Logging in to website programmatically Android

Question

I am creating an app which needs to login to a website programmatically. I tried to use this code, but it doesn't log me in.

@Override
    protected Boolean doInBackground(Void... arg0) {
        try {
            Connection.Response res = Jsoup.connect("http://omegastrike.co.uk/member.php?action=login")
                    .data("username", username, "password", password)
                    .followRedirects(true)
                    .method(Method.POST)
                    .execute();
            
            Map<String, String> cookies = res.cookies();

            Document doc2 = Jsoup.connect("http://omegastrike.co.uk/index.php")
                    .cookies(cookies)
                    .get();
            

            System.out.println(doc2);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

Bonus question: How do I use this logged in connection for other functionalities in the app? Do I need to keep logging in?

What do you mean by "doesn't log me in"? What output are you looking for as a sign of success? — David S., Jan 03 '14 at 18:22
The second connect html page result should contain certain text. Containing my username. But it still says: "Welcome, guest" — Black Magic, Jan 03 '14 at 18:25

David S. · Accepted Answer · 2014-01-03T18:54:33.757

So when you look at the login form for this page, the raw HTML looks like this:

    <form method="post" action="member.php">
        <table border="0" width="100%">
            <tr>
                <td>
                    <label for="login_username">Username:</label>
                </td>
                <td>
                    <input type="text" value="" style="width: 95%;" maxlength="30" size="25" name="username" class="textbox" id="login_username" />
                </td>
            </tr>
            <tr>
                <td>
                    <label for="login_password">Password:</label>
                </td>
                <td>
                    <input type="password" value="" style="width: 95%;" size="25" name="password" class="textbox" id="login_password" />
                </td>
            </tr>
            <tr>
                <td>
                    <label class="smalltext" title="If ticked, your login details will be remembered on this computer, otherwise, you will be logged out as soon as you close your browser."><input type="checkbox" value="yes" checked="checked" name="remember" class="checkbox"> Remember Me</label>
                </td>
                <td style="text-align: right;">
                    <input type="submit" value="Login" name="submit" id="button_postbit" />
                </td>
            </tr>
        </table>
        <input type="hidden" value="do_login" name="action" />
        <input type="hidden" value="" name="url" />
    </form>

As you can see, this is a POST, to the URL http://omegastrike.co.uk/member.php. There are several fields being submitted, not just username and password. The fields are:

    [username] => namehere 
    [password] => passhere 
    [remember] => yes 
    [submit] => Login 
    [action] => do_login

So you need to include all of those in your POST request.

It would look something like this:

    Connection.Response res = Jsoup.connect("http://omegastrike.co.uk/member.php")
                .data("username", username, "password", password, "submit", "Login", "action", "do_login")
                .followRedirects(true)
                .method(Method.POST)
                .execute();

As to staying logged in, I don't have an account with which to test, but generally there is a session id header or a cookie set upon login, that if included with subsequent requests, will keep you logged in.

Great it is working now! :) How do I find out how they remember it? Propably using the network tab in the inspect element function? — Black Magic, Jan 03 '14 at 18:43
Look at the headers and cookies sent back in the response to the login. Try sending those in a subsequent request one at a time until you see which one controls your session. — David S., Jan 03 '14 at 18:46
If you use Apache Components you don't need to bother about sending Cookies, in my experience, they will be sent automatically by the HttpClient object. — Kovács Imre, Jan 03 '14 at 18:51
I have written essentially the same code (http://stackoverflow.com/questions/31640844/login-to-website-through-jsoup-not-working) yet it is not working.. Would you please take a quick look? — mlz7, Jul 26 '15 at 19:45

score 1 · Answer 2 · answered Jan 03 '14 at 18:47

1

use

...

    Jsoup.connect("http://omegastrike.co.uk/member.php")
                        .data("username", username, "password", password, "submit", "Login", "action", "do_login")  

...

answered Jan 03 '14 at 18:47

Mario

175
1
7

score 0 · Answer 3 · answered Jan 03 '14 at 18:49

0

You can use Apache HTTP Components. HttpPost will do the job for you. Make sure you spoof the User-Agent, because some servers are set to accept only certain browsers. Also using Wireshark as a sniffer is highly recommended.

answered Jan 03 '14 at 18:49

Kovács Imre

715
2
7
17

Logging in to website programmatically Android

3 Answers3

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