Shiro集成SSM基于动态URL权限管理(二)

这个案例基于上一个demo扩展而来。所以数据库表，在Shiro集成SSM基于URL权限管理(一)开篇的一致。如果上个demo操作的建议重新导入一次，避免出现问题。

而这次都不是通过固定写在方法上的注解实现的，而是通过权限灵活配置实现的。

PageController.java

首先是PageController.java 里原本通过注解方式的@RequiresPermissions和@RequiresRoles 注释掉了。

 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;

 //专门用于显示页面的控制器
 @Controller
 @RequestMapping("")
 public class PageController {

     @RequestMapping("index")
     public String index(){
         return "index";
     }

 //  @RequiresPermissions("deleteOrder")
     @RequestMapping("deleteOrder")
     public String deleteOrder(){
         return "deleteOrder";
     }
 //  @RequiresRoles("productManager")
     @RequestMapping("deleteProduct")
     public String deleteProduct(){
         return "deleteProduct";
     }
     @RequestMapping("listProduct")
     public String listProduct(){
         return "listProduct";
     }

     @RequestMapping(value="/login",method=RequestMethod.GET)
     public String login(){
         return "login";
     }
     @RequestMapping("unauthorized")
     public String noPerms(){
         return "unauthorized";
     }

 }

PermissionService.java

增加了两个方法 needInterceptor，listPermissionURLs

代码如下:

 import java.util.List;
 import java.util.Set;

 import com.how2java.pojo.Permission;
 import com.how2java.pojo.Role;

 public interface PermissionService {
     public Set<String> listPermissions(String userName);

     public List<Permission> list();

     public void add(Permission permission);

     public void delete(Long id);

     public Permission get(Long id);

     public void update(Permission permission);

     public List<Permission> list(Role role);

     public boolean needInterceptor(String requestURI);

     public Set<String> listPermissionURLs(String userName);

 }

PermissionServiceImpl.java

为两个方法 needInterceptor，listPermissionURLs 增加了实现
needInterceptor 表示是否要进行拦截，判断依据是如果访问的某个url,在权限系统里存在，就要进行拦截。 如果不存在，就放行了。
这一种策略，也可以切换成另一个，即，访问的地址如果不存在于权限系统中，就提示没有拦截。 这两种做法没有对错之分，取决于业务上希望如何制定权限策略。

listPermissionURLs(User user) 用来获取某个用户所拥有的权限地址集合

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

 import com.how2java.mapper.PermissionMapper;
 import com.how2java.mapper.RolePermissionMapper;
 import com.how2java.pojo.Permission;
 import com.how2java.pojo.PermissionExample;
 import com.how2java.pojo.Role;
 import com.how2java.pojo.RolePermission;
 import com.how2java.pojo.RolePermissionExample;
 import com.how2java.service.PermissionService;
 import com.how2java.service.RoleService;
 import com.how2java.service.UserService;

 @Service
 public class PermissionServiceImpl implements PermissionService {

     @Autowired
     PermissionMapper permissionMapper;
     @Autowired
     UserService userService;
     @Autowired
     RoleService roleService;
     @Autowired
     RolePermissionMapper rolePermissionMapper;

     @Override
     public Set<String> listPermissions(String userName) {
         Set<String> result = new HashSet<>();
         List<Role> roles = roleService.listRoles(userName);

         List<RolePermission> rolePermissions = new ArrayList<>();

         for (Role role : roles) {
             RolePermissionExample example = new RolePermissionExample();
             example.createCriteria().andRidEqualTo(role.getId());
             List<RolePermission> rps = rolePermissionMapper.selectByExample(example);
             rolePermissions.addAll(rps);
         }

         for (RolePermission rolePermission : rolePermissions) {
             Permission p = permissionMapper.selectByPrimaryKey(rolePermission.getPid());
             result.add(p.getName());
         }

         return result;
     }

     @Override
     public void add(Permission u) {
         permissionMapper.insert(u);
     }

