shiro +spring + spring mvc+ mybatis整合

sql

CREATE TABLE `sys_permission` (  `id` bigint(20) NOT NULL COMMENT '主键',  `name` varchar(128) NOT NULL COMMENT '资源名称',  `type` varchar(32) NOT NULL COMMENT '资源类型：menu,button,',  `url` varchar(128) DEFAULT NULL COMMENT '访问url地址',  `percode` varchar(128) DEFAULT NULL COMMENT '权限代码字符串',  `parentid` bigint(20) DEFAULT NULL COMMENT '父结点id',  `parentids` varchar(128) DEFAULT NULL COMMENT '父结点id列表串',  `sortstring` varchar(128) DEFAULT NULL COMMENT '排序号',  `available` char(1) DEFAULT NULL COMMENT '是否可用,1：可用，0不可用',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;/*Table structure for table `sys_role` */CREATE TABLE `sys_role` (  `id` varchar(36) NOT NULL,  `name` varchar(128) NOT NULL,  `available` char(1) DEFAULT NULL COMMENT '是否可用,1：可用，0不可用',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;/*Table structure for table `sys_role_permission` */CREATE TABLE `sys_role_permission` (  `id` varchar(36) NOT NULL,  `sys_role_id` varchar(32) NOT NULL COMMENT '角色id',  `sys_permission_id` varchar(32) NOT NULL COMMENT '权限id',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;/*Table structure for table `sys_user` */CREATE TABLE `sys_user` (  `id` varchar(36) NOT NULL COMMENT '主键',  `usercode` varchar(32) NOT NULL COMMENT '账号',  `username` varchar(64) NOT NULL COMMENT '姓名',  `password` varchar(32) NOT NULL COMMENT '密码',  `salt` varchar(64) DEFAULT NULL COMMENT '盐',  `locked` char(1) DEFAULT NULL COMMENT '账号是否锁定，1：锁定，0未锁定',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;CREATE TABLE `items` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `name` varchar(32) NOT NULL COMMENT '商品名称',  `price` float(10,1) NOT NULL COMMENT '商品定价',  `detail` text COMMENT '商品描述',  `pic` varchar(64) DEFAULT NULL COMMENT '商品图片',  `createtime` datetime NOT NULL COMMENT '生产日期',  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

