SpringMVC整合Shiro

这里用的是SpringMVC-3.2.4和Shiro-1.2.2:

首先是web.xml

<span style="color:#663366;"><?xml version="1.0" encoding="UTF-8"?>  
<web-app version="2.5"  
    xmlns="http://java.sun.com/xml/ns/javaee"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  
    <!-- 指定Spring的配置文件 -->  
    <!-- 否则Spring会默认从WEB-INF下寻找配置文件,contextConfigLocation属性是Spring内部固定的 -->  
    <!-- 通过ContextLoaderListener的父类ContextLoader的第120行发现CONFIG_LOCATION_PARAM固定为contextConfigLocation -->  
    <context-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>classpath:applicationContext.xml</param-value>  
    </context-param>  
  
    <!-- 防止发生java.beans.Introspector内存泄露,应将它配置在ContextLoaderListener的前面 -->  
    <!-- 详细描述见http://blog.csdn.net/jadyer/article/details/11991457 -->  
    <listener>  
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  
    </listener>  
      
    <!-- 实例化Spring容器 -->  
    <!-- 应用启动时,该监听器被执行,它会读取Spring相关配置文件,其默认会到WEB-INF中查找applicationContext.xml -->  
    <listener>  
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
    </listener>  
  
    <!-- 解决乱码问题 -->  
    <filter>  
        <filter-name>SpringEncodingFilter</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>  
    <filter-mapping>  
        <filter-name>SpringEncodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
      
    <!-- 配置Shiro过滤器,先让Shiro过滤系统接收到的请求 -->  
    <!-- 这里filter-name必须对应applicationContext.xml中定义的<bean id="shiroFilter"/> -->  
    <!-- 使用[/*]匹配所有请求,保证所有的可控请求都经过Shiro的过滤 -->  
    <!-- 通常会将此filter-mapping放置到最前面(即其他filter-mapping前面),以保证它是过滤器链中第一个起作用的 -->  
    <filter>  
        <filter-name>shiroFilter</filter-name>  
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>  
        <init-param>  
            <!-- 该值缺省为false,表示生命周期由SpringApplicationContext管理,设置为true则表示由ServletContainer管理 -->  
            <param-name>targetFilterLifecycle</param-name>  
            <param-value>true</param-value>  
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>shiroFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
  
    <!-- SpringMVC核心分发器 -->  
    <servlet>  
        <servlet-name>SpringMVC</servlet-name>  
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
        <init-param>  
            <param-name>contextConfigLocation</param-name>  
            <param-value>classpath:applicationContext.xml</param-value>  
        </init-param>  
        <load-on-startup>1</load-on-startup>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>SpringMVC</servlet-name>  
        <url-pattern>/</url-pattern>  
    </servlet-mapping>  
  
    <!-- 默认欢迎页 -->  
    <!-- Servlet2.5中可直接在此处执行Servlet应用,如<welcome-file>servlet/InitSystemParamServlet</welcome-file> -->  
    <!-- 这里使用了SpringMVC提供的<mvc:view-controller>标签,实现了首页隐藏的目的,详见applicationContext.xml -->  
    <!--   
    <welcome-file-list>  
        <welcome-file>login.jsp</welcome-file>  
    </welcome-file-list>  
     -->  
      
    <error-page>  
        <error-code>405</error-code>  
        <location>/WEB-INF/405.html</location>  
    </error-page>  
    <error-page>  
        <error-code>404</error-code>  
        <location>/WEB-INF/404.jsp</location>  
    </error-page>  
    <error-page>  
        <error-code>500</error-code>  
        <location>/WEB-INF/500.jsp</location>  
    </error-page>  
    <error-page>  
        <error-code>java.lang.Throwable</error-code>  
        <location>/WEB-INF/500.jsp</location>  
    </error-page>  
</web-app></span>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
    <head>  
        <title>405.html</title>  
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">  
    </head>  
    <body>  
        <font color="blue">  
            Request method 'GET' not supported  
            <br/><br/>  
            The specified HTTP method is not allowed for the requested resource.  
        </font>  
    </body>  
</html> 

<%@ page language="java" pageEncoding="UTF-8"%>  
  
<script type="text/javascript">  
<!--  
function reloadVerifyCode(){  
    document.getElementById('verifyCodeImage').setAttribute('src', '${pageContext.request.contextPath}/mydemo/getVerifyCodeImage');  
}  
//-->  
</script>  
  
<div style="color:red; font-size:22px;">${message_login}</div>  
  
<form action="<%=request.getContextPath()%>/mydemo/login" method="POST">  
    姓名：<input type="text" name="username"/><br/>  
    密码：<input type="text" name="password"/><br/>  
    验证：<input type="text" name="verifyCode"/>  
             
