Python - Download Captcha Images

import requests
import os
from random import randint

for x in range(100, 1000):
    url = ""
    payload = {}
    headers= {}
    response = requests.request("GET", url, headers=headers, data = payload)
    #print(response.text.encode('utf8'))
   
    url = ""
    payload = {}
    response = requests.request("GET", url, cookies=response.cookies)
   
    f_ext = x
    f_name = 'D:/Temp/Captcha/{}.png'.format(f_ext)
    with open(f_name, 'wb') as f:
        f.write(response.content)
   
    print("Iteration : " + str(x) )

print( "Done !")

Simple Captcha

SimpleCaptcha
Installing

Installing SimpleCaptcha is no different than installing most other libraries for a J2EE container: a jar is deployed to WEB-INF/lib and web.xml is updated. These steps are described in detail below.

   1. Download SimpleCaptcha
   2. Copy the jar file to your WEB-INF/lib directory
   3. Add a mapping to web.xml. There are three servlets provided out of the box: StickyCaptchaServlet, SimpleCaptchaServlet, and ChineseCaptchaServlet. All generate CAPTCHA image/answer pairs, but StickyCaptchaServlet and ChineseCaptchaServlet are “sticky” to the user’s session: page reloads will render the same CAPTCHA instead of generating a new one. An example mapping for StickyCaptchaServlet:

    <servlet>
        <servlet-name>StickyCaptcha</servlet-name>
        <servlet-class>nl.captcha.servlet.StickyCaptchaServlet</servlet-class>
        <init-param>
            <param-name>width</param-name>
            <param-value>250</param-value>
        </init-param>
        <init-param>
            <param-name>height</param-name>
            <param-value>75</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>StickyCaptcha</servlet-name>
        <url-pattern>/stickyImg</url-pattern>
    </servlet-mapping>

The width and height parameters are optional; if unprovided the image will default to 200×50.

   4. Restart your webserver.
   5. Browse to the location given by the url-pattern defined in web.xml, e.g., http://localhost:8080/stickyImg. If everything has been set up correctly you should see a CAPTCHA image.
   6. Now create a JSP called captcha.jsp. Add the following code inside the <body> element:

          <img src="/stickyImg" />
          <form action="/captchaSubmit.jsp" method="post">
              <input name="answer" />
          </form>

   7. Create another JSP called captchaSubmit.jsp. Add the following:

          <%@ page import="nl.captcha.Captcha" %>
          ...
          <% // We're doing this in a JSP here, but in your own app you'll want to put
          // this logic in your MVC framework of choice.
          Captcha captcha = (Captcha) session.getAttribute(Captcha.NAME);
          request.setCharacterEncoding("UTF-8"); // Do this so we can capture non-Latin chars
          String answer = request.getParameter("answer");
          if (captcha.isCorrect(answer)) { %>
              <b>Correct!</b>
          <% } %>

   8. Browse to /captcha.jsp. You should get your CAPTCHA image, as well as a form for entering your answer. Submit the form and see what happens.