/*Data for the table `sys_permission` */insert  into `sys_permission`(`id`,`name`,`type`,`url`,`percode`,`parentid`,`parentids`,`sortstring`,`available`) values (1,'权限','','',NULL,0,'0/','0','1'),(11,'商品管理','menu','/item/queryItem.action',NULL,1,'0/1/','1.','1'),(12,'商品新增','permission','/item/add.action','item:create',11,'0/1/11/','','1'),(13,'商品修改','permission','/item/editItem.action','item:update',11,'0/1/11/','','1'),(14,'商品删除','permission','','item:delete',11,'0/1/11/','','1'),(15,'商品查询','permission','/item/queryItem.action','item:query',11,'0/1/15/',NULL,'1'),(21,'用户管理','menu','/user/query.action','user:query',1,'0/1/','2.','1'),(22,'用户新增','permission','','user:create',21,'0/1/21/','','1'),(23,'用户修改','permission','','user:update',21,'0/1/21/','','1'),(24,'用户删除','permission','','user:delete',21,'0/1/21/','','1');/*Data for the table `sys_role` */insert  into `sys_role`(`id`,`name`,`available`) values ('ebc8a441-c6f9-11e4-b137-0adc305c3f28','商品管理员','1'),('ebc9d647-c6f9-11e4-b137-0adc305c3f28','用户管理员','1');/*Data for the table `sys_role_permission` */insert  into `sys_role_permission`(`id`,`sys_role_id`,`sys_permission_id`) values ('ebc8a441-c6f9-11e4-b137-0adc305c3f21','ebc8a441-c6f9-11e4-b137-0adc305c','12'),('ebc8a441-c6f9-11e4-b137-0adc305c3f22','ebc8a441-c6f9-11e4-b137-0adc305c','11'),('ebc8a441-c6f9-11e4-b137-0adc305c3f24','ebc9d647-c6f9-11e4-b137-0adc305c','21'),('ebc8a441-c6f9-11e4-b137-0adc305c3f25','ebc8a441-c6f9-11e4-b137-0adc305c','15'),('ebc9d647-c6f9-11e4-b137-0adc305c3f23','ebc9d647-c6f9-11e4-b137-0adc305c','22'),('ebc9d647-c6f9-11e4-b137-0adc305c3f26','ebc8a441-c6f9-11e4-b137-0adc305c','13');/*Data for the table `sys_user` */insert  into `sys_user`(`id`,`usercode`,`username`,`password`,`salt`,`locked`) values ('lisi','lisi','李四','bf07fd8bbc73b6f70b8319f2ebb87483','uiwueylm','0'),('zhangsan','zhangsan','张三','cb571f7bd7a6f73ab004a70322b963d5','eteokues','0');/*Data for the table `sys_user_role` */insert  into `sys_user_role`(`id`,`sys_user_id`,`sys_role_id`) values ('ebc8a441-c6f9-11e4-b137-0adc305c3f28','zhangsan','ebc8a441-c6f9-11e4-b137-0adc305c'),('ebc9d647-c6f9-11e4-b137-0adc305c3f28','lisi','ebc9d647-c6f9-11e4-b137-0adc305c');insert  into `items`(`id`,`name`,`price`,`detail`,`pic`,`createtime`) values (1,'台式机',3000.0,'该电脑质量非常好！！！！',NULL,'2015-02-03 13:22:53'),(2,'笔记本',6000.0,'笔记本性能好，质量好！！！！！',NULL,'2015-02-09 13:22:57'),(3,'背包',200.0,'名牌背包，容量大质量好！！！！',NULL,'2015-02-06 13:23:02');/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.me</groupId><artifactId>shiro-web</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><!-- 添加Servlet支持 --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.1</version></dependency><!-- 添加jtl支持 --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!-- 添加Spring支持 --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>4.1.7.RELEASE</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.2.3</version></dependency><!-- 添加日志支持 --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><!-- 添加mybatis支持 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.3.0</version></dependency><!-- jdbc驱动包 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.38</version></dependency><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-core</artifactId><version>1.2.4</version></dependency><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-ehcache</artifactId><version>1.2.4</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.12</version></dependency><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-web</artifactId><version>1.2.4</version></dependency><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-spring</artifactId><version>1.2.4</version></dependency></dependencies><!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 --><build><resources><resource><directory>src/main/java</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource><resource><directory>src/main/resources</directory><includes><include>**/*.properties</include><include>**/*.xml</include></includes><filtering>false</filtering></resource></resources></build></project>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><display-name>shiro-web</display-name><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><!-- Spring监听器 --><context-param><param-name>contextConfigLocation</param-name><!-- Spring配置文件 --><param-value>classpath:spring/applicationContext.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- shiro的filter --><!-- shiro过虑器，DelegatingFilterProxy通过代理模式将spring容器中的bean和filter关联起来 --><filter><filter-name>shiroFilter</filter-name><filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class><!-- 设置true由servlet容器控制filter的生命周期 --><init-param><param-name>targetFilterLifecycle</param-name><param-value>true</param-value></init-param><!-- 设置spring容器filter的bean id，如果不设置则找与filter-name一致的bean--><init-param><param-name>targetBeanName</param-name><param-value>shiroFilter</param-value></init-param></filter><filter-mapping><filter-name>shiroFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- 添加对springmvc的支持 --><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:spring/spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup><async-supported>true</async-supported></servlet><servlet-mapping><servlet-name>springMVC</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping><!-- post乱码处理 --><filter><filter-name>CharacterEncodingFilter</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><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>