         <img id="verifyCodeImage" onclick="reloadVerifyCode()" src="<%=request.getContextPath()%>/mydemo/getVerifyCodeImage"/><br/>  
    <input type="submit" value="确认"/>  
</form> 

    <%@ page language="java" pageEncoding="UTF-8"%>  
    普通用户可访问<a href="<%=request.getContextPath()%>/mydemo/getUserInfo" target="_blank">用户信息页面</a>  
    <br/>  
    <br/>  
    管理员可访问<a href="<%=request.getContextPath()%>/admin/listUser.jsp" target="_blank">用户列表页面</a>  
    <br/>  
    <br/>  
    <a href="<%=request.getContextPath()%>/mydemo/logout" target="_blank">Logout</a>  

<%@ page language="java" pageEncoding="UTF-8"%>  
This is listUser.jsp  
<br/>  
<br/>  
<a href="<%=request.getContextPath()%>/mydemo/logout" target="_blank">Logout</a> 

    <%@ page language="java" pageEncoding="UTF-8"%>  
    当前登录的用户为${currUser}  
    <br/>  
    <br/>  
    <a href="<%=request.getContextPath()%>/mydemo/logout" target="_blank">Logout</a>  

    #use Root for GobalConfig  
    log4j.rootLogger=DEBUG,CONSOLE  
      
    log4j.logger.java.sql=DEBUG  
    log4j.logger.org.apache.shiro=DEBUG  
    log4j.logger.org.apache.commons=DEBUG  
    log4j.logger.org.springframework=DEBUG  
      
    #use ConsoleAppender for ConsoleOut  
    log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender  
    log4j.appender.CONSOLE.Threshold=DEBUG  
    log4j.appender.CONSOLE.Target=System.out  
    log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout  
    log4j.appender.CONSOLE.layout.ConversionPattern=[%d{yyyyMMdd HH:mm:ss}][%t][%C{1}.%M]%m%n  

<?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:mvc="http://www.springframework.org/schema/mvc"  
    xmlns:context="http://www.springframework.org/schema/context"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans  
                        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd  
                        http://www.springframework.org/schema/mvc  
                        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd  
                        http://www.springframework.org/schema/context  
                        http://www.springframework.org/schema/context/spring-context-3.2.xsd">  
    <!-- 它背后注册了很多用于解析注解的处理器,其中就包括<context:annotation-config/>配置的注解所使用的处理器 -->  
    <!-- 所以配置了<context:component-scan base-package="">之后,便无需再配置<context:annotation-config> -->  
    <context:component-scan base-package="com.jadyer"/>  
      
    <!-- 启用SpringMVC的注解功能,它会自动注册HandlerMapping、HandlerAdapter、ExceptionResolver的相关实例 -->  
    <mvc:annotation-driven/>  
  
    <!-- 配置SpringMVC的视图解析器 -->  
    <!-- 其viewClass属性的默认值就是org.springframework.web.servlet.view.JstlView -->  
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <property name="prefix" value="/"/>  
        <property name="suffix" value=".jsp"/>  
    </bean>  
  
    <!-- 默认访问跳转到登录页面(即定义无需Controller的url<->view直接映射) -->  
    <mvc:view-controller path="/" view-name="forward:/login.jsp"/>  
  
    <!-- 由于web.xml中设置是：由SpringMVC拦截所有请求,于是在读取静态资源文件的时候就会受到影响(说白了就是读不到) -->  
    <!-- 经过下面的配置，该标签的作用就是：所有页面中引用"/js/**"的资源，都会从"/resources/js/"里面进行查找 -->  
    <!-- 我们可以访问http://IP:8080/xxx/js/my.css和http://IP:8080/xxx/resources/js/my.css对比出来 -->  
    <mvc:resources mapping="/js/**" location="/resources/js/"/>  
    <mvc:resources mapping="/css/**" location="/resources/css/"/>  
    <mvc:resources mapping="/WEB-INF/**" location="/WEB-INF/"/>  
  
    <!-- SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException -->  
    <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的，而且此时还没有进入到Controller方法中 -->  
    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">  
        <property name="exceptionMappings">  
            <props>  
                <!-- 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/error_fileupload.jsp页面 -->  
                <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">WEB-INF/error_fileupload</prop>  
                <!-- 处理其它异常(包括Controller抛出的) -->  
                <prop key="java.lang.Throwable">WEB-INF/500</prop>  
            </props>  
        </property>  
    </bean>  
  
