如何使用Jsoup获取表单验证码图像？ [英] How to get a form captcha image with Jsoup?

问题描述

我正在为我的学校网站开发一个应用程序，我正在使用jsoup来解析html。

我遇到了验证码的问题我看到<一个href =https://stackoverflow.com/questions/28619161/getting-captcha-image-using-jsoup>这个问题，我已经实现了，但我没有得到与网站。

我如何获得相同的图像验证码，网站正在使用 BotDetectCaptcha 我有点困惑我怎么能专门做到这一点我的网站

解决方案

如SLaks评论中所述，您可能会遗漏一些Cookie。

以下是提供的网址的工作示例：

  //加载获取所需cookie的初始页面
 Connection conn = Jsoup.connect（https：// www.saes.upiicsa.ipn.mx/）; 
文件d = conn.get（）; 
 
元素captcha = d.select（＃c_default_ctl00_leftcolumn_loginuser_logincaptcha_CaptchaImage）。first（）; 
 if（captcha == null）{
抛出新的RuntimeException（无法找到验证码......）; 
} 
 
 //获取验证码图片
 Connection.Response response = Jsoup // 
 .connect（captcha.absUrl（src））//提取image绝对URL 
 .cookies（conn.response（）。cookies（））//抓取cookie 
 .ignoreContentType（true）//获取图像需要
 .execute（）; 
 
 //从Jsoup响应加载图像
 ImageIcon image = new ImageIcon（ImageIO.read（new ByteArrayInputStream（response.bodyAsBytes（））））; 
 
 //显示图片
 JOptionPane.showMessageDialog（null，image，Captcha image，JOptionPane.PLAIN_MESSAGE）; 
  

输出

在JSoup 1.8.3上测试

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

解决方案

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

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