spring-mvc.xml

<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"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd "><!-- 使用spring组件扫描 --><context:component-scan base-package="cn.me.ssm.controller" /><!-- 通过annotation-driven可以替代下边的处理器映射器和适配器 --><mvc:annotation-driven></mvc:annotation-driven><!-- 配置视图解析器 要求将jstl的包加到classpath --><!-- ViewResolver --><beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/" /><property name="suffix" value=".jsp" /></bean><bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">        <property name="exceptionMappings">            <props>                <!-- 无权权限跳转页面 -->                <prop key="org.apache.shiro.authz.UnauthorizedException">refuse</prop>            </props>        </property>    </bean><!-- 定义统一异常处理器 --><bean class="cn.me.ssm.exception.CustomExceptionResolver"></bean><!-- 开启aop，对类代理 --><aop:config proxy-target-class="true"></aop:config><!-- 开启shiro注解支持 --><beanclass="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor"><property name="securityManager" ref="securityManager" /></bean></beans>

spring-shiro.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" xmlns:p="http://www.springframework.org/schema/p"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd          http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd          http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"><!-- Shiro过滤器 --><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" /><!-- loginUrl认证提交地址，如果没有认证将会请求此地址进行认证，请求此地址将由formAuthenticationFilter进行表单认证 --><property name="loginUrl" value="/login.do" /><!-- 认证成功统一跳转到first.action，建议不配置，shiro认证成功自动到上一个请求路径 --><property name="successUrl" value="/first.do" /><!-- 通过unauthorizedUrl指定没有权限操作时跳转页面 --><property name="unauthorizedUrl" value="/refuse.jsp" /><!-- Shiro连接约束配置,即过滤链的定义 --><property name="filterChainDefinitions"><value><!-- /** = anon所有url都可以匿名访问 --><!-- 对静态资源设置匿名访问 -->/images/** = anon/js/** = anon/styles/** = anon<!-- 验证码，可匿名访问 -->/validatecode.jsp = anon<!-- 请求 logout.action地址，shiro去清除session -->/logout.action = logout<!--商品查询需要商品查询权限 ，取消url拦截配置，使用注解授权方式 --><!-- /items/queryItems.action = perms[item:query] --><!-- /** = authc 所有url都必须认证通过才可以访问 -->/**=authc</value></property></bean><!-- 安全管理器 --><bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">    <!-- 注入自定义Realm --><property name="realm" ref="customRealm" /><!-- 注入缓存管理器 --><property name="cacheManager" ref="cacheManager"/></bean><!-- 自定义Realm --><bean id="customRealm" class="cn.me.ssm.shiro.CustomRealm"><!-- 将凭证匹配器设置到realm中，realm按照凭证匹配器的要求进行散列 --><property name="credentialsMatcher" ref="credentialsMatcher" /></bean><!-- 凭证匹配器 --><bean id="credentialsMatcher"class="org.apache.shiro.authc.credential.HashedCredentialsMatcher"><property name="hashAlgorithmName" value="md5" /><property name="hashIterations" value="1" /></bean><!-- 缓存管理器 --><bean id="cacheManager" class="org.apache.shiro.cache.ehcache.EhCacheManager"><property name="cacheManagerConfigFile" value="classpath:shiro-ehcache.xml" /></bean></beans>