     @Override
     public void delete(Long id) {
         permissionMapper.deleteByPrimaryKey(id);
     }

     @Override
     public void update(Permission u) {
         permissionMapper.updateByPrimaryKeySelective(u);
     }

     @Override
     public Permission get(Long id) {
         return permissionMapper.selectByPrimaryKey(id);
     }

     @Override
     public List<Permission> list() {
         PermissionExample example = new PermissionExample();
         example.setOrderByClause("id desc");
         return permissionMapper.selectByExample(example);

     }

     @Override
     public List<Permission> list(Role role) {
         List<Permission> result = new ArrayList<>();
         RolePermissionExample example = new RolePermissionExample();
         example.createCriteria().andRidEqualTo(role.getId());
         List<RolePermission> rps = rolePermissionMapper.selectByExample(example);
         for (RolePermission rolePermission : rps) {
             result.add(permissionMapper.selectByPrimaryKey(rolePermission.getPid()));
         }

         return result;
     }

     @Override
     public boolean needInterceptor(String requestURI) {
         List<Permission> ps = list();
         for (Permission p : ps) {
             if (p.getUrl().equals(requestURI))
                 return true;
         }
         return false;
     }

     @Override
     public Set<String> listPermissionURLs(String userName) {
         Set<String> result = new HashSet<>();
         List<Role> roles = roleService.listRoles(userName);

         List<RolePermission> rolePermissions = new ArrayList<>();

         for (Role role : roles) {
             RolePermissionExample example = new RolePermissionExample();
             example.createCriteria().andRidEqualTo(role.getId());
             List<RolePermission> rps = rolePermissionMapper.selectByExample(example);
             rolePermissions.addAll(rps);
         }

         for (RolePermission rolePermission : rolePermissions) {
             Permission p = permissionMapper.selectByPrimaryKey(rolePermission.getPid());
             result.add(p.getUrl());
         }

         return result;
     }

 }

URLPathMatchingFilter.java

PathMatchingFilter 是shiro 内置过滤器 PathMatchingFilter 继承了这个它。
基本思路如下：
1. 如果没登录就跳转到登录
2. 如果当前访问路径没有在权限系统里维护，则允许访问
3. 当前用户所拥有的权限如果不包含当前的访问地址，则跳转到/unauthorized，否则就允许访问。

代码如下:

 import java.util.Set;

 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;

 import org.apache.shiro.SecurityUtils;
 import org.apache.shiro.authz.UnauthorizedException;
 import org.apache.shiro.subject.Subject;
 import org.apache.shiro.web.filter.PathMatchingFilter;
 import org.apache.shiro.web.util.WebUtils;
 import org.springframework.beans.factory.annotation.Autowired;

 import com.how2java.service.PermissionService;

 public class URLPathMatchingFilter extends PathMatchingFilter {
     @Autowired
     PermissionService permissionService;

     @Override
     protected boolean onPreHandle(ServletRequest request, ServletResponse response, Object mappedValue)
             throws Exception {
         String requestURI = getPathWithinApplication(request);

         System.out.println("requestURI:" + requestURI);

         Subject subject = SecurityUtils.getSubject();
         // 如果没有登录，就跳转到登录页面
         if (!subject.isAuthenticated()) {
             WebUtils.issueRedirect(request, response, "/login");
             return false;
         }

         // 看看这个路径权限里有没有维护，如果没有维护，一律放行(也可以改为一律不放行)
         boolean needInterceptor = permissionService.needInterceptor(requestURI);
         if (!needInterceptor) {
             return true;
         } else {
             boolean hasPermission = false;
             String userName = subject.getPrincipal().toString();
             Set<String> permissionUrls = permissionService.listPermissionURLs(userName);
             for (String url : permissionUrls) {
                 // 这就表示当前用户有这个权限
                 if (url.equals(requestURI)) {
                     hasPermission = true;
                     break;
                 }
             }

             if (hasPermission)
                 return true;
             else {
                 UnauthorizedException ex = new UnauthorizedException("当前用户没有访问路径 " + requestURI + " 的权限");

                 subject.getSession().setAttribute("ex", ex);

