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java验证码组件kaptcha使用方法

使用方法项目中导入kaptcha-2.3.jar包在web.xml里面新增: 

代码如下:
<!– 登陆验证码Kaptcha –>    <servlet>        <servlet-name>Kaptcha</servlet-name>        <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>                   <init-param>            <param-name>kaptcha.producer.impl</param-name>            <param-value>com.google.code.kaptcha.impl.DefaultKaptcha </param-value>        </init-param>                   <init-param>                            <param-name>kaptcha.textproducer.font.color</param-name>                            <param-value>black</param-value>                   </init-param>                   <init-param>                            <param-name>kaptcha.textproducer.char.space</param-name>                            <param-value>10</param-value>                   </init-param>                   <init-param>                            <param-name>kaptcha.border</param-name>                            <param-value>no</param-value>                   </init-param>                   <init-param>                            <param-name>kaptcha.border.thickness</param-name>                            <param-value>0</param-value>                   </init-param>                   <init-param>                            <param-name>kaptcha.textproducer.font.size</param-name>                            <param-value>35</param-value>                   </init-param>                   <init-param>                            <param-name>kaptcha.textproducer.char.length</param-name>                            <param-value>4</param-value>                   </init-param>                   <init-param>            <param-name>kaptcha.image.width</param-name>            <param-value>150</param-value>        </init-param>        <init-param>            <param-name>kaptcha.image.height</param-name>            <param-value>50</param-value>        </init-param>        <init-param>                            <param-name>kaptcha.background.clear.from</param-name>                            <param-value>255,255,255</param-value>                   </init-param>                   <init-param>                            <param-name>kaptcha.background.clear.to</param-name>                            <param-value>255,255,255</param-value>                   </init-param>                   <init-param>            <param-name>kaptcha.textproducer.char.string</param-name>            <param-value>0123456789</param-value>        </init-param>        <init-param>            <param-name>kaptcha.textproducer.font.names</param-name>            <param-value>Arial Black</param-value>        </init-param>         <init-param>            <param-name>kaptcha.noise.impl</param-name>            <param-value>com.google.code.kaptcha.impl.NoNoise</param-value>        </init-param>    </servlet>    <servlet-mapping>        <servlet-name>Kaptcha</servlet-name>        <url-pattern>/kaptcha.jpg</url-pattern></servlet-mapping>

在页面上新增

代码如下:
<img id=”img” src=”kaptcha.jpg” width=”90″ height=”25″ onclick=”refresh();” alt=”点击更换验证码”/>function refresh() {                  document.getElementById(‘img’).src=”kaptcha.jpg?”+Math.random();}

在action里获取验证码ID:

代码如下:
request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

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