kaptcha - A kaptcha generation engine clone of http://code.google.com/p/kaptcha/.
- Make it Maven based
- Allow use it from Spring
-
JCaptcha (http://jcaptcha.sourceforge.net/)
- Bad community responds (bad API).
-
SimpleCaptcha (http://simplecaptcha.sourceforge.net/)
- Not maven based
- Binary based (imaging.jar represents jhlabs of 2000, Internet gives me only latest com.jhlabs.filters:2.0.235 version)
-
ReCaptcha (http://www.google.com/recaptcha)
- Hard to read
and decided to make my own fork...
<dependencies>
<dependency>
<groupId>com.github.axet</groupId>
<artifactId>kaptcha</artifactId>
<version>0.0.8</version>
</dependency>
</dependencies>
package com.example.controller;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.google.code.kaptcha.servlet.KaptchaExtend;
@Controller
public class RegisterKaptchaController extends KaptchaExtend {
@RequestMapping(value = "/captcha.jpg", method = RequestMethod.GET)
public void captcha(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.captcha(req, resp);
}
@RequestMapping(value = "/register", method = RequestMethod.GET)
public ModelAndView registerGet(@RequestParam(value = "error", required = false) boolean failed,
HttpServletRequest request) {
ModelAndView model = new ModelAndView("register-get");
//
// model MUST contain HTML with <img src="/captcha.jpg" /> tag
//
return model;
}
@RequestMapping(value = "/register", method = RequestMethod.POST)
public ModelAndView registerPost(@RequestParam(value = "email", required = true) String email,
@RequestParam(value = "password", required = true) String password, HttpServletRequest request) {
ModelAndView model = new ModelAndView("register-post");
if (email.isEmpty())
throw new RuntimeException("email empty");
if (password.isEmpty())
throw new RuntimeException("empty password");
String captcha = request.getParameter("captcha");
if (!captcha.equals(getGeneratedKey(request)))
throw new RuntimeException("bad captcha");
//
// eveyting is ok. proceed with your user registration / login process.
//
return model;
}
}