验证码生成无敌版

1.创建一个servlet

package cn.itcast.common;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.io.IOException;import javax.annotation.Resource;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.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;import cn.itcast.common.web.SessionProvider;/** * 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;private SessionProvider session;@Overridepublic void init() throws ServletException {WebApplicationContext appCtx = WebApplicationContextUtils.getWebApplicationContext(getServletContext());captchaService = (ImageCaptchaService) BeanFactoryUtils.beanOfTypeIncludingAncestors(appCtx, ImageCaptchaService.class);session = (SessionProvider) BeanFactoryUtils.beanOfTypeIncludingAncestors(appCtx, SessionProvider.class);}@Overrideprotected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {byte[] captchaChallengeAsJpeg = null;// the output stream to render the captcha image as jpeg intoByteArrayOutputStream 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 = session.getSessionId(request);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 responseresponse.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();}}

2.创建一个一个xml文件

<?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-3.0.xsd"default-lazy-init="true"><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>26</value></constructor-arg><!--最大字体--><constructor-arg index="1"><value>34</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>110</value></constructor-arg><!--背景高度--><constructor-arg index="1"><value>50</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，在web.xml配置servlet

<servlet><servlet-name>captcha</servlet-name><servlet-class>cn.itcast.common.JcaptchaServlet</servlet-class></servlet><servlet-mapping><servlet-name>captcha</servlet-name><url-pattern>/captcha.svl</url-pattern></servlet-mapping></web-app>

4.创建一个session共享类，用于创建session，获取session和销毁session 并交给spring管理

package cn.itcast.common.web;import java.io.Serializable;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;public class HttpSessionProvide implements SessionProvider{public void setAttribute(HttpServletRequest request, String name, Serializable value) {HttpSession session = request.getSession();session.setAttribute(name, value);}public Serializable getAttribute(HttpServletRequest request, String name) {HttpSession session = request.getSession(false);if (session != null) {return(Serializable) session.getAttribute(name);}return null;}public void logout(HttpServletRequest request) {HttpSession session = request.getSession(false);if (session != null) {session.invalidate();}}public String getSessionId(HttpServletRequest request) {return request.getSession().getId();}}

在spring里面注入

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- session实例化--><bean id="sessionProvider" class="cn.itcast.common.web.HttpSessionProvide"></bean> </beans>

最后获取生成的验证吗图片

<img src="/captcha.svl" onclick="this.src='captcha.svl?d='+new Date()" class="code" alt="换一张" /><a href="javascript:void(0);" onclick="$('.code').attr('src','/captcha.svl?d='+new Date())" title="换一张">换一张</a></li>

效果图