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 ...