package cn.me.ssm.shiro;import java.util.ArrayList;import java.util.List;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.authz.AuthorizationInfo;import org.apache.shiro.authz.SimpleAuthorizationInfo;import org.apache.shiro.realm.AuthorizingRealm;import org.apache.shiro.subject.PrincipalCollection;import org.apache.shiro.util.ByteSource;import org.springframework.beans.factory.annotation.Autowired;import cn.me.ssm.po.ActiveUser;import cn.me.ssm.po.SysPermission;import cn.me.ssm.po.SysUser;import cn.me.ssm.service.SysService;/** * 自定义realm *  * @author Administrator * */public class CustomRealm extends AuthorizingRealm {@Autowiredprivate SysService sysService;@Overridepublic void setName(String name) {// TODO Auto-generated method stubsuper.setName("customRealm");}// 用于认证@Overrideprotected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {// token是用户输入的// 第一步从token中取出身份信息String userCode = (String) token.getPrincipal();SysUser sysUser = null;// 第二步：根据用户输入的userCode从数据库查询try {sysUser = sysService.findSysUserByUserCode(userCode);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}// 如果查询不到返回nullif (sysUser == null) {return null;}// 从数据库查询加密后密码String password = sysUser.getPassword();// 盐String salt = sysUser.getSalt();ActiveUser activeUser = new ActiveUser();activeUser.setUserid(sysUser.getId());activeUser.setUsercode(sysUser.getUsercode());activeUser.setUsername(sysUser.getUsername());// 根据用户id取出菜单List<SysPermission> menus = null;try {menus = sysService.findMenuListByUserId(sysUser.getId());} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}activeUser.setMenus(menus);// 如果查询到返回认证信息AuthenticationInfoSimpleAuthenticationInfo authenticationInfo = new SimpleAuthenticationInfo(activeUser, password,ByteSource.Util.bytes(salt), this.getName());return authenticationInfo;}// 用于授权@Overrideprotected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {// TODO Auto-generated method stub// 从principals获取主身份信息// 将getPrimaryPrincipal方法返回值转为真实身份类型// (在上边doGetAuthenticationInfo认证通过填充到SimpleAuthenticationInfo中的身份类型)ActiveUser activeUser = (ActiveUser) principals.getPrimaryPrincipal();// 根据身份信息获取权限信息// 从数据库获取到权限数据List<SysPermission> permissionList = null;try {permissionList = sysService.findPermissionListByUserId(activeUser.getUserid());} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}List<String> permissions = new ArrayList<>();if (permissionList != null) {// 将数据库查到权限标签符放到集合for (SysPermission permission : permissionList) {permissions.add(permission.getPercode());}}// 将查询到授权信息填充到simpleAuthorizationInfo对象中SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();simpleAuthorizationInfo.addStringPermissions(permissions);// 返回授权信息return simpleAuthorizationInfo;}// 清除缓存public void clearCached() {PrincipalCollection principals = SecurityUtils.getSubject().getPrincipals();super.clearCache(principals);}}

设置凭证匹配器


数据库中存储到的md5的散列值，在realm中需要设置数据库中的散列值它使用散列算法 及散列次数，让shiro进行散列对比时和原始数据库中的散列值使用的算法 一致。

<!-- 凭证匹配器 --><bean id="credentialsMatcher"class="org.apache.shiro.authc.credential.HashedCredentialsMatcher"><property name="hashAlgorithmName" value="md5" /><property name="hashIterations" value="1" /></bean>

授权
修改realm的doGetAuthorizationInfo，从数据库查询权限信息。
使用注解式授权方法。

// 商品信息方法@RequestMapping("/queryItems")@RequiresPermissions("item:query") // 执行queryItems需要"item:query"权限public ModelAndView queryItems(HttpServletRequest request)

springmvc.xml

<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">        <property name="exceptionMappings">            <props>                <!-- 无权权限跳转页面 -->                <prop key="org.apache.shiro.authz.UnauthorizedException">refuse</prop>            </props>        </property>    </bean><!-- 开启aop，对类代理 --><aop:config proxy-target-class="true"></aop:config><!-- 开启shiro注解支持 --><beanclass="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor"><property name="securityManager" ref="securityManager" /></bean>

使用jsp标签授权方法。

<%@ taglib uri="http://shiro.apache.org/tags" prefix="shiro" %>

<!-- 有item:update权限才显示修改链接，没有该 权限不显示，相当 于if(hasPermission(item:update)) --> <shiro:hasPermission name="item:update"> <a href="${pageContext.request.contextPath }/items/editItems.do?id=${item.id}">修改</a> </shiro:hasPermission> 

jsp标签 授权


Jsp页面添加：
<%@ tagliburi="http://shiro.apache.org/tags" prefix="shiro" %>


标签名称 标签条件（均是显示标签内容）
<shiro:authenticated>  登录之后
<shiro:notAuthenticated> 不在登录状态时
<shiro:guest> 用户在没有RememberMe时
<shiro:user>  用户在RememberMe时
<shiro:hasAnyRoles name="abc,123" >  在有abc或者123角色时
<shiro:hasRole name="abc"> 拥有角色abc
<shiro:lacksRole name="abc">  没有角色abc
<shiro:hasPermission name="abc"> 拥有权限资源abc
<shiro:lacksPermission name="abc"> 没有abc权限资源
<shiro:principal>  显示用户身份名称
 <shiro:principal property="username"/>     显示用户身份中的属性值

