springMvc 拦截器实现

package com.login;

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

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

public class Login implements HandlerInterceptor{


    /**
     * 在controller执行之后的DispatcherServlet之后执行
     * */
    @Override
    public void afterCompletion(HttpServletRequest httpRequest,
                                HttpServletResponse httpResponse, Object arg2, Exception arg3)
            throws Exception {
        System.out.println("在controller执行之后的DispatcherServlet之后执行");
    }

    /**
     * 在controller执行之后的DispatcherServlet之后执行
     * */
    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
                           Object arg2, ModelAndView arg3) throws Exception {
        System.out.println("在controller执行之后的DispatcherServlet之后执行");

    }

    /**
     * 在DispatcherServlet之前执行
     * */
    @Override
    public boolean  preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object object) throws Exception {

           // System.out.println("在DispatcherServlet之前执行");
           // return true;


       // response.sendRedirect("/olForum/forumList.html?login=aaa");
        response.sendRedirect("/login/index");
        return false;

    }

}

<!--拦截器-->
 <mvc:interceptors>
       <!--使用 bean 定义一个 Interceptor，直接定义在 mvc:interceptors 下面的 Interceptor 将拦截所有的请求-->
       <!--<bean class="com.login.Login"/>-->
        <mvc:interceptor>
            <mvc:mapping path="/*/*"/>
            <!--不拦截的请求-->
            <mvc:exclude-mapping path="/login/index"/>
        <!-- 定义在 mvc:interceptor 下面的 Interceptor，表示对特定的请求进行拦截-->
            <bean class="com.login.Login"/>
        </mvc:interceptor>
    </mvc:interceptors>