    <!-- 继承自AuthorizingRealm的自定义Realm,即指定Shiro验证用户登录的类为自定义的ShiroDbRealm.java -->  
    <bean id="myRealm" class="com.jadyer.realm.MyRealm"/>  
  
    <!-- Shiro默认会使用Servlet容器的Session,可通过sessionMode属性来指定使用Shiro原生Session -->  
    <!-- 即<property name="sessionMode" value="native"/>,详细说明见官方文档 -->  
    <!-- 这里主要是设置自定义的单Realm应用,若有多个Realm,可使用'realms'属性代替 -->  
    <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">  
        <property name="realm" ref="myRealm"/>  
    </bean>  
  
    <!-- Shiro主过滤器本身功能十分强大,其强大之处就在于它支持任何基于URL路径表达式的、自定义的过滤器的执行 -->  
    <!-- Web应用中,Shiro可控制的Web请求必须经过Shiro主过滤器的拦截,Shiro对基于Spring的Web应用提供了完美的支持 -->  
    <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">  
        <!-- Shiro的核心安全接口,这个属性是必须的 -->  
        <property name="securityManager" ref="securityManager"/>  
        <!-- 要求登录时的链接(可根据项目的URL进行替换),非必须的属性,默认会自动寻找Web工程根目录下的"/login.jsp"页面 -->  
        <property name="loginUrl" value="/"/>  
        <!-- 登录成功后要跳转的连接(本例中此属性用不到,因为登录成功后的处理逻辑在LoginController里硬编码为main.jsp了) -->  
        <!-- <property name="successUrl" value="/system/main"/> -->  
        <!-- 用户访问未对其授权的资源时,所显示的连接 -->  
        <!-- 若想更明显的测试此属性可以修改它的值,如unauthor.jsp,然后用[玄玉]登录后访问/admin/listUser.jsp就看见浏览器会显示unauthor.jsp -->  
        <property name="unauthorizedUrl" value="/"/>  
        <!-- Shiro连接约束配置,即过滤链的定义 -->  
        <!-- 此处可配合我的这篇文章来理解各个过滤连的作用http://blog.csdn.net/jadyer/article/details/12172839 -->  
        <!-- 下面value值的第一个'/'代表的路径是相对于HttpServletRequest.getContextPath()的值来的 -->  
        <!-- anon：它对应的过滤器里面是空的,什么都没做,这里.do和.jsp后面的*表示参数,比方说login.jsp?main这种 -->  
        <!-- authc：该过滤器下的页面必须验证后才能访问,它是Shiro内置的一个拦截器org.apache.shiro.web.filter.authc.FormAuthenticationFilter -->  
        <property name="filterChainDefinitions">  
            <value>  
                /mydemo/login=anon  
                /mydemo/getVerifyCodeImage=anon  
                /main**=authc  
                /user/info**=authc  
                /admin/listUser**=authc,perms[admin:manage]  
            </value>  
        </property>  
    </bean>  
  
    <!-- 保证实现了Shiro内部lifecycle函数的bean执行 -->  
    <bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"/>  
  
    <!-- 开启Shiro的注解(如@RequiresRoles,@RequiresPermissions),需借助SpringAOP扫描使用Shiro注解的类,并在必要时进行安全逻辑验证 -->  
    <!-- 配置以下两个bean即可实现此功能 -->  
    <!-- Enable Shiro Annotations for Spring-configured beans. Only run after the lifecycleBeanProcessor has run -->  
    <!-- 由于本例中并未使用Shiro注解,故注释掉这两个bean(个人觉得将权限通过注解的方式硬编码在程序中,查看起来不是很方便,没必要使用) -->  
    <!--   
    <bean class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator" depends-on="lifecycleBeanPostProcessor"/>  
    <bean class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor">  
        <property name="securityManager" ref="securityManager"/>  
    </bean>  
     -->  
</beans> 

package com.jadyer.realm;  
  
import org.apache.commons.lang3.builder.ReflectionToStringBuilder;  
import org.apache.commons.lang3.builder.ToStringStyle;  
import org.apache.shiro.SecurityUtils;  
import org.apache.shiro.authc.AuthenticationException;  
import org.apache.shiro.authc.AuthenticationInfo;  
import org.apache.shiro.authc.AuthenticationToken;  
import org.apache.shiro.authc.SimpleAuthenticationInfo;  
import org.apache.shiro.authc.UsernamePasswordToken;  
import org.apache.shiro.authz.AuthorizationInfo;  
import org.apache.shiro.authz.SimpleAuthorizationInfo;  
import org.apache.shiro.realm.AuthorizingRealm;  
import org.apache.shiro.session.Session;  
import org.apache.shiro.subject.PrincipalCollection;  
import org.apache.shiro.subject.Subject;  
  
