Question

I’m planning to make an application that can let the user accessing the Internet without opening the browser and type the login information to get the permission but just one click. I have no idea how to let the application open a web and fill the information without using a browser. Can anyone give me some suggestions?

Answer 1

Visit the login page of the website and examine the login form. Then use the DefaultHttpClient to send a Post request for the login.

This is roughly how I am using it:

public Boolean login() throws Exception {

    DefaultHttpClient httpClient = new DefaultHttpClient();

    // add login data (edit this to fit your website)
    List<NameValuePair> nvps = new ArrayList<NameValuePair>();
    nvps.add(new BasicNameValuePair("NAME_OF_USERNAME_FIELD", USERNAME));
    nvps.add(new BasicNameValuePair("NAME_OF_PASSWORD_FIELD", PASSWORD));

    // create the request
    HttpPost httpost = new HttpPost(LOGIN_URL);
    httpost.setEntity(new UrlEncodedFormEntity(nvps, DEFAULT_ENCODING));

    // execute the form
    HttpResponse response = httpClient.execute(httpost);
    BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity()
            .getContent(), DEFAULT_ENCODING));

    // fetch the result of the http request and save it as a string
    String line;
    StringBuilder sb = new StringBuilder();
    while ((line = reader.readLine()) != null) {
        sb.append(line).append("\n");
    }
    String input = sb.toString();

    // check if the login worked. This depends on the response of your website
    Pattern pattern = Pattern.compile(LOGIN_WORKED_PATTERN);
    Matcher m = pattern.matcher(input);

    if (m.find())
        return true;

    return false;
}

Adjust the code to fit your needs.