Using Kaptcha to generate verification codes in Javaweb

Introducing the Kaptcha-2.3-jdk15.jar Package

configuring in Web. xml

<servlet>
<servlet-name>Kaptcha</servlet-name>
<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
<init-param>
<param-name>kaptcha.border</param-name>
<param-value>no</param-value>
</init-param>
<init-param>
<param-name>kaptcha.textproducer.char.space</param-name>
<param-value>5</param-value>
</init-param>
<init-param>
<param-name>kaptcha.textproducer.char.length</param-name>
<param-value>5</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Kaptcha</servlet-name>
<url-pattern>/captcha.jpg</url-pattern>
</servlet-mapping>

In the JSP page

To generate a random verification code.

<script type= "Text/javascript" >
function Changeverifycode (IMG) {
IMG.SRC = "Captcha.jpg?" +math.floor (Math.random () *100);
}

</script> Click to toggle

Using Kaptcha to generate verification codes in Javaweb