
    Why do you think the server will send you data after you connect to it?
    your program tries to read something from the server. Does the server write anything when it connects?

  7. #7
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    Default Re: Socket problem

    Quote Originally Posted by Norm View Post
    Before you can communicate with a server, you need to know how the server works.
    What protocol does the server understand? for example: HTTP and FTP are two common protocols.
    Your code connects and then tries to read something.
    What does it read? Is anything printed out?
    Why do you think the server will send you data after you connect to it?
    your program tries to read something from the server. Does the server write anything when it connects?
    Very very sorry for the late message.I've been working on other project.
    It reads players stats and chat messages and commands.It also reads in gameplay data.Also it is HTTP server.
    Last edited by Robtn; June 15th, 2011 at 11:50 AM.

  8. #8
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    Default Re: Socket problem

    What is the projects status now?

  9. #9
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    Default Re: Socket problem

    What do you mean?I can't speak english much

  10. #10
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    Default Re: Socket problem

    Do you have a problem now?

  11. #11
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    Default Re: Socket problem

    Quote Originally Posted by Norm View Post
    Do you have a problem now?
    Yes still,it just connects to the server but does nothing.

  12. #12
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    Default Re: Socket problem

    Why do you think the server will send you data after you connect to it?
    Your program tries to read something from the server.
    Does the server write anything when your program connects to it?

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