Captcha uses offline resources

问题:

I want to create a CAPTCHA verification of my application, my application is developed using GWT, which not use online resources.

I've tried with reCaptcha, but recaptcha have to access the api hosted in the google.com. Is there any ways to make it working in my local network which totally can not access any resource of the internet? thanks

回答1:

You can use a local library like SimpleCaptcha.

Here an article that explain how to use it with GWT: http://www.javacodegeeks.com/2010/06/add-captcha-gwt-application.html