关于验证码的独立模块的整合说明

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鹿鼎公

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Servlet Spring Web XML maven

关于验证码的独立模块的整合说明

         验证码我们采用开源的jcaptcha（http://www.jcaptcha.net/）来实现，主要考虑到两点

1.       已经有相当成熟的成功案例。

2.       配置非常简单，整合Spring框架非常容易。

现在将配置文件和应用开发简单的说明一下

需要的包中包括

jcaptcha-all-1.0-RC6.jar

spring-2.x.x.jar

maven 配置文件只需要添加

<dependency>

     <groupId>com.octo.captcha</groupId>

     <artifactId>jcaptcha</artifactId>

     <version>1.0-RC6</version>

</dependency>

配置文件

applicationContext-jcaptcha.xml

web.xml

ImageCaptchaServlet.java (本来只做参考也可以使用)

web.xml文件内容

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">

    <context-param>

           <param-name>contextConfigLocation</param-name>

           <param-value>

            /WEB-INF/applicationContext*.xml

        </param-value>

    </context-param>

    <filter>

           <filter-name>encodingFilter</filter-name>      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

           <init-param>

                  <param-name>encoding</param-name>

                  <param-value>UTF-8</param-value>

           </init-param>

           <init-param>

                  <param-name>forceEncoding</param-name>

                  <param-value>true</param-value>

           </init-param>

    </filter>

       <servlet>

       <servlet-name>validateImage</servlet-name>

        <servlet-class>com.zongheng.servlet.ImageJCaptchaServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>validateImage</servlet-name>

        <url-pattern>/validateImage</url-pattern>

    </servlet-mapping>

<listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

</web-app>

类ImageJCaptchaServlet.java

package com.zongheng.servlet;

import com.octo.captcha.service.image.ImageCaptchaService;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.context.ApplicationContext;

import org.springframework.web.context.support.WebApplicationContextUtils;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.OutputStream;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ImageJCaptchaServlet extends HttpServlet {

    private static final long serialVersionUID = -5382766069139170499L;

    protected final Logger logger = LoggerFactory.getLogger(getClass());

    protected ImageCaptchaService captchaService;

public void init() throws ServletException {

        super.init();

        ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(getServletContext());

        captchaService = (ImageCaptchaService) context.getBean("captchaService");

}

protected void service(HttpServletRequest request,

        HttpServletResponse response) throws ServletException, IOException {

        String jsessionid = request.getSession(true).getId();

        BufferedImage image = captchaService.getImageChallengeForID(jsessionid,request.getLocale());

        OutputStream outputStream = null;

        try {

            outputStream = response.getOutputStream();

            // render the captcha challenge as a JPEG image in the response

            response.setHeader("Cache-Control", "no-store");

            response.setHeader("Pragma", "no-cache");

            response.setDateHeader("Expires", 0);

            response.setContentType("image/jpeg");

            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outputStream);

            encoder.encode(image);

            outputStream.flush();

            outputStream.close();

        } catch (IOException ex) {

            logger.error("gen image error", ex);

            response.sendError(HttpServletResponse.SC_NOT_FOUND);

        } finally {

            if (outputStream != null) {

                outputStream.close();

            }

        }

应用程序校验验证码是否正确非常简单

String jsessionid = request.getSession(true).getId(); //得到当前用户的SessionID

String code =request.getParameter(“code”)； //获取用户输入的验证码

ApplicationContext context = … 通过注入的方式或通过Servlet方法得到

ImageCaptchaService captchaService = (ImageCaptchaService) context.getBean("captchaService");

Boolean flag = captchaService.validateResponseForID(sessionid,code);

If(flag){

       //验证通过

}else{

       //验证未通过

}

applicationContext-jcaptch.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

       <bean id="captchaService" class="com.octo.captcha.service.image.DefaultManageableImageCaptchaService">