授权测试


当调用controller的一个方法，由于该 方法加了@RequiresPermissions("item:query") ，shiro调用realm获取数据库中的权限信息，看"item:query"是否在权限数据中存在，如果不存在就拒绝访问，如果存在就授权通过。


当展示一个jsp页面时，页面中如果遇到<shiro:hasPermission name="item:update">，shiro调用realm获取数据库中的权限信息，看item:update是否在权限数据中存在，如果不存在就拒绝访问，如果存在就授权通过。


问题：只要遇到注解或jsp标签的授权，都会调用realm方法查询数据库，需要使用缓存解决此问题。

shiro缓存

针对上边授权频繁查询数据库，需要使用shiro缓存。

缓存流程

shiro中提供了对认证信息和授权信息的缓存。shiro默认是关闭认证信息缓存的，对于授权信息的缓存shiro默认开启的。主要研究授权信息缓存，因为授权的数据量大。


用户认证通过。
该 用户第一次授权：调用realm查询数据库
该 用户第二次授权：不调用realm查询数据库，直接从缓存中取出授权信息（权限标识符）。

添加jar

<dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-ehcache</artifactId><version>1.2.4</version></dependency>

<!-- 安全管理器 --><bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">    <!-- 注入自定义Realm --><property name="realm" ref="customRealm" /><!-- 注入缓存管理器 --><property name="cacheManager" ref="cacheManager"/></bean><!-- 缓存管理器 --><bean id="cacheManager" class="org.apache.shiro.cache.ehcache.EhCacheManager"><property name="cacheManagerConfigFile" value="classpath:shiro-ehcache.xml" /></bean>

shiro-ehcache.xml

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:noNamespaceSchemaLocation="../config/ehcache.xsd"><!--diskStore：缓存数据持久化的目录 地址  --><diskStore path="F:\develop\ehcache" /><defaultCache maxElementsInMemory="1000" maxElementsOnDisk="10000000"eternal="false" overflowToDisk="false" diskPersistent="false"timeToIdleSeconds="120"timeToLiveSeconds="120" diskExpiryThreadIntervalSeconds="120"memoryStoreEvictionPolicy="LRU"></defaultCache></ehcache>

缓存清空如果用户正常退出，缓存自动清空。如果用户非正常退出，缓存自动清空。如果修改了用户的权限，而用户不退出系统，修改的权限无法立即生效。需要手动进行编程实现：在权限修改后调用realm的clearCache方法清除缓存。下边的代码正常开发时要放在service中调用。在service中，权限修改后调用realm的方法。在realm中定义clearCached方法：

//清除缓存public void clearCached() {PrincipalCollection principals = SecurityUtils.getSubject().getPrincipals();super.clearCache(principals);}测试清除缓存controller方法：

@Controllerpublic class ClearShiroCache {// 注入realm@Autowiredprivate CustomRealm customRealm;@RequestMapping("/clearShiroCache")public String clearShiroCache() {// 清除缓存，将来正常开发要在service调用customRealm.clearCached()customRealm.clearCached();return "success";}}

 sessionManager 

和shiro整合后，使用shiro的session管理，shiro提供sessionDao操作 会话数据。

配置sessionManager

<!-- 会话管理器 -->    <bean id="sessionManager" class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">        <!-- session的失效时长，单位毫秒 -->        <property name="globalSessionTimeout" value="600000"/>        <!-- 删除失效的session -->        <property name="deleteInvalidSessions" value="true"/>    </bean>

<!-- 安全管理器 --><bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">    <!-- 注入自定义Realm --><property name="realm" ref="customRealm" /><!-- 注入缓存管理器 --><property name="cacheManager" ref="cacheManager"/><!-- 注入session管理器 --><property name="sessionManager" ref="sessionManager" /></bean>