SpringBoot拦截器中获取注解、拦截器中注入Service

拦截器中获取注解 来源：https://blog.csdn.net/wangmx1993328/article/details/81030268/

public class JWTInterceptor implements HandlerInterceptor {
    private SysSettingService sysSettingService;
    //构造函数传入Service
    public JWTInterceptor(SysSettingService _sysSettingService) {
        sysSettingService = _sysSettingService;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {
            //方法处理器, 请求的目标方法。RequirePermissions是自定义注解。
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            //1: 获取目标方法上的指定注解,不存在时,返回 Null
            RequirePermissions methodPermissions = handlerMethod.getMethodAnnotation(RequirePermissions.class);
            //2: 获取目标方法所在类上的指定主键,不存在时,返回 Null
            RequirePermissions classPermissions = handlerMethod.getMethod().getDeclaringClass().getAnnotation(RequirePermissions.class);
            if (methodPermissions != null) {
                //获取注解中的数据
                String[] permissions = methodPermissions.values();
            }
        }
    }
}