              <property name="captchaEngine" ref="imageEngine"/>

       </bean>

       <bean id="imageEngine" class="com.octo.captcha.engine.GenericCaptchaEngine">

              <constructor-arg index="0">

                     <list>

                            <ref bean="captchaFactory"/>

                     </list>

              </constructor-arg>

       </bean>

       <bean id="captchaFactory" class="com.octo.captcha.image.gimpy.GimpyFactory">

              <constructor-arg ref="wordgen"/>

              <constructor-arg ref="wordtoimage"/>

       </bean>

       <bean id="wordgen" class="com.octo.captcha.component.word.wordgenerator.RandomWordGenerator">

              <constructor-arg value="23456789ABCDEFGHJKLMNPQRSTXYZ"/>

              <!—建议不要使用1 因为如果通过技术手段展现图片中很难分辨1 和 I -->

       </bean>

       <bean id="wordtoimage" class="com.octo.captcha.component.image.wordtoimage.ComposedWordToImage">

              <constructor-arg index="0" ref="fontGenRandom"/>

<constructor-arg index="1" ref="backGenUni"/>

              <constructor-arg index="2" ref="simpleWhitePaster"/>

       </bean>

       <bean id="fontGenRandom" class="com.octo.captcha.component.image.fontgenerator.RandomFontGenerator">

              <constructor-arg index="0" value="30"/>

              <!—字体宽度根据实际情况做调整-->

              <constructor-arg index="1" value="40"/>

              <!—字体高度根据实际情况做调整-->

              <constructor-arg index="2">

                     <list>

                            <ref bean="fontArial"/>

                            <ref bean="fontTahoma"/>

                            <ref bean="fontVerdana"/>

                            <ref bean="fontComic"/>

                            <ref bean="fontLucida"/>

                     </list>

              </constructor-arg>

       </bean>

       

       <bean id="fontArial" class="java.awt.Font">

              <constructor-arg index="0" value="Arial"/>

              <constructor-arg index="1" value="0"/>

              <constructor-arg index="2" value="10"/>

       </bean>

       <bean id="fontTahoma" class="java.awt.Font">

              <constructor-arg index="0" value="Tahoma"/>

              <constructor-arg index="1" value="0"/>

              <constructor-arg index="2" value="10"/>

       </bean>

       <bean id="fontVerdana" class="java.awt.Font">

              <constructor-arg index="0" value="Verdana"/>

              <constructor-arg index="1" value="0"/>

              <constructor-arg index="2" value="10"/>

       </bean>

       <bean id="fontComic" class="java.awt.Font">

              <constructor-arg index="0" value="Comic sans MS"/>

              <constructor-arg index="1" value="0"/>

              <constructor-arg index="2" value="10"/>

       </bean>

       <bean id="fontLucida" class="java.awt.Font">

              <constructor-arg index="0" value="Lucida console"/>

              <constructor-arg index="1" value="0"/>

              <constructor-arg index="2" value="10"/>

</bean>

       

       <bean id="backGenUni" class="com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator">

              <constructor-arg index="0" value="200"/>

              <!—图片宽度单位为pixel根据实际情况做调整-->

              <constructor-arg index="1" value="100"/>

           <!—图片高度单位为pixel根据实际情况做调整-->

       </bean>

       <bean id="simpleWhitePaster" class="com.octo.captcha.component.image.textpaster.SimpleTextPaster">

              <constructor-arg type="java.lang.Integer" index="0" value="3"/>

              <!—最小的字符长度根据实际情况做调整-->

              <constructor-arg type="java.lang.Integer" index="1" value="5"/>

        <!—最大的字符长度根据实际情况做调整-->

              <constructor-arg type="java.awt.Color" index="2" ref="colorGreen"/>

       </bean>

       <bean id="colorGreen" class="java.awt.Color">

        <!—字体颜色根据实际情况做调整-->

              <constructor-arg index="0" value="10"/>

              <constructor-arg index="1" value="100"/>

              <constructor-arg index="2" value="200"/>

       </bean>

</beans>

JSP页面程序

<script language="javascript" type="text/javascript">

function changeImage() {

         document.getElementById('japtchaImage').src = '/validateImage?' + Math.random();

}

</script>

<img src="/ validateImage " width="200" id="japtchaImage" name="code" _disibledevent="changeImage();">

<a href="#" _disibledevent="changeImage();return false;" title="看不清,换一张" >看不清,换一张</a>

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