切面编程

@Component
@Aspect
public class powerCheckAspect {

    @Pointcut("@annotation(Power)")
    public void pointCut() {
    }

    @Around(value = "pointCut() && @annotation(power)", argNames = "power")
    public Object doAround(ProceedingJoinPoint pjp, Power power) throws Throwable {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
        HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getResponse();
        Employee user = (Employee) request.getSession().getAttribute("user");
        if (user == null) {
//            response.sendRedirect("login.html");
            return new JsonResult(506, "请先登录");
            //todo:login
        } else if (user.getPower() == null) {
            return new JsonResult(500, "权限设置错误");
        } else if ((power.value().getValue() & user.getPower()) >= power.value().getValue() || user.getPower() >= 0b100000) {
            return pjp.proceed();
        } else
            return new JsonResult(504, "缺少权限");
    }
}


// 销售退货
@Power(PowerType.xsth)
@PostMapping("/xsth/{order_total}/total")
public JsonResult xiaoShouTuiHuo(@RequestBody List<Cgdetail> detail_list, @PathVariable int order_total) {

    System.out.println(detail_list);
    return cgdetailService.AddDetailAndOrder(detail_list, order_total, true);
}


@Documented
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Power {
    PowerType value();
}

public enum PowerType {
    admin(0b10_0000),
    user(0b01_0000),
    cg(0b00_1000),
    cgth(0b00_0100),
    xs(0b00_0010),
    xsth(0b00_0001);

    private final short value;

    PowerType(int value) {
        this.value = (short) value;
    }

    public short getValue() {
        return value;
    }

}

/*
	 * 前置通知 --目标方法之前执行
	 * 后置通知 --目标方法之后执行（如果方法发生异常，不会执行）
	 * 环绕通知--在目标方法之前和之后执行
	 * 异常拦截通知--如果发生异常，就会调用
	 * 后置通知--目标方法之后执行（如果，目标方法发生异常，还会执行）
	 */