                 WebUtils.issueRedirect(request, response, "/unauthorized");
                 return false;
             }

         }

     }
 }

applicationContext-shiro.xml

首先声明URLPathMatchingFilter 过滤器

<bean id="urlPathMatchingFilter" class="com.how2java.filter.URLPathMatchingFilter"/>

在shiro中使用这个过滤器

<entry key="url" value-ref="urlPathMatchingFilter" />

过滤规则是所有访问

/** = url

代码如下：

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://www.springframework.org/schema/beans" xmlns:util="http://www.springframework.org/schema/util"
     xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx-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/mvc
     http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/util
     http://www.springframework.org/schema/util/spring-util.xsd">

     <!-- url过滤器 -->
     <bean id="urlPathMatchingFilter" class="com.how2java.filter.URLPathMatchingFilter"/>

     <!-- 配置shiro的过滤器工厂类，id- shiroFilter要和我们在web.xml中配置的过滤器一致 -->
     <bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
         <!-- 调用我们配置的权限管理器 -->
         <property name="securityManager" ref="securityManager" />
         <!-- 配置我们的登录请求地址 -->
         <property name="loginUrl" value="/login" />
         <!-- 如果您请求的资源不再您的权限范围，则跳转到/403请求地址 -->
         <property name="unauthorizedUrl" value="/unauthorized" />
         <!-- 退出 -->
         <property name="filters">
             <util:map>
                 <entry key="logout" value-ref="logoutFilter" />
                 <entry key="url" value-ref="urlPathMatchingFilter" />
             </util:map>
         </property>
         <!-- 权限配置 -->
         <property name="filterChainDefinitions">
             <value>
                 <!-- anon表示此地址不需要任何权限即可访问 -->
                 /login=anon
                 /index=anon
                 /static/**=anon
                 <!-- 只对业务功能进行权限管理，权限配置本身不需要没有做权限要求，这样做是为了不让初学者混淆 -->
                 /config/**=anon
                 /doLogout=logout
                 <!--所有的请求(除去配置的静态资源请求或请求地址为anon的请求)都要通过过滤器url -->
                 /** = url
             </value>
         </property>
     </bean>
     <!-- 退出过滤器 -->
     <bean id="logoutFilter" class="org.apache.shiro.web.filter.authc.LogoutFilter">
         <property name="redirectUrl" value="/index" />
     </bean>

     <!-- 会话ID生成器 -->
     <bean id="sessionIdGenerator"
         class="org.apache.shiro.session.mgt.eis.JavaUuidSessionIdGenerator" />
     <!-- 会话Cookie模板 关闭浏览器立即失效 -->
     <bean id="sessionIdCookie" class="org.apache.shiro.web.servlet.SimpleCookie">
         <constructor-arg value="sid" />
         <property name="httpOnly" value="true" />
         <property name="maxAge" value="-1" />
     </bean>
     <!-- 会话DAO -->
     <bean id="sessionDAO"
         class="org.apache.shiro.session.mgt.eis.EnterpriseCacheSessionDAO">
         <property name="sessionIdGenerator" ref="sessionIdGenerator" />
     </bean>
     <!-- 会话验证调度器，每30分钟执行一次验证 ，设定会话超时及保存 -->
     <bean name="sessionValidationScheduler"
         class="org.apache.shiro.session.mgt.ExecutorServiceSessionValidationScheduler">
         <property name="interval" value="1800000" />
         <property name="sessionManager" ref="sessionManager" />
     </bean>
     <!-- 会话管理器 -->
     <bean id="sessionManager"
         class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
         <!-- 全局会话超时时间（单位毫秒），默认30分钟 -->
         <property name="globalSessionTimeout" value="1800000" />
         <property name="deleteInvalidSessions" value="true" />
         <property name="sessionValidationSchedulerEnabled" value="true" />
         <property name="sessionValidationScheduler" ref="sessionValidationScheduler" />
         <property name="sessionDAO" ref="sessionDAO" />
         <property name="sessionIdCookieEnabled" value="true" />
         <property name="sessionIdCookie" ref="sessionIdCookie" />
     </bean>

