Add Captcha to Application

When i'm searching for a Captcha API written in java to embedded with my vaadin application, i have found out

SimpleCaptcha

SimpleCaptcha is a framework used in generating CAPTCHA image/answer pairs for Java (J2EE, Grails, JavaFX, etc.). It is intended to be simple to implement and provide sensible defaults, while having the ability to be customized in a wide variety of ways. Example implementations are provided in Java/J2EE and Grails.

Apply the simple captcha is a two step process.

        Captcha captcha = new Captcha.Builder(200, 50)
           .addText()
           .addBackground()
           .addNoise()
           .gimp()
           .addBorder()
           .build(); 
above line would create captch image and this captcha object has 
the image and the answer.
 
now you can apply this in anywhere you need in your application.
 
Link : http://simplecaptcha.sourceforge.net/ 
 
 
JCAPTCHA 

Stands for J ava C ompletely A utomated P ublic T est to tell C omputers
and H umans A part
Goals
  • Provide robust and reliable CAPTCHA implementation framework for JAVA
  • Provide accessible CAPTCHA implementations
  • Provide multi-type challenge (text, sound, image)
  • Easy integration with Spring and other new technologies.

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