springmvc中攔截器的定義和配置

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;

/**
 * 自定義攔截器
 *
 * @author newcityman
 * @date 2019/11/28 - 23:57
 */
public class MyInterceptor1 implements HandlerInterceptor {
 /**
 * 攔截器前處理方法
 *
 * @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執行了....前處理方法");
// request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
 return true;
 }

 /**
 * 攔截器后處理方法
 * @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執行了....后處理方法");
 request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
 }

 /**
 * success.jsp頁面執行后，該方法會執行
 * @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執行了....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掃描的包-->
 <context:component-scan base-package="com.hope"></context:component-scan>
 <!--視圖解析器-->
 <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
 <property name="prefix" value="/WEB-INF/pages/"/>
 <property name="suffix" value=".jsp"/>
 </bean>

 <!-- 配置文件解析器對象,處理文件上傳處理-->
 <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資源不攔截-->
 <!--前端控制器，哪些靜態資源不攔截-->
 <mvc:resources location="/css/" mapping="/css/**"/>
 <mvc:resources location="/images/" mapping="/images/**"/>
 <mvc:resources location="/js/" mapping="/js/**"/>

 <!--配置攔截器-->
 <mvc:interceptors>
 <!--配置攔截器-->
 <mvc:interceptor>
 <!--要攔截的具體的方法-->
 <mvc:mapping path="/user/*"/>
 <!--不要攔截的具體方法-->
 <!--<mvc:exclude-mapping path=""/>-->
 <!-- 配置攔截器對象-->
 <bean class="com.hope.interceptor.MyInterceptor1"></bean>
 </mvc:interceptor>
 </mvc:interceptors>
 <!--開啟springmvc框架注解的支持,包含開啟處理器映射器和處理器適配器-->
 <mvc:annotation-driven />
</beans>