     <!-- 安全管理器 -->
     <bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
         <property name="realm" ref="databaseRealm" />
         <property name="sessionManager" ref="sessionManager" />
     </bean>
     <!-- 相当于调用SecurityUtils.setSecurityManager(securityManager) -->
     <bean
         class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
         <property name="staticMethod"
             value="org.apache.shiro.SecurityUtils.setSecurityManager" />
         <property name="arguments" ref="securityManager" />
     </bean>

     <!-- 密码匹配器 -->
     <bean id="credentialsMatcher" class="org.apache.shiro.authc.credential.HashedCredentialsMatcher">
         <property name="hashAlgorithmName" value="md5"/>
         <property name="hashIterations" value="2"/>
         <property name="storedCredentialsHexEncoded" value="true"/>
     </bean>

     <bean id="databaseRealm" class="com.how2java.realm.DatabaseRealm">
         <property name="credentialsMatcher" ref="credentialsMatcher"/>
     </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" />
 </beans>

jsp做了些文字上的改动

index.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

 <link rel="stylesheet" type="text/css" href="static/css/style.css" />

 </head>
 <body>

 <div class="workingroom">
     <div class="loginDiv">

     <c:if test="${empty subject.principal}">
         <a href="login">登录</a><br>
     </c:if>
     <c:if test="${!empty subject.principal}">
         <span class="desc">你好，${subject.principal}，</span>
         <a href="doLogout">退出</a><br>
     </c:if>

     <a href="listProduct">查看产品</a><span class="desc">(要有查看产品权限, zhang3有，li4 有)</span><br>
     <a href="deleteProduct">删除产品</a><span  class="desc">(要有删除产品权限, zhang3有，li4 有)</span><br>
     <a href="deleteOrder">删除订单</a><span class="desc">(要有删除订单权限, zhang3有，li4没有)</span><br>
 </div>

 </body>
 </html>

deleteOrder.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8" import="java.util.*"%>

 <!DOCTYPE html>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <link rel="stylesheet" type="text/css" href="static/css/style.css" />

 <div class="workingroom">

     deleteOrder.jsp，能进来<br>就表示拥有 deleteOrder 权限
     <br>
     <a href="#" onClick="javascript:history.back()">返回</a>
 </div>

deleteProduct.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8" import="java.util.*"%>

 <!DOCTYPE html>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <link rel="stylesheet" type="text/css" href="static/css/style.css" />

 <div class="workingroom">

     deleteProduct.jsp，能进来<br>就表示拥有 deleteProduct 权限
     <br>
     <a href="#" onClick="javascript:history.back()">返回</a>
 </div>

listProduct.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8" import="java.util.*"%>

 <!DOCTYPE html>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <link rel="stylesheet" type="text/css" href="static/css/style.css" />

 <div class="workingroom">

     listProduct.jsp，能进来<br>就表示拥有 listProduct 权限
     <br>
     <a href="#" onClick="javascript:history.back()">返回</a>
 </div>

打开浏览器测试，finish。

重启Tomcat测试，业务测试地址：

http://127.0.0.1:8080/shirossm_dynamicURL/index

权限配置测试地址：

http://127.0.0.1:8080/shirossm_dynamicURL/config/listUser

为什么角色不对应URL

权限通过url进行灵活配置了。 但是角色还没有和url对应起来。 为什么不把角色也对应起来呢？
从代码开发的角度讲是可以做的，无非就是在 role表上增加一个url 字段。 但是从权限管理本身的角度看，当一个url 既对应权限表的数据，又对应角色表的数据，反而容易产生混淆。
反倒是现在这种，url地址，仅仅和权限表关联起来，在逻辑上明晰简单，也更容易维护。 所以就放弃了角色表也进行url维护的做法了。

最后，同样地，需要demo的留言私发！！！