POSTing to a website through HTML form

Question

Hello,
I've been trying to write a program that accesses a website that requires you to login first.
Here's the core of my code:
     try{
               BufferedReader in = new BufferedReader(new InputStreamReader(site.openStream()));
               OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());
               out.write("user=user&pass=pass");          
               String inputLine;          
               while ((inputLine = in.readLine()) != null){
                    System.out.println(inputLine);
               out.close();
          catch(IOException e){
               System.out.println("Could not read from site: " + e.getMessage());
          }Everything works as assumed, no error messages what so ever, but the output read from System.out.println still gives me the invalid login message.
This is my first time venturing into the POST subject through JAVA, so I'm not sure how to check where to error lies. Any ideas?
The user and pass are valid. The website gives the invalid login message when no fields are entered as well.

Answer 1

I think the problem is with
out.write("user=user&pass=pass");The variables user, pass depends on what the website's login script requires i.e. your website's login script could be expect parameters username, password.
Check this article for more information on doing something like this ( [log in to a website using HTTP POST|http://www.1your.com/drupal/LoginToWebsiteByHTTPPOST] ). This article also points to a sample login script you can run this code against.
Hope this helps,
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