public class MyMvcInterceptor implements HandlerInterceptor {

    //在client调用Controller之前执行（拦截request）
    //return true;执行Controller。return false;不执行Controller。
    @Override
    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {

    }
    //在Controller返回ModelAndView之前执行（拦截response）
    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
            throws Exception {

    }
    //运行完Controller方法之后执行
    @Override
    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {

        return false;
    }

}

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/**"/><!--表示拦截所有路径-->
　　　　　<!--<mvc:exclude-mapping path=""/>表示排除哪些路径-->

        <bean class="com.xxxx.MyMvcInterceptor"/>
    </mvc:interceptor>
</mvc:interceptors>