一、首先写一个类实现HandlerInterceptor，

　　实现HandlerInterceptor中的方法。

　　将preHandler 的返回值写成true，若不该就不会执行后面请求的方法了。

package com.neuedu.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 Inteceptor1 implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)            throws Exception {        // TODO Auto-generated method stub        System.out.println("preHandle");        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,            ModelAndView modelAndView) throws Exception {        System.out.println("postHandle");            }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)            throws Exception {        System.out.println("afterCompletion");            }}

 

二、在SpringMVC的配置文件中，我的是SpringMVC.xml配置interceptor

　　使用<mvc>的标签

这样在请求后台的响应的时候就会经过拦截器，执行拦截器中的方法。