个人觉得，上篇中讲到的注解的方式来控制方法的访问权限并没有那么灵活，且需要在代码中硬编码，复用性不高，移植会很麻烦，故研究了下从数据库中动态加载权限
即shiro.xml中的ShiroFilterFactoryBean，之前是直接加载apache源码的bean：<bean id="shiroFilter" class="cn.cjq.util.shiro.ShiroPermissionFactory">
现在做出以下自定义shiro的filter 该bean继承ShiroPermissionFactory，重写父类的setFilterChainDefinitions(java.lang.String definitions)方法
首先来看ShiroPermissionFactory源码，配置文件中的property 都是在为ShiroPermissionFactory属性赋值
源码部分：
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// IntelliJ API Decompiler stub source generated from a class file
// Implementation of methods is not available
package org.apache.shiro.spring.web;
public class ShiroFilterFactoryBean implements org.springframework.beans.factory.FactoryBean, org.springframework.beans.factory.config.BeanPostProcessor {
private static final transient org.slf4j.Logger log;
private org.apache.shiro.mgt.SecurityManager securityManager;
private java.util.Map<java.lang.String,javax.servlet.Filter> filters;
private java.util.Map<java.lang.String,java.lang.String> filterChainDefinitionMap;
private java.lang.String loginUrl;
private java.lang.String successUrl;
private java.lang.String unauthorizedUrl;
private org.apache.shiro.web.servlet.AbstractShiroFilter instance;
public ShiroFilterFactoryBean() { /* compiled code */ }
public org.apache.shiro.mgt.SecurityManager getSecurityManager() { /* compiled code */ }
public void setSecurityManager(org.apache.shiro.mgt.SecurityManager securityManager) { /* compiled code */ }
public java.lang.String getLoginUrl() { /* compiled code */ }
public void setLoginUrl(java.lang.String loginUrl) { /* compiled code */ }
public java.lang.String getSuccessUrl() { /* compiled code */ }
public void setSuccessUrl(java.lang.String successUrl) { /* compiled code */ }
public java.lang.String getUnauthorizedUrl() { /* compiled code */ }
public void setUnauthorizedUrl(java.lang.String unauthorizedUrl) { /* compiled code */ }
public java.util.Map<java.lang.String,javax.servlet.Filter> getFilters() { /* compiled code */ }
public void setFilters(java.util.Map<java.lang.String,javax.servlet.Filter> filters) { /* compiled code */ }
public java.util.Map<java.lang.String,java.lang.String> getFilterChainDefinitionMap() { /* compiled code */ }
public void setFilterChainDefinitionMap(java.util.Map<java.lang.String,java.lang.String> filterChainDefinitionMap) { /* compiled code */ }
public void setFilterChainDefinitions(java.lang.String definitions) { /* compiled code */ }
public java.lang.Object getObject() throws java.lang.Exception { /* compiled code */ }
public java.lang.Class getObjectType() { /* compiled code */ }
public boolean isSingleton() { /* compiled code */ }
protected org.apache.shiro.web.filter.mgt.FilterChainManager createFilterChainManager() { /* compiled code */ }
protected org.apache.shiro.web.servlet.AbstractShiroFilter createInstance() throws java.lang.Exception { /* compiled code */ }
private void applyLoginUrlIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }
private void applySuccessUrlIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }
private void applyUnauthorizedUrlIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }
private void applyGlobalPropertiesIfNecessary(javax.servlet.Filter filter) { /* compiled code */ }
public java.lang.Object postProcessBeforeInitialization(java.lang.Object bean, java.lang.String beanName) throws org.springframework.beans.BeansException { /* compiled code */ }
public java.lang.Object postProcessAfterInitialization(java.lang.Object bean, java.lang.String beanName) throws org.springframework.beans.BeansException { /* compiled code */ }
private static final class SpringShiroFilter extends org.apache.shiro.web.servlet.AbstractShiroFilter {
protected SpringShiroFilter(org.apache.shiro.web.mgt.WebSecurityManager webSecurityManager, org.apache.shiro.web.filter.mgt.FilterChainResolver resolver) { /* compiled code */ }
}
}------------------------------------------------------------------------------------------------------------------------------------------------
shiro.xml配置部分内容
<!-- 自定义shiro的filter -->
<bean id="shiroFilter" class="cn.cjq.util.shiro.ShiroPermissionFactory">
<property name="securityManager" ref="securityManager"/>
<property name="loginUrl" value="/login/toLogin.do"/>
<property name="unauthorizedUrl" value="/login/403.do"/>
<property name="filters">
<map>
<entry key="authc" value-ref="formAuthenticationFilter"/>
</map>
</property>
<property name="filterChainDefinitions"> //该部分的值被重写，部分数据从数据库加载