/** 
 * 自定义的指定Shiro验证用户登录的类 
 * @see 在本例中定义了2个用户:jadyer和玄玉,jadyer具有admin角色和admin:manage权限,玄玉不具有任何角色和权限 
 * @create Sep 29, 2013 3:15:31 PM 
 * @author 玄玉<http://blog.csdn.net/jadyer> 
 */  
public class MyRealm extends AuthorizingRealm {  
    /** 
     * 为当前登录的Subject授予角色和权限 
     * @see 经测试:本例中该方法的调用时机为需授权资源被访问时 
     * @see 经测试:并且每次访问需授权资源时都会执行该方法中的逻辑,这表明本例中默认并未启用AuthorizationCache 
     * @see 个人感觉若使用了Spring3.1开始提供的ConcurrentMapCache支持,则可灵活决定是否启用AuthorizationCache 
     * @see 比如说这里从数据库获取权限信息时,先去访问Spring3.1提供的缓存,而不使用Shior提供的AuthorizationCache 
     */  
    @Override  
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals){  
        //获取当前登录的用户名,等价于(String)principals.fromRealm(this.getName()).iterator().next()  
        String currentUsername = (String)super.getAvailablePrincipal(principals);  
//      List<String> roleList = new ArrayList<String>();  
//      List<String> permissionList = new ArrayList<String>();  
//      //从数据库中获取当前登录用户的详细信息  
//      User user = userService.getByUsername(currentUsername);  
//      if(null != user){  
//          //实体类User中包含有用户角色的实体类信息  
//          if(null!=user.getRoles() && user.getRoles().size()>0){  
//              //获取当前登录用户的角色  
//              for(Role role : user.getRoles()){  
//                  roleList.add(role.getName());  
//                  //实体类Role中包含有角色权限的实体类信息  
//                  if(null!=role.getPermissions() && role.getPermissions().size()>0){  
//                      //获取权限  
//                      for(Permission pmss : role.getPermissions()){  
//                          if(!StringUtils.isEmpty(pmss.getPermission())){  
//                              permissionList.add(pmss.getPermission());  
//                          }  
//                      }  
//                  }  
//              }  
//          }  
//      }else{  
//          throw new AuthorizationException();  
//      }  
//      //为当前用户设置角色和权限  
//      SimpleAuthorizationInfo simpleAuthorInfo = new SimpleAuthorizationInfo();  
//      simpleAuthorInfo.addRoles(roleList);  
//      simpleAuthorInfo.addStringPermissions(permissionList);  
        SimpleAuthorizationInfo simpleAuthorInfo = new SimpleAuthorizationInfo();  
        //实际中可能会像上面注释的那样从数据库取得  
        if(null!=currentUsername && "jadyer".equals(currentUsername)){  
            //添加一个角色,不是配置意义上的添加,而是证明该用户拥有admin角色    
            simpleAuthorInfo.addRole("admin");  
            //添加权限  
            simpleAuthorInfo.addStringPermission("admin:manage");  
            System.out.println("已为用户[jadyer]赋予了[admin]角色和[admin:manage]权限");  
            return simpleAuthorInfo;  
        }else if(null!=currentUsername && "玄玉".equals(currentUsername)){  
            System.out.println("当前用户[玄玉]无授权");  
            return simpleAuthorInfo;  
        }  
        //若该方法什么都不做直接返回null的话,就会导致任何用户访问/admin/listUser.jsp时都会自动跳转到unauthorizedUrl指定的地址  
        //详见applicationContext.xml中的<bean id="shiroFilter">的配置  
        return null;  
    }  
  
