SpringAOP在登陆控制上的使用

@Aspect
@Component
public class UserLoginAOP {
    @Pointcut("execution(* com.shop.controller.user.*.*(..))")
    public void aspect() {
    }

    @Around("aspect()")
    public Object beforeExec(ProceedingJoinPoint joinPoint) throws Throwable {
        HttpSession session = (HttpSession) joinPoint.getArgs()[2];
        HttpServletResponse response = (HttpServletResponse) joinPoint
                .getArgs()[1];
        User user = (User) session.getAttribute("user");
        if (user == null) {
            response.sendRedirect("/shop/jsp/toUserLogin.do");
            return null;
        } else {
            return joinPoint.proceed();
        }
        // System.out.println("check user login status");
    }
}