Web验证码的实现方法(2)---开源组件Jcaptcha

来源：互联网发布：中国程序员垃圾编辑：程序博客网时间：2024/05/05 05:42

jcaptcha是一个开源的用来生成图形验证码的Java开源组件，使用起来也是非常的简单方便。

1.jsp部分

<body><h2>Simple Captcha Servlet sample</h2><form action="submit.action" method="post">     <img src="jcaptcha.jpg" /> <input type="text" name="japtcha" value="" />     <input type="submit"/></form></body>

2.Servlet部分

先导入jcaptcha-2.0-alpha-1-SNAPSHOT.jar

jcaptcha-api-1.0.jar

jcaptcha-integration-simple-servlet-2.0-alpha-1-SNAPSHOT.jar

这三个包

下载地址：上传的资源暂时未审核通过，通过后放上来，也可百度搜索下载，一样的。

package com.octo.captcha.module.servlet.image.sample;import com.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class SubmitActionServlet extends HttpServlet{protected void doPost(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException  {    String userCaptchaResponse = request.getParameter("japtcha");    boolean captchaPassed = SimpleImageCaptchaServlet.validateResponse(request, userCaptchaResponse);    if (captchaPassed)      response.getWriter().write("captcha passed");    else {      response.getWriter().write("captcha failed");    }    response.getWriter().write("<br/><a href='index.jsp'>Try again</a>");  }}

3. web.xml部分

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app>  <display-name>Simple Image Captcha Servlet Sample</display-name>    <servlet>            <servlet-name>jcaptcha</servlet-name>            <servlet-class>com.octo.captcha.module.servlet.image.SimpleImageCaptchaServlet</servlet-class>    </servlet>    <servlet>            <servlet-name>submit</servlet-name>            <servlet-class>com.octo.captcha.module.servlet.image.sample.SubmitActionServlet</servlet-class>    </servlet>    <servlet-mapping>            <servlet-name>jcaptcha</servlet-name>            <url-pattern>/jcaptcha.jpg</url-pattern>    </servlet-mapping>    <servlet-mapping>            <servlet-name>submit</servlet-name>            <url-pattern>/submit.action</url-pattern>    </servlet-mapping></web-app>

总结：

开源组件很好用，方便快捷，节省了开发时间，但是还是要把每一步都试一下，才能更详细的了解每一个功能怎么用。

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