!!! Listings aus dem Artikel "Turing fuer alle"
!!! von Stefan Mintert in iX 8/2010, S. 136


!!! Listing 1: Einbinden des reCaptcha-Dienstes

<script 
   type="text/javascript"
   src="http://api.recaptcha.net/challenge?k=<your_public_key>">
</script>

!!! Listing 2: Ohne JavaScript

<noscript>
   <iframe src="http://api.recaptcha.net/noscript?k=<your_public_key>"
       height="300" width="500" frameborder="0"></iframe><br>
   <textarea name="recaptcha_challenge_field" rows="3" cols="40">
   </textarea>
   <input type="hidden" name="recaptcha_response_field" 
       value="manual_challenge">
</noscript>

!!! Listing 3: Java-Code

ReCaptchaResponse response = captcha.checkAnswer(
	request.getRemoteAddr(), 
	request.getParameter("recaptcha_challenge_field"), 
	request.getParameter("recaptcha_response_field"));
boolean validity = response.isValid();

!!! Listing 4: Stilzuweisungen

.recaptchatable .recaptcha_image_cell, #recaptcha_table {
   background-color:#fff !important; //reCaptcha widget background color
 }
 
#recaptcha_table {
   border-color: #4D4C4D !important; //reCaptcha widget border color
}
 
#recaptcha_response_field {
   border-color: #FFA015 !important; //Text input field border color
   background-color:#ffffff !important; //Text input field background color
}