CAPTCHA是Completely Automated Public Turing Test to Tell Computers and Humans Apart
全自动区分计算机和人类的图灵测试的简称
1.引入jar包
jcaptcha-1.0.jar
2.配置mvc整合文件 ***.xml
<!-- 指定Spring Bean的配置文件所在目录。默认配置在WEB-INF目录下 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext*.xml,classpath:***.xml</param-value> </context-param> <filter> <filter-name>encoding</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> </filter>
2.1 ***.xml 内容
<?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-3.2.xsd" default-lazy-init="true"> <!--kaptcha验证码 <bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha"> <property name="config"> <bean class="com.google.code.kaptcha.util.Config"> <constructor-arg type="java.util.Properties"> <value>kaptcha.border=yes</value> </constructor-arg> </bean> </property> </bean> --> <bean id="captchaService" class="com.octo.captcha.service.multitype.GenericManageableCaptchaService"> <constructor-arg index="0" ref="imageEngine"/> <constructor-arg type="int" index="1" value="180"/> <constructor-arg type="int" index="2" value="100000"/> <constructor-arg type="int" index="3" value="75000"/> </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 bean="wordgen"/> </constructor-arg> <constructor-arg> <ref bean="wordtoimage"/> </constructor-arg> </bean> <bean id="wordgen" class= "com.octo.captcha.component.word.wordgenerator.RandomWordGenerator"> <!--可选字符--> <constructor-arg> <value>aabbccddeefgghhkkmnnooppqqsstuuvvwxxyyzz</value> </constructor-arg> </bean> <bean id="wordtoimage" class="com.octo.captcha.component.image.wordtoimage.ComposedWordToImage"> <constructor-arg index="0"> <ref bean="fontGenRandom"/> </constructor-arg> <constructor-arg index="1"> <ref bean="backGenUni"/> </constructor-arg> <constructor-arg index="2"> <ref bean="decoratedPaster"/> </constructor-arg> </bean> <bean id="fontGenRandom" class="com.octo.captcha.component.image.fontgenerator.RandomFontGenerator"> <!--最小字体--> <constructor-arg index="0"> <value>14</value> </constructor-arg> <!--最大字体--> <constructor-arg index="1"> <value>20</value> </constructor-arg> <constructor-arg index="2"> <list> <bean class="java.awt.Font"> <constructor-arg index="0"><value>Arial</value></constructor-arg> <constructor-arg index="1"><value>0</value></constructor-arg> <constructor-arg index="2"><value>32</value></constructor-arg> </bean> </list> </constructor-arg> </bean> <bean id="backGenUni" class="com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator"> <!--背景宽度--> <constructor-arg index="0"> <value>80</value> </constructor-arg> <!--背景高度--> <constructor-arg index="1"> <value>28</value> </constructor-arg> </bean> <bean id="decoratedPaster" class="com.octo.captcha.component.image.textpaster.DecoratedRandomTextPaster"> <!--最大字符长度--> <constructor-arg type="java.lang.Integer" index="0"> <value>4</value> </constructor-arg> <!--最小字符长度--> <constructor-arg type="java.lang.Integer" index="1"> <value>4</value> </constructor-arg> <!--文本颜色--> <constructor-arg index="2"> <ref bean="colorGen"/> </constructor-arg> <!--文本混淆--> <constructor-arg index="3"> <list> <!--<ref bean="baffleDecorator"/>--> </list> </constructor-arg> </bean> <bean id="baffleDecorator" class="com.octo.captcha.component.image.textpaster.textdecorator.BaffleTextDecorator"> <constructor-arg type="java.lang.Integer" index="0"><value>1</value></constructor-arg> <constructor-arg type="java.awt.Color" index="1"><ref bean="colorWrite"/></constructor-arg> </bean> <bean id="colorGen" class="com.octo.captcha.component.image.color.SingleColorGenerator"> <constructor-arg type="java.awt.Color" index="0"> <ref bean="colorBlack"/> </constructor-arg> </bean> <bean id="colorWrite" class="java.awt.Color"> <constructor-arg type="int" index="0"> <value>255</value> </constructor-arg> <constructor-arg type="int" index="1"> <value>255</value> </constructor-arg> <constructor-arg type="int" index="2"> <value>255</value> </constructor-arg> </bean> <bean id="colorBlack" class="java.awt.Color"> <constructor-arg type="int" index="0"> <value>50</value> </constructor-arg> <constructor-arg type="int" index="1"> <value>50</value> </constructor-arg> <constructor-arg type="int" index="2"> <value>50</value> </constructor-arg> </bean> </beans>
3.web.xml整合***.xml
<servlet> <servlet-name>Jcaptcha</servlet-name> <servlet-class>com.rbao.east.servlet.JcaptchaServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Jcaptcha</servlet-name> <url-pattern>/captcha.svl</url-pattern> </servlet-mapping>
4.建立提供验证码的servlet
import java.awt.image.BufferedImage; import java.io.IOException; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.io.output.ByteArrayOutputStream; import org.springframework.beans.factory.BeanFactoryUtils; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import com.octo.captcha.service.CaptchaServiceException; import com.octo.captcha.service.image.ImageCaptchaService; /** * 提供验证码图片的Servlet */ @SuppressWarnings("serial") public class JcaptchaServlet extends HttpServlet { public static final String CAPTCHA_IMAGE_FORMAT = "jpeg"; private ImageCaptchaService captchaService; @Override public void init() throws ServletException { WebApplicationContext appCtx = WebApplicationContextUtils .getWebApplicationContext(getServletContext()); captchaService = (ImageCaptchaService) BeanFactoryUtils .beanOfTypeIncludingAncestors(appCtx, ImageCaptchaService.class); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { byte[] captchaChallengeAsJpeg = null; // the output stream to render the captcha image as jpeg into ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream(); try { // get the session id that will identify the generated captcha. // the same id must be used to validate the response, the session id // is a good candidate! String captchaId = request.getSession().getId(); BufferedImage challenge = captchaService.getImageChallengeForID( captchaId, request.getLocale()); // Jimi.putImage("image/jpeg", challenge, jpegOutputStream); ImageIO.write(challenge, CAPTCHA_IMAGE_FORMAT, jpegOutputStream); } catch (IllegalArgumentException e) { response.sendError(HttpServletResponse.SC_NOT_FOUND); return; } catch (CaptchaServiceException e) { response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); return; } // catch (JimiException e) { // response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); // return; // } captchaChallengeAsJpeg = jpegOutputStream.toByteArray(); // flush it in the response response.setHeader("Cache-Control", "no-store"); response.setHeader("Pragma", "no-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/" + CAPTCHA_IMAGE_FORMAT); ServletOutputStream responseOutputStream = response.getOutputStream(); responseOutputStream.write(captchaChallengeAsJpeg); responseOutputStream.flush(); responseOutputStream.close(); } }
刚开始写,也不知道怎么样,就先这样吧。记录一下自己在工作中遇到的一些技术或问题。