• 图形验证码笔记


    1,maven配置

    <dependency>
    <groupId>com.google.code</groupId>
    <artifactId>kaptcha</artifactId>
    <version>2.3.2</version>
    </dependency>

    2,web.xml配置servlet拦截

    <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.border.color</param-name>
    <param-value>red</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.border.thickness</param-name>
    <param-value>5</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.image.width</param-name>
    <param-value>85</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.image.height</param-name>
    <param-value>30</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.producer.impl</param-name>
    <param-value>com.google.code.kaptcha.impl.DefaultKaptcha </param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.textproducer.impl</param-name>
    <param-value>com.google.code.kaptcha.text.impl.DefaultTextCreator</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.textproducer.char.string</param-name>
    <param-value>1234567890</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.textproducer.font.names</param-name>
    <param-value>Consolas,Arial, Courier</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.textproducer.font.size</param-name>
    <param-value>25</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.noise.impl</param-name>
    <param-value>com.google.code.kaptcha.impl.NoNoise </param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.noise.color</param-name>
    <param-value>black</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.obscurificator.impl</param-name>
    <param-value>com.google.code.kaptcha.impl.ShadowGimpy</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.background.impl</param-name>
    <param-value>com.google.code.kaptcha.impl.DefaultBackground</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.background.clear.from</param-name>
    <param-value>211,236,230</param-value>
    </init-param>
    <init-param>
    <param-name>kaptcha.background.clear.to</param-name>
    <param-value>211,237,228</param-value>
    </init-param>
    </servlet>
    <servlet-mapping>
    <servlet-name>kaptcha</servlet-name>
    <url-pattern>/kaptcha.jpg</url-pattern>
    </servlet-mapping>

    3,页面html

    <img id="img" width="140" height="45" src="kaptcha.jpg" alt="">
    <span ><a  href="javascript:void(0);">看不清,换一张</a></span>

    $("#img").hide().attr('src', 'kaptcha.jpg?' + Math.floor(Math.random() * 100)).fadeIn();//刷新

    4,从HttpServletRequest 中获取验证码

    HttpSession session = request.getSession();

    String captcha = (String) session

    .getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

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  • 原文地址:https://www.cnblogs.com/zhuzhiq/p/5698390.html
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