Spring拦截器

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1.拦截器原理同filter类似？

2.拦截器的实现？

1）首先定义一个类，该类需要继承自HandlerInterceptor接口。

package com.gxa.bj.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class UserInterceptor implements HandlerInterceptor{@Overridepublic void afterCompletion(HttpServletRequest arg0,HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {// TODO Auto-generated method stub}@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,Object arg2, ModelAndView arg3) throws Exception {// TODO Auto-generated method stub}@Overridepublic boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,Object arg2) throws Exception {HttpSession session=arg0.getSession();if(session.getAttribute("userInfo")==null){arg0.getRequestDispatcher("../login.jsp").forward(arg0, arg1);return false;}else{return true;}}}

2）配置拦截器：在springmvc.xml中配置：特别需要注意在springmvc的声明里需要更改，更改之后的配置信息如下：

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="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-3.0.xsd"        default-autowire="byName"        >

3）编写相应的拦截器的拦截路径，在springmvc.xml中配置如下：

<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  --><mvc:interceptor>    <span style="color:#ffcc66;"><mvc:mapping path="/admin/*.action"/>  </span>    <bean class="com.gxa.bj.interceptor.UserInterceptor">    </bean></mvc:interceptor></mvc:interceptors>

注意：黄色的这部分的路径配置，表示的是拦截器拦截的是这个路径下的。*表示任意的。

4）示例，比如现在做一个AdminUser的控制器，需要由拦截器来拦截该控制器。

@Controller@RequestMapping(value="/admin")public class AdminUserAction {   @RequestMapping(value="/user.action")   public void user(){   System.out.println("请求过来了");   }   @RequestMapping(value="/delete.action")   public void delete(){   System.out.println("删除的请求");   }}

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