SpringSecurity授权流程（自己做笔记用的）

目录

一、RABC表的设计

二、查询权限并添加Security中

三、通过注解进行授权

四、授权进行前端访问

一、RABC表的设计

基本概念就是五个表：

用户表：users

角色表：role

权限表：permission

还需要两种关系表，才能通过users知道他的权限

用户_角色表

角色_权限表

用户对应角色，角色对应着权限

二、查询权限并添加Security中

基本的创建mapper，自定义方法（通过用户名来查询权限）

<?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.gq.springsecuritydemo1.mapper.UsersMapper">
    <select id="findByUsername" resultType="com.gq.springsecuritydemo1.pojo.users" parameterType="string">
        select * from users where username=#{username}
    </select>
    <select id="FindPermissionByUsername" parameterType="string" resultType="com.gq.springsecuritydemo1.pojo.permission">
        select distinct permission.pid,permission.permission,permission.url from users left join
            users_role on users.uid=users_role.uid left join
            role on users_role.rid=role.rid left join
            role_permission on role.rid=role_permission.rid left join
            permission on permission.pid=role_permission.pid
             where username=#{username}
    </select>
</mapper>

查询到权限后，接着在UserDetails中将自定义的权限集合转换为Security中的权限集合

//自定义认证服务
@Service
public class MyUserDetailsService implements UserDetailsService {
    @Autowired
    private UsersMapper usersMapper;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        users s=usersMapper.findByUsername(username);
        //查询用户的权限
        if(s==null){
            return null;
        }
        List<permission> permissionList=usersMapper.FindPermissionByUsername(username);
        //将自定义的权限集合转换为Security的权限类型集合
        List<GrantedAuthority> grantedAuthorities=new ArrayList<>();
        //开始遍历添加权限
        for(permission permission:permissionList){
            grantedAuthorities.add(new SimpleGrantedAuthority(permission.getUrl()));
        }
        //封装为UserDetailsService对象
        UserDetails userDetailsService= User.withUsername(s.getUsername())
                .password(s.getPassword())
                .authorities(grantedAuthorities)
                .build();
        return userDetailsService;
    }
}

这里的权限你可以写url路径来进行认证，也可以自己随便写点别的，反正作为标识即可。

三、通过注解进行授权

在控制器中使用注解来进行鉴权前，我们需要再启动类中添加注解

@EnableMethodSecurity

接着通过@PreAuthorize注解进行鉴权

 //测试权限的方法
    @PreAuthorize("hasAnyAuthority('/search')")
    @RequestMapping("/search")
    public String s1(){
        return "查询权限";
    }
    @PreAuthorize("hasAnyAuthority('/update')")
    @RequestMapping("/update")
    public String u1(){
        return "修改权限";
    }

四、授权进行前端访问

在进行前端访问前，我们还需要引入thymeleaf和security的整合包，这里我直接把大致需要的所有依赖都写了（毕竟有时候版本出现问题是真烦）

<dependencies>
<!--        thymeleaf和security的整合包-->
        <dependency>
            <groupId>org.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-springsecurity5</artifactId>
        </dependency>
<!--        springboot起步-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.29</version>
            <scope>runtime</scope>
        </dependency>
<!--        lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
<!--        junit单元测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
<!--        mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.0</version>
        </dependency>
<!--        thymeleaf-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
<!--        springsecurity-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

在thymeleaf中前端鉴权时，别忘了写约束

<!DOCTYPE html>
<!-- 约束-->
<html lang="en" xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity5">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h3 sec:authorize="hasAnyAuthority('/search')">查询</h3>
<h3 sec:authorize="hasAnyAuthority('/update')">修改</h3>
<h3 sec:authorize="hasAnyAuthority('/delete')">删除</h3>
<h3 sec:authorize="hasAnyAuthority('/insert')">添加</h3>
</body>
</html>