实现一个权限验证拦截器。

1、修改web.xml文件中请求路径

 2、将所有的页面放入WEB-INF目录下

 3、开发登录FirstController

4、开发拦截器

5、配置springmvc.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!--2.配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!--3.开启注解驱动-->
    <mvc:annotation-driven />

    <!--4.组件扫描器-->
    <context:component-scan base-package="com.ambow.controller" />

    <!--配置拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <mvc:exclude-mapping path="/login"/>
            <bean class="com.ambow.LoginInterceptor" />
        </mvc:interceptor>
    </mvc:interceptors>
</beans>

6、运行程序：