How to get a form captcha image with Jsoup?

I am developing an application for my school website and I'm using jsoup for parsing the html.

I'm facing a problem with captcha image I see this question and I had implemented but I am not getting the same image as is showed in the website.

How can I get the same image captcha, the website is using BotDetectCaptcha I am a little confused how can I do it specifically on my website

School Website

As stated in SLaks comment, you may be missing some cookies.

Here is a working example with the provided url:

// Load the initial page for getting the required cookies
Connection conn = Jsoup.connect("https://www.saes.upiicsa.ipn.mx/");
Document d = conn.get();

Element captcha = d.select("#c_default_ctl00_leftcolumn_loginuser_logincaptcha_CaptchaImage").first();
if (captcha == null) {
    throw new RuntimeException("Unable to find captcha...");
}

// Fetch the captcha image
Connection.Response response = Jsoup //
        .connect(captcha.absUrl("src")) // Extract image absolute URL
        .cookies(conn.response().cookies()) // Grab cookies
        .ignoreContentType(true) // Needed for fetching image
        .execute();

// Load image from Jsoup response
ImageIcon image = new ImageIcon(ImageIO.read(new ByteArrayInputStream(response.bodyAsBytes())));

// Show image
JOptionPane.showMessageDialog(null, image, "Captcha image", JOptionPane.PLAIN_MESSAGE);

OUTPUT

Tested on JSoup 1.8.3

You said that you don't get the same image that you see on the website... That's normal because everytime you refresh the page the image is different.

来源：https://stackoverflow.com/questions/34484492/how-to-get-a-form-captcha-image-with-jsoup

标签

java

android

jsoup

captcha