准备开始
首先导入jar包：jcaptcha-my-1.0
/**
* web 常量
* @author lx
*
*/
public abstract class Constants {
/** 用户 session 的 cookie 名称*/
public static final String SESSION_ID = "JSESSIONID";
}
第一步:创建SessionProvider接口
cn.itcast.common.web.session.SessionProvider
public interface SessionProvider {
public void setAttribute(HttpServletRequest request,String name ,Serializable value);
//获取Session中的值
public Serializable getAttribute(HttpServletRequest request,String name);
//退出登陆
public void logout(HttpServletRequest request,HttpServletResponse response);
//获取Session Id
public String getSessionId(HttpServletRequest request);
}
第二步:创建HttpSessionProvider实现类
cn.itcast.common.web.session.HttpSessionProvider
/**
* Session提供类
* @author lx
*
*/
public class HttpSessionProvider implements SessionProvider{
//往Session中设置值
public void setAttribute(HttpServletRequest request,String name ,Serializable value){
HttpSession session = request.getSession();
if(session != null){
session.setAttribute(name, value);
}
}
//获取Session中的值
public Serializable getAttribute(HttpServletRequest request,String name){
HttpSession session = request.getSession(false);
if(session != null){
return (Serializable) session.getAttribute(name);
}else{
return null;
}
}
//退出登陆
public void logout(HttpServletRequest request,HttpServletResponse response){
HttpSession session = request.getSession(false);
if(session != null){
session.invalidate();
}
Cookie c = new Cookie(Constants.SESSION_ID,null);
c.setMaxAge(0);
response.addCookie(c);
}
//获取Session Id
public String getSessionId(HttpServletRequest request){
return request.getRequestedSessionId();
}
}
第三步:创建classpath:config/utils.xml
<!-- session 提供类 -->
<bean id="sessionProvider" class="cn.itcast.common.web.session.HttpSessionProvider"/>
第四步:创建JcaptchaServlet
第五步:创建classpth:config/captcha.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-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>
第六步:编写JcaptchaServlet
/**
* 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;
@Override
public void init() throws ServletException {
WebApplicationContext appCtx = WebApplicationContextUtils
.getWebApplicationContext(getServletContext());
captchaService = (ImageCaptchaService) BeanFactoryUtils
.beanOfTypeIncludingAncestors(appCtx, ImageCaptchaService.class);
session = (SessionProvider) BeanFactoryUtils
.beanOfTypeIncludingAncestors(appCtx, SessionProvider.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 = 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 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();
}
}
第七步:配置web.xml
<!-- 配置Jcaptcha 验证码-->
<servlet>
<servlet-name>jcaptcha</servlet-name>
<servlet-class>cn.itcast.common.captcha.JcaptchaServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>jcaptcha</servlet-name>
<url-pattern>/captcha.svl</url-pattern>
</servlet-mapping>
第八步:编写登陆页面front_page/buyer/login.jsp
<li>
<label for="captcha">验证码：</label>
<span class="bg_text small">
<input type="text" id="captcha" name="captcha" maxLength="7"/>
</span>
<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>