springMVC中拦截器的配置

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本文基于springMVC框架，以自定义拦截器为例。
SpringMVC的拦截器HandlerInterceptorAdapter对应提供了三个preHandle，postHandle，afterCompletion方法。
preHandle在业务处理器处理请求之前被调用，
postHandle在业务处理器处理请求执行完成后,生成视图之前执行，
afterCompletion在DispatcherServlet完全处理完请求后被调用,可用于清理资源等。所以要想实现自己的权限管理逻辑，需要继承HandlerInterceptorAdapter并重写其三个方法。

springmvc.xml中配置

    <!-- 拦截所有springmvc的url！ -->    <mvc:interceptors>        <bean class="com.interceptor.SessionInterceptor"></bean>     </mvc:interceptors>

2 ，SessionInterceptor.java代码，我这里全部贴了。

package com.interceptor;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import com.entity.User;public class SessionInterceptor extends HandlerInterceptorAdapter {    private static final Map<Integer, User> userMap = new HashMap<Integer, User>();    @Override    public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception {        //注册，不拦截         if(request.getRequestURL().toString().endsWith("register.do")){             return true;         }    //不是登录请求，判断是否已经登录   if(!request.getRequestURL().toString().endsWith("login.do")){            User user = (User) request.getSession().getAttribute("user");             if(user!=null){                     Integer userId = user.getUserid();                    User mapUser = userMap.get(userId);                    if((request.getSession().getId() != mapUser.getSessionId())  &&  ( System.currentTimeMillis() - mapUser.getLoginTime() > 5000 ))                    {                        response.sendRedirect(request.getContextPath()+"/login.jsp");                        return false;                    }             }else{                 response.sendRedirect(request.getContextPath()+"/login.jsp");                    return false;             }        }        return true;    }    @Override    public void postHandle(HttpServletRequest request,HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {        if(request.getRequestURL().toString().endsWith("login.do"))        {            User user = (User)request.getSession().getAttribute("user");            if(null!=user){                User user1 = new User();                    user1.setSessionId(request.getSession().getId());                user1.setLoginTime(System.currentTimeMillis());                userMap.put(user.getUserid(), user1);            }        }    }}

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