前置安排：这里的权限控制使用的是五张 MySQL 表：分别为：
用户表、角色表、权限表、用户角色表（存储用户id和角色id的绑定关系）、角色权限表（存储角色id和权限id的绑定关系）
1、自定义注解，读取自定义的权限码
@Target(ElementType.METHOD) //表示该注解只能用于方法上 @Retention(RetentionPolicy.RUNTIME) //表示注解会在运行时保留 public @interface CheckPermission { String[] value(); // 定义需要的权限 }切面类定义
@Aspect @Component public class PermissionAspect { private final PermissionService permissionService; //private final HttpServletRequest request; public PermissionAspect(PermissionService permissionService) { this.permissionService = permissionService; //this.request = request; } @Before("@annotation(checkPermission)") public void checkUserPermission(JoinPoint joinPoint, CheckPermission checkPermission) throws Exception { // 从请求头中获取用户ID //String userIdHeader = request.getHeader("User-Id"); // if (userIdHeader == null) { // throw new Exception("请求头中未找到 User-Id"); // } Long userId = Long.parseLong("1"); // 获取注解中所需的权限 String[] requiredPermissions = checkPermission.value(); // 校验用户是否具备指定权限 for (String permission : requiredPermissions) { System.out.println("permission = " + permission); if (!permissionService.hasPermission(userId, permission)) { throw new Exception("用户无权访问: " + permission); } } } }注意：在 PermissionAspect 类中，去判断该用户是否拥有此权限。一般是根据用户的 id 传参，用户的id一般是在请求头中获取的，我这里为了方便，把用户的id写死为了 “1”。
@Service public class PermissionService { @Autowired private PermissionMapper permissionMapper; public boolean hasPermission(Long userId, String permissionName) { Set<String> userPermissions = permissionMapper.selectPermissionByUserId(userId); for (String permission : userPermissions) { if (permission.equals(permissionName)) { return true; } } return false; } }2、根据用户的id关联查询权限码
@Mapper public interface PermissionMapper { Set<String> selectPermissionByUserId(@Param("userId") Long userId); }XML语句
<?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.soft.mapper.PermissionMapper"> <select id="selectPermissionByUserId" resultType="java.lang.String" parameterType="map"> SELECT p.permission_name from users u left join user_role ur on u.id = ur.user_id left join roles r on ur.role_id = r.id left join role_permission rp on r.id = rp.role_id left join permissions p on rp.permission_id = p.id where u.id = #{userId} </select> </mapper>3、在controller层使用权限校验
@RestController public class PermissopnController { //@CheckPermission({"100001", "100002"}) @CheckPermission("100001") @GetMapping("/hello") public String test1(){ return "hello world permission"; } }注意：该权限码必须是该登录用户拥有的权限码，只有拥有权限码的用户才能访问该接口，如果是多个权限码，可以使用 {"权限码","权限码"} ，在这里多个权限码是并集。
