拦截器为什么对main.jsp页面不进行拦截呢？

package com.imooc.restful.controller;

import com.imooc.restful.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpSession;

@Controller
public class UserController {
    @PostMapping("/login")
    public ModelAndView login(User user , HttpSession session){
        ModelAndView mav = null;
        System.out.println(user);
        if (user.getName().equals("admin") && user.getPassword().equals("admin")){
            mav = new ModelAndView("/main.jsp");
            session.setAttribute("user" , user);
            System.out.println("user已保存至session,user=" + (User)session.getAttribute("user"));
            mav.addObject("u" , user);
            return mav;
        }else {
            mav = new ModelAndView("/login.jsp");
            mav.addObject("msg" , "用户名或密码错误,请重新登陆");
            return mav;
        }
    }
}

package com.imooc.restful.inteceptor;

import com.imooc.restful.entity.User;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        User user = (User) request.getSession().getAttribute("user");
        System.out.println("拦截器启动,user=" + user);
        if (user != null){
            System.out.println("拦截器放行");
            return true;
        }else {
            System.out.println("拦截器拦截");
            response.sendRedirect("/login.jsp");
            return false;
        }
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mv="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <context:component-scan base-package="com.imooc.restful"/>
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven/>
    
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <mvc:exclude-mapping path="/login.jsp"/>
            <mvc:exclude-mapping path="/login**"/>
            <bean class="com.imooc.restful.inteceptor.LoginInterceptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors>
</beans>