springmvc 登录检验

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首先interceptor这种方法只能拦截.do后缀的，因为springmvc 的servlet在配置中只拦截.do后缀的，而springmvc的interceptor配置在springmvc中

1 在springmvc.xml中配置

 <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/buyer/buyCart.do"/> 
            <mvc:mapping path="/buyer/showAllCollectionProducts.do"/>            
           <mvc:mapping path="/buyer/collectProductById.do"/>
            <bean class="com.ssh.interceptor.BuyerInterceptor"/>    
        </mvc:interceptor>

这种方式之拦截三个do
还有一种
排除法，看哪个方便

 <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.do"/>

        <bean class="com.bybo.aca.web.interceptor.Login"/>  
    </mvc:interceptor>  
</mvc:interceptors>    

2对配置的哪个bean进行编写

package com.ssh.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.ssh.po.Buyer;

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

public class BuyerInterceptor implements HandlerInterceptor {


     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            HttpSession session = request.getSession();
            Buyer buyer = (Buyer)session.getAttribute("buyer");
            if( buyer == null ){
                System.out.println("买家需要登录");
                request.getRequestDispatcher("/views/login.jsp").forward(request, response);
                return false;
            }

            return true;
        }

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

        }

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

        }
}