      
    /** 
     * 验证当前登录的Subject 
     * @see 经测试:本例中该方法的调用时机为LoginController.login()方法中执行Subject.login()时 
     */  
    @Override  
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) throws AuthenticationException {  
        //获取基于用户名和密码的令牌  
        //实际上这个authcToken是从LoginController里面currentUser.login(token)传过来的  
        //两个token的引用都是一样的,本例中是org.apache.shiro.authc.UsernamePasswordToken@33799a1e  
        UsernamePasswordToken token = (UsernamePasswordToken)authcToken;  
        System.out.println("验证当前Subject时获取到token为" + ReflectionToStringBuilder.toString(token, ToStringStyle.MULTI_LINE_STYLE));  
//      User user = userService.getByUsername(token.getUsername());  
//      if(null != user){  
//          AuthenticationInfo authcInfo = new SimpleAuthenticationInfo(user.getUsername(), user.getPassword(), user.getNickname());  
//          this.setSession("currentUser", user);  
//          return authcInfo;  
//      }else{  
//          return null;  
//      }  
        //此处无需比对,比对的逻辑Shiro会做,我们只需返回一个和令牌相关的正确的验证信息  
        //说白了就是第一个参数填登录用户名,第二个参数填合法的登录密码(可以是从数据库中取到的,本例中为了演示就硬编码了)  
        //这样一来,在随后的登录页面上就只有这里指定的用户和密码才能通过验证  
        if("jadyer".equals(token.getUsername())){  
            AuthenticationInfo authcInfo = new SimpleAuthenticationInfo("jadyer", "jadyer", this.getName());  
            this.setSession("currentUser", "jadyer");  
            return authcInfo;  
        }else if("玄玉".equals(token.getUsername())){  
            AuthenticationInfo authcInfo = new SimpleAuthenticationInfo("玄玉", "xuanyu", this.getName());  
            this.setSession("currentUser", "玄玉");  
            return authcInfo;  
        }  
        //没有返回登录用户名对应的SimpleAuthenticationInfo对象时,就会在LoginController中抛出UnknownAccountException异常  
        return null;  
    }  
      
      
    /** 
     * 将一些数据放到ShiroSession中,以便于其它地方使用 
     * @see 比如Controller,使用时直接用HttpSession.getAttribute(key)就可以取到 
     */  
    private void setSession(Object key, Object value){  
        Subject currentUser = SecurityUtils.getSubject();  
        if(null != currentUser){  
            Session session = currentUser.getSession();  
            System.out.println("Session默认超时时间为[" + session.getTimeout() + "]毫秒");  
            if(null != session){  
                session.setAttribute(key, value);  
            }  
        }  
    }  
}

    package com.jadyer.controller;  
      
    import java.awt.Color;  
    import java.awt.image.BufferedImage;  
    import java.io.IOException;  
      
    import javax.imageio.ImageIO;  
    import javax.servlet.http.HttpServletRequest;  
    import javax.servlet.http.HttpServletResponse;  
      
    import org.apache.commons.lang3.StringUtils;  
    import org.apache.commons.lang3.builder.ReflectionToStringBuilder;  
    import org.apache.commons.lang3.builder.ToStringStyle;  
    import org.apache.shiro.SecurityUtils;  
    import org.apache.shiro.authc.AuthenticationException;  
    import org.apache.shiro.authc.ExcessiveAttemptsException;  
    import org.apache.shiro.authc.IncorrectCredentialsException;  
    import org.apache.shiro.authc.LockedAccountException;  
    import org.apache.shiro.authc.UnknownAccountException;  
    import org.apache.shiro.authc.UsernamePasswordToken;  
    import org.apache.shiro.subject.Subject;  
    import org.apache.shiro.web.util.WebUtils;  
    import org.springframework.stereotype.Controller;  
    import org.springframework.web.bind.annotation.RequestMapping;  
    import org.springframework.web.bind.annotation.RequestMethod;  
    import org.springframework.web.servlet.view.InternalResourceViewResolver;  
      
    import com.jadyer.util.VerifyCodeUtil;  
      
    /** 
     * 本例中用到的jar文件如下 
     * @see aopalliance.jar 
     * @see commons-lang3-3.1.jar 
     * @see commons-logging-1.1.2.jar 
     * @see log4j-1.2.17.jar 
     * @see shiro-all-1.2.2.jar 
     * @see slf4j-api-1.7.5.jar 
     * @see slf4j-log4j12-1.7.5.jar 
     * @see spring-aop-3.2.4.RELEASE.jar 
     * @see spring-beans-3.2.4.RELEASE.jar 
     * @see spring-context-3.2.4.RELEASE.jar 
     * @see spring-core-3.2.4.RELEASE.jar 
     * @see spring-expression-3.2.4.RELEASE.jar 
     * @see spring-jdbc-3.2.4.RELEASE.jar 
     * @see spring-oxm-3.2.4.RELEASE.jar 
     * @see spring-tx-3.2.4.RELEASE.jar 
     * @see spring-web-3.2.4.RELEASE.jar 
     * @see spring-webmvc-3.2.4.RELEASE.jar 
     * @create Sep 30, 2013 11:10:06 PM 
     * @author 玄玉<http://blog.csdn.net/jadyer> 
     */  
    @Controller  
    @RequestMapping("mydemo")  
    public class LoginController {  
        /** 
         * 获取验证码图片和文本(验证码文本会保存在HttpSession中) 
         */  
        @RequestMapping("/getVerifyCodeImage")  
        public void getVerifyCodeImage(HttpServletRequest request, HttpServletResponse response) throws IOException {  
            //设置页面不缓存  
            response.setHeader("Pragma", "no-cache");  
            response.setHeader("Cache-Control", "no-cache");  
            response.setDateHeader("Expires", 0);  
            String verifyCode = VerifyCodeUtil.generateTextCode(VerifyCodeUtil.TYPE_NUM_ONLY, 4, null);  
            //将验证码放到HttpSession里面  
            request.getSession().setAttribute("verifyCode", verifyCode);  
            System.out.println("本次生成的验证码为[" + verifyCode + "],已存放到HttpSession中");  
            //设置输出的内容的类型为JPEG图像  
            response.setContentType("image/jpeg");  
            BufferedImage bufferedImage = VerifyCodeUtil.generateImageCode(verifyCode, 90, 30, 3, true, Color.WHITE, Color.BLACK, null);  
            //写给浏览器  
            ImageIO.write(bufferedImage, "JPEG", response.getOutputStream());  
        }  
          
