springmvc中拦截器的定义和配置

package com.hope.interceptor;

import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * 自定义拦截器
 *
 * @author newcityman
 * @date 2019/11/28 - 23:57
 */
public class MyInterceptor1 implements HandlerInterceptor {
    /**
     * 拦截器前处理方法
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("MyInterceptor执行了....前处理方法");
//        request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
        return true;
    }

    /**
     * 拦截器后处理方法
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
        System.out.println("MyInterceptor执行了....后处理方法");
        request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
    }

    /**
     * success.jsp页面执行后，该方法会执行
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
        System.out.println("MyInterceptor执行了....最后");
    }
}

<?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"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

    <!--指定spring扫描的包-->
    <context:component-scan base-package="com.hope"></context:component-scan>
    <!--视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

   <!-- 配置文件解析器对象,处理文件上传处理-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485760"></property>
    </bean>
   <!-- 指定前端控制器哪些资源不拦截-->
    <!--前端控制器，哪些静态资源不拦截-->
    <mvc:resources location="/css/" mapping="/css/**"/>
    <mvc:resources location="/images/" mapping="/images/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/>

    <!--配置拦截器-->
    <mvc:interceptors>
        <!--配置拦截器-->
        <mvc:interceptor>
            <!--要拦截的具体的方法-->
            <mvc:mapping path="/user/*"/>
            <!--不要拦截的具体方法-->
            <!--<mvc:exclude-mapping path=""/>-->
           <!-- 配置拦截器对象-->
            <bean class="com.hope.interceptor.MyInterceptor1"></bean>
        </mvc:interceptor>
    </mvc:interceptors>
    <!--开启springmvc框架注解的支持,包含开启处理器映射器和处理器适配器-->
    <mvc:annotation-driven />
</beans>