springmvc拦截器的配置、使用

springmvc拦截器的配置、使用：
1.自定义拦截器，实现HandlerInterceptor接口。

package com.bybo.aca.web.interceptor;

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

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

public class Login implements HandlerInterceptor {

    @Override
    public void afterCompletion(HttpServletRequest httpRequest,
            HttpServletResponse httpResponse, Object arg2, Exception arg3)
            throws Exception {
         
    }

    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
            Object arg2, ModelAndView arg3) throws Exception {
        

    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
            Object object) throws Exception {
        /*HttpServletRequest httpRequest = (HttpServletRequest) request;  
         HttpServletResponse httpResponse = (HttpServletResponse) response;*/
        String urlString = request.getRequestURI();
            
        ///olForum/forumList.html模拟登录页
        if(urlString.endsWith("forumList.html")){
            return true;
        }
        //请求的路径
        String contextPath=request.getContextPath();
       
        /*httpRequest.getRequestDispatcher("/olForum/forumList").forward(httpRequest, httpResponse);*/
        /*response.sendRedirect(contextPath+"/olForum/forumList.html");*/
        response.sendRedirect(contextPath + "/olForum/forumList.html?login=aaa");  
        return false;
        /*httpResponse.sendRedirect(httpRequest.getContextPath()+"/olForum/forumList.html");
        return;*/
        

    }

}

2：springmvc配置文件中配置：

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

    <!-- 扫描controller（controller层注入） -->
    <context:component-scan base-package="com.bybo.aca.web.controller"/>
  
<mvc:interceptors>  
   <!--  使用bean定义一个Interceptor，直接定义在mvc:interceptors根下面的Interceptor将拦截所有的请求   -->
    <!-- <bean class="com.bybo.aca.web.interceptor.Login"/> -->   
    <mvc:interceptor>  
        <!-- 进行拦截：/**表示拦截所有controller -->
        <mvc:mapping path="/**" />
    　　 <!-- 不进行拦截 -->
        <mvc:exclude-mapping path="/index.html"/>
       
        <bean class="com.bybo.aca.web.interceptor.Login"/>  
    </mvc:interceptor>  
</mvc:interceptors>     
    
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:prefix="/WEB-INF/views/" p:suffix=".jsp"/>
    
</beans>

来源：https://www.cnblogs.com/super-chao/p/6496428.html