          
        /** 
         * 用户登录 
         */  
        @RequestMapping(value="/login", method=RequestMethod.POST)  
        public String login(HttpServletRequest request){  
            String resultPageURL = InternalResourceViewResolver.FORWARD_URL_PREFIX + "/";  
            String username = request.getParameter("username");  
            String password = request.getParameter("password");  
            //获取HttpSession中的验证码  
            String verifyCode = (String)request.getSession().getAttribute("verifyCode");  
            //获取用户请求表单中输入的验证码  
            String submitCode = WebUtils.getCleanParam(request, "verifyCode");  
            System.out.println("用户[" + username + "]登录时输入的验证码为[" + submitCode + "],HttpSession中的验证码为[" + verifyCode + "]");  
            if (StringUtils.isEmpty(submitCode) || !StringUtils.equals(verifyCode, submitCode.toLowerCase())){  
                request.setAttribute("message_login", "验证码不正确");  
                return resultPageURL;  
            }  
            UsernamePasswordToken token = new UsernamePasswordToken(username, password);  
            token.setRememberMe(true);  
            System.out.println("为了验证登录用户而封装的token为" + ReflectionToStringBuilder.toString(token, ToStringStyle.MULTI_LINE_STYLE));  
            //获取当前的Subject  
            Subject currentUser = SecurityUtils.getSubject();  
            try {  
                //在调用了login方法后,SecurityManager会收到AuthenticationToken,并将其发送给已配置的Realm执行必须的认证检查  
                //每个Realm都能在必要时对提交的AuthenticationTokens作出反应  
                //所以这一步在调用login(token)方法时,它会走到MyRealm.doGetAuthenticationInfo()方法中,具体验证方式详见此方法  
                System.out.println("对用户[" + username + "]进行登录验证..验证开始");  
                currentUser.login(token);  
                System.out.println("对用户[" + username + "]进行登录验证..验证通过");  
                resultPageURL = "main";  
            }catch(UnknownAccountException uae){  
                System.out.println("对用户[" + username + "]进行登录验证..验证未通过,未知账户");  
                request.setAttribute("message_login", "未知账户");  
            }catch(IncorrectCredentialsException ice){  
                System.out.println("对用户[" + username + "]进行登录验证..验证未通过,错误的凭证");  
                request.setAttribute("message_login", "密码不正确");  
            }catch(LockedAccountException lae){  
                System.out.println("对用户[" + username + "]进行登录验证..验证未通过,账户已锁定");  
                request.setAttribute("message_login", "账户已锁定");  
            }catch(ExcessiveAttemptsException eae){  
                System.out.println("对用户[" + username + "]进行登录验证..验证未通过,错误次数过多");  
                request.setAttribute("message_login", "用户名或密码错误次数过多");  
            }catch(AuthenticationException ae){  
                //通过处理Shiro的运行时AuthenticationException就可以控制用户登录失败或密码错误时的情景  
                System.out.println("对用户[" + username + "]进行登录验证..验证未通过,堆栈轨迹如下");  
                ae.printStackTrace();  
                request.setAttribute("message_login", "用户名或密码不正确");  
            }  
            //验证是否登录成功  
            if(currentUser.isAuthenticated()){  
                System.out.println("用户[" + username + "]登录认证通过(这里可以进行一些认证通过后的一些系统参数初始化操作)");  
            }else{  
                token.clear();  
            }  
            return resultPageURL;  
        }  
          
