Logging in to a site programmatically

Hi
My requirement is to login a site with user name and password by using java program.Is this possible ??? if yes suggestions please...

thanks

That depends on how the login on this site is implemented. Is this a web site using some kind of HTTP authentication?

Hi
Yes the site which iam trying to login uses https authentication and uses post method in action.any tips how should i proceed???

thanks
[ July 17, 2007: Message edited by: mano ranjan ]

You still haven't provided much in the way of details. Apache provides a HTTP library that makes logging in and session management much easier.

In HTTP, Basic Authentication is a doddle, form based authentication is also pretty easy.

Anything else?

Not an advanced question. Moving...

This really has nothing to do with servlets either.

Moving to our sockets and internet protocols forum.
Sorry for all the bouncing.

Hi
i need to login a site using programmatically is it possible to do legally if yes how to do???

thanks

Originally posted by mano ranjan:
i need to login a site using programmatically is it possible to do legally if yes how to do?

Several things come to mind:

If this is a web app, then you can use the java.net.HttpUrlConnection class, or the Jakarta Commons HttpClient library to do this. More comfortable would be to use a package like jWebUnit, which works at the HTML level; login forms aren't different than other HTML forms.

Why are you concerned about the legality? Is this is a web site you're not supposed to access?

If this is a web site meant for people to use, then just doing the login programmatically isn't going to help much, is it? What do you hope to do with the content of whichever page gets sent after you login?

HI
Its is a site where i must login to it and read the data's from a particular
page.Yes iam using URLConnection for this purpose but after providing the username and password by post action . iam getting the inputstream of this url
after reading that url i still get the old login page data . but not the logged in page page.(i.e its not logged in i think).So how to login ???

thanks

Please post the code and the HTML login form you're trying to emulate.

HI

String urlString = "https://www.amazon.fr/gp/sign-in.html/";
    
    String username = "xxxxxx";
    String password = "xxxxxx";
    Authenticator.setDefault(new MyAuthenticator(username, password));
    URL url = new URL(urlString);
    
    URLConnection uc = url.openConnection();
    uc.setDoInput(true);
    uc.setDoOutput(true);
    uc.setAllowUserInteraction(true);
    
    uc.connect();
    InputStream content = (InputStream) url.getContent();
    BufferedReader in = new BufferedReader(new InputStreamReader(content));
    String line;
    while ((line = in.readLine()) != null) {
      System.out.println(line);
    }
    System.out.println("Done.");
  }
 
  static class MyAuthenticator extends Authenticator {
    private String username, password;
 
    public MyAuthenticator(String user, String pass) {
      username = user;
      password = pass;
    }
 
    protected PasswordAuthentication getPasswordAuthentication() {
    
      System.out.println("Requesting Host  : " + getRequestingHost());
      System.out.println("Requesting Port  : " + getRequestingPort());
      System.out.println("Requesting Prompt : " + getRequestingPrompt());
      System.out.println("Requesting Protocol: "
          + getRequestingProtocol());
      System.out.println("Requesting Scheme : " + getRequestingScheme());
      System.out.println("Requesting Site  : " + getRequestingSite());
      
      return new PasswordAuthentication(username, password.toCharArray());
      
    }
  }

This code retrieves the login page, yet there's nothing in it that would submit the login form back to the server (and then read what the server sends back after that).

If the web session involves more than just a page or two, it will be simpler to use a library like jWebUnit, rather than working with on the HTTP level like this.

HI
Is this jWebUnit is http testing tool ???

Originally posted by mano ranjan:
Is this jWebUnit is http testing tool ???

It is, but it can just as well be used outside of a testing context. It is very useful for accessing web sites programmatically.

Hi
thanks for your reply . but iam not able to download from here

thanks

The download works fine for me.