zoukankan      html  css  js  c++  java
  • 推荐一款java的验证码组件——kaptcha

    使用方法:

    • 项目中导入kaptcha-2.3.jar包
    • 在web.xml里面新增:   
      <!-- 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
      <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:
      request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
  • 相关阅读:
    毕业四年,你赚回四年的花费了吗?
    【转】解决VS2008 开发Windows Mobile 项目生成速度慢的问题
    WinCE/Mobile上下滑动浏览DataGrid数据 【转】
    【转】取得汉字拼音的首字母
    漂亮的 Windows Mobile 按钮
    SQLite中的常用操作(总结)
    浅谈HTTP中Get与Post的区别
    Oracle学习之数组
    firefox与ie 的javascript区别
    常用bash shell 脚本
  • 原文地址:https://www.cnblogs.com/xujanus/p/3429157.html
Copyright © 2011-2022 走看看