          
        /** 
         * 用户登出 
         */  
        @RequestMapping("/logout")  
        public String logout(HttpServletRequest request){  
             SecurityUtils.getSubject().logout();  
             return InternalResourceViewResolver.REDIRECT_URL_PREFIX + "/";  
        }  
    }  

    package com.jadyer.controller;  
      
    import javax.servlet.http.HttpServletRequest;  
      
    import org.springframework.stereotype.Controller;  
    import org.springframework.web.bind.annotation.RequestMapping;  
      
    @Controller  
    @RequestMapping("mydemo")  
    public class UserController {  
        @RequestMapping(value="/getUserInfo")  
        public String getUserInfo(HttpServletRequest request){  
            String currentUser = (String)request.getSession().getAttribute("currentUser");  
            System.out.println("当前登录的用户为[" + currentUser + "]");  
            request.setAttribute("currUser", currentUser);  
            return "/user/info";  
        }  
    }  

<span style="color:#330033;">    package com.jadyer.util;  
      
    import java.awt.Color;  
    import java.awt.Font;  
    import java.awt.Graphics;  
    import java.awt.image.BufferedImage;  
    import java.util.Random;  
      
    /** 
     * 验证码生成器 
     * @see -------------------------------------------------------------------------------------------------------------- 
     * @see 可生成数字、大写、小写字母及三者混合类型的验证码 
     * @see 支持自定义验证码字符数量,支持自定义验证码图片的大小,支持自定义需排除的特殊字符,支持自定义干扰线的数量,支持自定义验证码图文颜色 
     * @see -------------------------------------------------------------------------------------------------------------- 
     * @see 另外,给Shiro加入验证码有多种方式,也可以通过继承修改FormAuthenticationFilter类,通过Shiro去验证验证码 
     * @see 而这里既然使用了SpringMVC,也为了简化操作,就使用此工具生成验证码,并在Controller中处理验证码的校验 
     * @see -------------------------------------------------------------------------------------------------------------- 
     * @create Sep 29, 2013 4:23:13 PM 
     * @author 玄玉<http://blog.csdn.net/jadyer> 
     */  
    public class VerifyCodeUtil {  
        /** 
         * 验证码类型为仅数字,即0~9 
         */  
        public static final int TYPE_NUM_ONLY = 0;  
      
        /** 
         * 验证码类型为仅字母,即大小写字母混合 
         */  
        public static final int TYPE_LETTER_ONLY = 1;  
      
        /** 
         * 验证码类型为数字和大小写字母混合 
         */  
        public static final int TYPE_ALL_MIXED = 2;  
      
        /** 
         * 验证码类型为数字和大写字母混合 
         */  
        public static final int TYPE_NUM_UPPER = 3;  
      
        /** 
         * 验证码类型为数字和小写字母混合 
         */  
        public static final int TYPE_NUM_LOWER = 4;  
      
        /** 
         * 验证码类型为仅大写字母 
         */  
        public static final int TYPE_UPPER_ONLY = 5;  
      
        /** 
         * 验证码类型为仅小写字母 
         */  
        public static final int TYPE_LOWER_ONLY = 6;  
      
        private VerifyCodeUtil(){}  
          
        /** 
         * 生成随机颜色 
         */  
        private static Color generateRandomColor() {  
            Random random = new Random();  
            return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));  
        }  
          
          
        /** 
         * 生成图片验证码 
         * @param type           验证码类型,参见本类的静态属性 
         * @param length         验证码字符长度,要求大于0的整数 
         * @param excludeString  需排除的特殊字符 
         * @param width          图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度) 
         * @param height         图片高度 
         * @param interLine      图片中干扰线的条数 
         * @param randomLocation 每个字符的高低位置是否随机 
         * @param backColor      图片颜色,若为null则表示采用随机颜色 
         * @param foreColor      字体颜色,若为null则表示采用随机颜色 
         * @param lineColor      干扰线颜色,若为null则表示采用随机颜色 
         * @return 图片缓存对象 
         */  
        public static BufferedImage generateImageCode(int type, int length, String excludeString, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor){  
            String textCode = generateTextCode(type, length, excludeString);  
            return generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor, lineColor);  
        }  
          