<value>
/login/**=anon
/api/** = authc
/main.do = authc
</value>
</property>
</bean>
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自定义的shiro拦截器ShiroPermissionFactory
package cn.cjq.util.shiro;
import cn.cjq.entity.Menu;
import cn.cjq.service.user.UserService;
import org.apache.shiro.config.Ini;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.util.CollectionUtils;
import org.apache.shiro.web.config.IniFilterChainResolverFactory;
import javax.annotation.Resource;
import java.util.List;
public class ShiroPermissionFactory extends ShiroFilterFactoryBean {
/**配置中的过滤链*/
public static String definitions;
/**权限service*/
@Resource
private UserService userServiceImpl;
/**
* 从数据库动态读取权限
*/
@Override
public void setFilterChainDefinitions(String definitions) {
ShiroPermissionFactory.definitions = definitions;
//数据库动态权限
List<Menu> Menulist= null;
try {
Menulist = userServiceImpl.ListMenu();
} catch (Exception e) {
e.printStackTrace();
}
//拼接所有请求（即url）所需要的权限（认证，权限ID），拼接时必须加入 用来换行，否则无效。
for(Menu menu : Menulist){
//字符串拼接权限
definitions = definitions+menu.getUrl() + " = "+"authc,perms["+menu.getMenuid()+"] ";
}
//从配置文件加载权限配置
Ini ini = new Ini();
ini.load(definitions);
Ini.Section section = ini.getSection(IniFilterChainResolverFactory.URLS);
if (CollectionUtils.isEmpty(section)) {
section = ini.getSection(Ini.DEFAULT_SECTION_NAME);
}
//加入权限集合
setFilterChainDefinitionMap(section);
}
/**
* 从数据库动态加载权限
*/
// public ShiroFilterFactoryBean getShiroFilterFactoryBean() {
// ShiroFilterFactoryBean shiroFilterFactoryBean=null;
// try {
// shiroFilterFactoryBean = new MyShiroFilterFactoryBean();
// //下列属性在配置文件中已配置
//// shiroFilterFactoryBean.setSecurityManager(getDefaultWebSecurityManager());
//// shiroFilterFactoryBean.setLoginUrl("/login");
//// shiroFilterFactoryBean.setSuccessUrl("/index.html");
//// shiroFilterFactoryBean.setUnauthorizedUrl("/403");
// loadShiroFilterChain(shiroFilterFactoryBean);
// } catch (Exception e) {
// e.printStackTrace();
// }
// return shiroFilterFactoryBean;
// }
//
// private void loadShiroFilterChain(ShiroFilterFactoryBean shiroFilterFactoryBean) throws Exception {
// List<Menu> Menulist = userServiceImpl.ListMenu();
// Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>();
// for (Menu menu : Menulist) {
// filterChainDefinitionMap.put(menu.getUrl(),"authc,perms["+menu.getMenuid()+"]");
// }
// //配置文件中已配置
//// filterChainDefinitionMap.put("/login", "anon");
// shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
// }
}
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上述列出的是所有url所需的相对应权限ID，下面是自定义realm中的授权信息，列出当前用户所有的权限ID，通过比较是否存在权限问题。(也可通过角色去比较，暂不做说明)
/**
* 授权信息
*/
@Override
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
String username = (String)principals.getPrimaryPrincipal();
SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
// UserService userService = (UserService) SpringContextUtil.getBean("userServiceImpl");
try {
authorizationInfo.setRoles(userMapper.findUserRoles(username));
authorizationInfo.setStringPermissions(userMapper.findUserPermissions(username));
} catch (Exception e) {
e.printStackTrace();
}
return authorizationInfo;
}
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根据当前用户获取所有权限ID：也可以不根据权限ID，使用别的也可，但必须统一，既然是使用了权限ID，所有查询结果返回权限ID即可
<!-- 根据用户名查询获取权限列表ID -->
<select id="findUserPermissions" resultType="java.lang.String" parameterType="java.lang.String" >
SELECT
m.menuId
FROM mif_user u
LEFT JOIN mif_role_user_ref ur ON u.uerId=ur.userId
LEFT JOIN mif_role r ON r.roleId=ur.roleId
LEFT JOIN mif_role_authority_ref ar ON ar.roleId=r.roleId
LEFT JOIN mif_authority a ON a.authorityId=ar.authorityId
LEFT JOIN mif_authotity_menu_ref mr ON mr.authorityId=ar.authorityId
LEFT JOIN mif_menu m ON m.menuId=mr.menuId
WHERE u.isdelete = 0 AND r.isdelete=0 AND a.isdelete=0 AND m.isdelete=0 AND u.userName = #{0}
</select>
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坑1：上述标红的 未使用，无效果
坑2：在初始化静态拦截的时候存在初始值/person/**= authc，即/person下的所有方法只要通过认证即可请求。但是shiro权限中数据库的动态数据也包含了/person下的方法，是无效的，原因
是自定义的shiro的filter先加载配置文件中的数据，再加载数据库动态数据，存在/person/**= authc在前面时会让部分数据库/person下的url失效，注释掉/person/**= authc即可
<property name="filterChainDefinitions"> //该部分的值被重写，部分数据从数据库加载
<value>
/login/**=anon
/api/** = authc
/main.do = authc
/person/**= authc
</value>
</property>
坑3：该bean只会在系统启动时加载一次，之后不会调用，所有存在任何权限上的变动时，需手动调用setFilterChainDefinitions()方法
PS：要记住在增删改权限数据库时记得调用setFilterChainDefinitions（）方法重新加载
相关url：http://blog.csdn.net/u010351766/article/details/70432227