第一步，Shiro Filter
在web.xml文件中增加以下代码，确保Web项目中需要权限管理的URL都可以被Shiro拦截过滤。
<!-- Shiro Filter -->
<filter>
<filter-name>shiroFilter</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
<init-param>
<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> 通常将这段代码中的filter-mapping放在所有filter-mapping之前，以达到shiro是第一个对web请求进行拦截过滤之目的。这里的fileter-name应该要和第二步中配置的 Java bean的id一致。
第二步，配置各种Java Bean
在root-context.xml文件中配置Shiro
<?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.xsd">
<!-- Root Context: defines shared resources visible to all other web components -->
<!-- dataSource -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://127.0.0.1:3306/etao_java" />
<property name="username" value="root" />
<property name="password" value="cope9020" />
</bean>
<bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"></bean>
<!-- 数据库保存的密码是使用MD5算法加密的，所以这里需要配置一个密码匹配对象 -->
<bean id="credentialsMatcher" class="org.apache.shiro.authc.credential.Md5CredentialsMatcher"></bean>
<!-- 缓存管理 -->
<bean id="cacheManager" class="org.apache.shiro.cache.MemoryConstrainedCacheManager"></bean>
<!--
使用Shiro自带的JdbcRealm类
指定密码匹配所需要用到的加密对象
指定存储用户、角色、权限许可的数据源及相关查询语句
-->
<bean id="jdbcRealm" class="org.apache.shiro.realm.jdbc.JdbcRealm">
<property name="credentialsMatcher" ref="credentialsMatcher"></property>
<property name="permissionsLookupEnabled" value="true"></property>
<property name="dataSource" ref="dataSource"></property>
<property name="authenticationQuery"
value="SELECT password FROM sec_user WHERE user_name = ?"></property>
<property name="userRolesQuery"
value="SELECT role_name from sec_user_role left join sec_role using(role_id) left join sec_user using(user_id) WHERE user_name = ?"></property>
<property name="permissionsQuery"
value="SELECT permission_name FROM sec_role_permission left join sec_role using(role_id) left join sec_permission using(permission_id) WHERE role_name = ?"></property>
</bean>
<!-- Shiro安全管理器 -->
<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
<property name="realm" ref="jdbcRealm"></property>
<property name="cacheManager" ref="cacheManager"></property>
</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"></property>
<!-- 要求登录时的链接(登录页面地址)，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="/security/login"></property>
<!-- 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) -->
<!-- <property name="successUrl" value="/" ></property> -->
<!-- 用户访问未对其授权的资源时，所显示的连接 -->
<property name="unauthorizedUrl" value="/"></property>
<property name="filterChainDefinitions">
<value>
/security/*=anon
/tag=authc
</value>
</property>
</bean>
<!--
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
-->
<!--
<bean
class="org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator"></bean>
<bean
class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor">
<property name="securityManager" ref="securityManager"></property>
</bean>
-->
</beans> 上述代码中已经对每个java bean的用途做了详细的注释说明，这里仅对FilterChain过滤链的定义详细阐述一下：
- 测试用例中对/security/*的访问是不需要认证控制的，这主要是用于用户登录和退出的
- 测试用例中对/tag的访问是需要认证控制的，就是说只有通过认证的用户才可以访问该资源。如果用户直接在地址栏中访问http://localhost:8880/learning/tag，系统会自动跳转至登录页面，要求用户先进行身份认证。
完成这两步之后，我们可以Run一下程序，如果可以看到以下页面，就表明我们的配置文件没有错误，Shiro和spring MVC的整合已经完成了。后继的步骤可以视为是对整合后的框进行的一个测试。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login Page</title>
</head>
<body>
<h1>login page</h1>
<form id="" action="dologin" method="post">
<label>User Name</label> <input tyep="text" name="userName"
maxLength="40" /> <label>Password</label><input type="password"
name="password" /> <input type="submit" value="login" />
</form>
<%--用于输入后台返回的验证错误信息 --%>
<P><c:out value="${message }" /></P>
</body>
</html> 
后台登录代码
/**
* 实际的登录代码
* 如果登录成功，跳转至首页；登录失败，则将失败信息反馈对用户
*
* @param request
* @param model
* @return
*/
@RequestMapping(value = "/dologin")
public String doLogin(HttpServletRequest request, Model model) {
String msg = "";
String userName = request.getParameter("userName");
String password = request.getParameter("password");
System.out.println(userName);
System.out.println(password);
UsernamePasswordToken token = new UsernamePasswordToken(userName, password);
token.setRememberMe(true);
Subject subject = SecurityUtils.getSubject();
try {
subject.login(token);
if (subject.isAuthenticated()) {
return "redirect:/";
} else {
return "login";
}
} catch (IncorrectCredentialsException e) {
msg = "登录密码错误. Password for account " + token.getPrincipal() + " was incorrect.";
model.addAttribute("message", msg);
System.out.println(msg);
} catch (ExcessiveAttemptsException e) {
msg = "登录失败次数过多";
model.addAttribute("message", msg);
System.out.println(msg);
} catch (LockedAccountException e) {
msg = "帐号已被锁定. The account for username " + token.getPrincipal() + " was locked.";
model.addAttribute("message", msg);
System.out.println(msg);
} catch (DisabledAccountException e) {
msg = "帐号已被禁用. The account for username " + token.getPrincipal() + " was disabled.";
model.addAttribute("message", msg);
System.out.println(msg);
} catch (ExpiredCredentialsException e) {
msg = "帐号已过期. the account for username " + token.getPrincipal() + " was expired.";
model.addAttribute("message", msg);
System.out.println(msg);
} catch (UnknownAccountException e) {
msg = "帐号不存在. There is no user with username of " + token.getPrincipal();
model.addAttribute("message", msg);
System.out.println(msg);
} catch (UnauthorizedException e) {
msg = "您没有得到相应的授权！" + e.getMessage();
model.addAttribute("message", msg);
System.out.println(msg);
}
return "login";
} 
登录成功后，会转至首页，并显示出当前用户名。
登录成功后，会转至首页，并显示出当前用户名。