      
        /** 
         * 生成验证码字符串 
         * @param type          验证码类型,参见本类的静态属性 
         * @param length        验证码长度,要求大于0的整数 
         * @param excludeString 需排除的特殊字符（无需排除则为null） 
         * @return 验证码字符串 
         */  
        public static String generateTextCode(int type, int length, String excludeString){  
            if(length <= 0){  
                return "";  
            }  
            StringBuffer verifyCode = new StringBuffer();  
            int i = 0;  
            Random random = new Random();  
            switch(type){  
                case TYPE_NUM_ONLY:  
                    while(i < length){  
                        int t = random.nextInt(10);  
                        //排除特殊字符  
                        if(null==excludeString || excludeString.indexOf(t+"")<0) {  
                            verifyCode.append(t);  
                            i++;  
                        }  
                    }  
                break;  
                case TYPE_LETTER_ONLY:  
                    while(i < length){  
                        int t = random.nextInt(123);  
                        if((t>=97 || (t>=65&&t<=90)) && (null==excludeString||excludeString.indexOf((char)t)<0)){  
                            verifyCode.append((char)t);  
                            i++;  
                        }  
                    }  
                break;  
                case TYPE_ALL_MIXED:  
                    while(i < length){  
                        int t = random.nextInt(123);  
                        if((t>=97 || (t>=65&&t<=90) || (t>=48&&t<=57)) && (null==excludeString||excludeString.indexOf((char)t)<0)){  
                            verifyCode.append((char)t);  
                            i++;  
                        }  
                    }  
                break;  
                case TYPE_NUM_UPPER:  
                    while(i < length){  
                        int t = random.nextInt(91);  
                        if((t>=65 || (t>=48&&t<=57)) && (null==excludeString || excludeString.indexOf((char)t)<0)){  
                            verifyCode.append((char)t);  
                            i++;  
                        }  
                    }  
                break;  
                case TYPE_NUM_LOWER:  
                    while(i < length){  
                        int t = random.nextInt(123);  
                        if((t>=97 || (t>=48&&t<=57)) && (null==excludeString || excludeString.indexOf((char)t)<0)){  
                            verifyCode.append((char)t);  
                            i++;  
                        }  
                    }  
                break;  
                case TYPE_UPPER_ONLY:  
                    while(i < length){  
                        int t = random.nextInt(91);  
                        if((t >= 65) && (null==excludeString||excludeString.indexOf((char)t)<0)){  
                            verifyCode.append((char)t);  
                            i++;  
                        }  
                    }  
                break;  
                case TYPE_LOWER_ONLY:  
                    while(i < length){  
                        int t = random.nextInt(123);  
                        if((t>=97) && (null==excludeString||excludeString.indexOf((char)t)<0)){  
                            verifyCode.append((char)t);  
                            i++;  
                        }  
                    }  
                break;  
            }  
            return verifyCode.toString();  
        }  
      
        /** 
         * 已有验证码,生成验证码图片 
         * @param textCode       文本验证码 
         * @param width          图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度) 
         * @param height         图片高度 
         * @param interLine      图片中干扰线的条数 
         * @param randomLocation 每个字符的高低位置是否随机 
         * @param backColor      图片颜色,若为null则表示采用随机颜色 
         * @param foreColor      字体颜色,若为null则表示采用随机颜色 
         * @param lineColor      干扰线颜色,若为null则表示采用随机颜色 
         * @return 图片缓存对象 
         */  
        public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor){  
            //创建内存图像  
            BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
            //获取图形上下文  
            Graphics graphics = bufferedImage.getGraphics();  
            //画背景图  
            graphics.setColor(null==backColor ? generateRandomColor() : backColor);  
            graphics.fillRect(0, 0, width, height);  
            //画干扰线  
            Random random = new Random();  
            if(interLine > 0){  
                int x = 0, y = 0, x1 = width, y1 = 0;  
                for(int i=0; i<interLine; i++){  
                    graphics.setColor(null==lineColor ? generateRandomColor() : lineColor);  
                    y = random.nextInt(height);  
                    y1 = random.nextInt(height);  
                    graphics.drawLine(x, y, x1, y1);  
                }  
            }  
            //字体大小为图片高度的80%  
            int fsize = (int)(height * 0.8);  
            int fx = height - fsize;  
            int fy = fsize;  
            //设定字体  
            graphics.setFont(new Font("Default", Font.PLAIN, fsize));  
            //写验证码字符  
            for(int i=0; i<textCode.length(); i++){  
                fy = randomLocation ? (int)((Math.random()*0.3+0.6)*height) : fy;  
                graphics.setColor(null==foreColor ? generateRandomColor() : foreColor);  
                //将验证码字符显示到图象中  
                graphics.drawString(textCode.charAt(i)+"", fx, fy);  
                fx += fsize * 0.9;  
            }  
            graphics.dispose();  
            return bufferedImage;  
        }  
    }  </span>