kaptcha验证码的使用

web.xml:配置kaptcha的servlet及部分样式模板


Kaptcha
com.google.code.kaptcha.servlet.KaptchaServlet





kaptcha.border



no





kaptcha.textproducer.font.color


red





kaptcha.image.width


135





kaptcha.textProducer.char.string


ACDEFHKPRSTWX345679





kaptcha.image.height


50





kaptcha.textproducer.font.size


43





kaptcha.noise.color


black





kaptcha.textproducer.char.length


4





kaptcha.textproducer.font.names


Aria



Kaptcha
/Kaptcha



后端校验

/**
* 校验验证码
*/
public class CodeUtil {
public static boolean checkVerifyCode(HttpServletRequest request) {
String verifyCodeExpected = (String) request.getSession()
.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
String verifyCodeActual = HttpServletRequestUtil.getString(request, "verifyCodeActual");
if (verifyCodeActual == null || !verifyCodeActual.equals(verifyCodeExpected)) {
return false;
}
return true;
}
}


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