SpingMVC拦截器

一个类实现了HandlerInterceptor就代表这个类就是一个拦截器了，创建了拦截器需要配置。 

package com.zhang;

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

public class inter implements HandlerInterceptor {


    public boolean preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler) throws Exception {
        if (request.getSession().getAttribute("user") == null) {
            return false;
        }
        return true;
    }

    public void postHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    public void afterCompletion(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

Spring配置