分享一个Java开源项目—验证码kaptcha
1.下载Kaptcha项目官网：http://code.google.com/p/kaptcha/
我现在下载的是：kaptcha-2.3.2.zip
2.把kaptcha-2.3.2.jar添加的web project 里的lib目录下
3.把kaptcha配置到web.xml中
<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.font.color</param-name><param-value>black</param-value></init-param><init-param><param-name>kaptcha.textproducer.char.space</param-name><param-value>5</param-value></init-param></servlet><servlet-mapping><servlet-name>Kaptcha</servlet-name><url-pattern>/kaptcha.jpg</url-pattern></servlet-mapping>
4.编写jsp页面
<img src="kaptcha.jpg" width="200" id="kaptchaImage" /><form method="POST"><br>sec code:<input type="text" name="kaptcha"><br /><input type="submit" name="submit"></form><%String c = (String) session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);String parm = (String) request.getParameter("kaptcha");out.println("Parameter: " + parm + " ? Session Key: " + c + " : ");if (c != null && parm != null) {if (c.equals(parm)) {out.println("<b>true</b>");} else {out.println("<b>false</b>");}}%>
5.点击图片刷新验证码
<script type="text/javascript">$(function() {$('#kaptchaImage').click(function() {$(this).attr('src', 'kaptcha.jpg?' + Math.floor(Math.random() * 100));})});</script><br />Can't read the image? Click it to get a new one.
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