基于SSM实现过滤器及拦截器功能，并实现角色权限功能

第一部分  过滤器及拦截器功能的实现

一、导入jar包

在pom.xml文件下写入相应的依赖项，Maven即可自动下载。

1、在<properties></properties>内添加版本号：

    <spring.security.version>5.0.1.RELEASE</spring.security.version>

 

2、在<dependencies></dependencies>内添加依赖项：

       <!--Security-->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>${spring.security.version}</version>
        </dependency>

二、添加过滤器

1、在webapp目录下的web.xml文件中添加过滤器

  <filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

2、将spring-security.xml文件导入至resources目录下

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:security="http://www.springframework.org/schema/security"
       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
    http://www.springframework.org/schema/security
    http://www.springframework.org/schema/security/spring-security.xsd">
 
    <security:global-method-security pre-post-annotations="enabled" jsr250-annotations="enabled" secured-annotations="enabled"></security:global-method-security>
 
    <!-- 配置不拦截的资源 -->
    <security:http pattern="/login.jsp" security="none"/>
    <security:http pattern="/failer.jsp" security="none"/>
    <security:http pattern="/css/**" security="none"/>
    <security:http pattern="/img/**" security="none"/>
    <security:http pattern="/plugins/**" security="none"/>
 
    <!--
    	配置具体的规则
    	auto-config="true"	不用自己编写登录的页面，框架提供默认登录页面
    	use-expressions="false"	是否使用SPEL表达式（没学习过）
    -->
    <!--FIXME 以下是重点-->
 
    <security:http auto-config="true" use-expressions="true">
        <!-- 配置具体的拦截的规则 pattern="请求路径的规则" access="访问系统的人，必须有ROLE_USER的角色" -->
        <security:intercept-url pattern="/**" access="hasAnyRole('ROLE_USER','ROLE_ADMIN')"/>
 
        <security:form-login login-page="/login.jsp"
                             login-processing-url="/login.do"
                            default-target-url="/index.jsp"
                            authentication-failure-url="/failer.jsp"
                            authentication-success-forward-url="/pages/main.jsp"/>
 
        <!-- 关闭跨域请求 -->
        <security:csrf disabled="true"/>
 
        <!--退出并跳转到首页-->
        <security:logout invalidate-session="true" logout-url="/logout.do" logout-success-url="/login.jsp"></security:logout>
 
    </security:http>
 
    <!-- 切换成数据库中的用户名和密码 -->
    <security:authentication-manager>
        <security:authentication-provider user-service-ref="userService">
            <!-- 配置加密的方式
            <security:password-encoder ref="passwordEncoder"/>　-->
        </security:authentication-provider>
    </security:authentication-manager>
 
    <!-- 配置加密类 -->
    <!--<bean id="passwordEncoder" class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder"/>-->
    <!-- <bean id="webexpressionHandler" class="org.springframework.security.web.access.expression.DefaultWebSecurityExpressionHandler" />-->
    <!-- 提供了入门的方式，在内存中存入用户名和密码
    <security:authentication-manager>
    	<security:authentication-provider>
    		<security:user-service>
    			<security:user name="admin" password="{noop}admin" authorities="ROLE_USER"/>
    		</security:user-service>
    	</security:authentication-provider>
    </security:authentication-manager>
    -->
 
</beans>

3、重新配置web.xml下配置的加载类路径

  <!-- 配置加载类路径的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext.xml,classpath*:spring-security.xml</param-value>
  </context-param>

运行Tomcat，进入用户信息管理系统，可实现对非法请求的过滤和拦截

第二部分   角色权限功能的实现

1、在数据库中创建表tb_role与表tb_user_role

2、在bean下创建一个实体类Role.java

package com.zhongruan.bean;

public class Role {
    private int id;
    private String roleName;
    private  String roleDesc;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public String getRoleDesc() {
        return roleDesc;
    }

    public void setRoleDesc(String roleDesc) {
        this.roleDesc = roleDesc;
    }

    @Override
    public String toString() {
        return "Role{" +
                "id=" + id +
                ", roleName='" + roleName + '\'' +
                ", roleDesc='" + roleDesc + '\'' +
                '}';
    }
}

3、创捷接口RoleDao.java

package com.zhongruan.dao;

import com.zhongruan.bean.Role;

import java.util.List;

public interface RoleDao {


    // 在role表中根据userId查询出当前的的用户
    List<Role> findRoleByUserId(int userId);


}

4、UserService.java接口继承UserDetailsService并在UserInfoServiceImpl下实现

public interface UserInfoService extends UserDetailsService

 @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //1.查询当前登录的用户信息
        UserInfo userInfo = userDao.doLogin(username);
//2.查询当前的用户有多少角色
        List<Role> roleList = roleDao.findRoleByUserId(userInfo.getId());
        //3.需要把角色给放入用户中
        userInfo.setRoleList(roleList);

        //4.把查询到的User和Role数据给到Spring-security中的内置对象User来管理
        User user=new User(userInfo.getUsername(),"{noop}"+userInfo.getPassword(),getAuthority(userInfo.getRoleList()));

        return user;
    }

    private Collection<? extends GrantedAuthority> getAuthority(List<Role> roleList) {

        List<SimpleGrantedAuthority> list=new ArrayList<>();
        for (Role role:roleList){
            list.add(new SimpleGrantedAuthority("ROLE_"+role.getRoleName()));
        }
        return list;
    }

5、编写roleMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.zhongruan.dao.UserDao" >

    <select id="findRoleByUserId" parameterType="java.lang.Integer" resultType="com.zhongruan.bean.Role">
        select * from tb_Role where id in (select roleId from tb_user_role where userId=#{userId} )
    </select>
</mapper>

7、改写aside.jsp

<security:authorize access="hasRole('ADMIN')">
						<a
						href="${pageContext.request.contextPath}/user/finAll.do?page=1&size=5"> <i
							class="fa fa-circle-o"></i> 用户管理
					</a>
						</security:authorize>

8、运行Tomcat，检验到权限功能已实现。