Springmvc mvc:exclude-mapping不拦截 无效

最近在使用ssm框架搭建一个后台，需要判断每个请求都判断是否登录，未登录跳转到登录页面，

使用发现 mvc:exclude-mapping 不拦截，发现，怎么都无效，依然是进行拦截。查了很多资料，总算解决了。

  <mvc:interceptors>  
        <mvc:interceptor>  
         <!--    需拦截的地址  
                        一级目录   -->
            <mvc:mapping path="/*.do" />  
            <mvc:mapping path="/*.ajax" />  
           <!--  <mvc:mapping path="/*.html" />   -->
  
                     <!--    二级目录   -->
            <mvc:mapping path="/*/*.do" />  
            <mvc:mapping path="/*/*.ajax" />  
         <!--    <mvc:mapping path="/*/*.html" />   -->
          <!--   需排除拦截的地址 -->
           <!--  <mvc:exclude-mapping path="/manager/login.do"/>   -->
           <!-- <mvc:exclude-mapping path="/myblog/login.do"/> 这种写法拦截不了--> 
            <mvc:exclude-mapping path="/login.do"/>
            <mvc:exclude-mapping path="/manager/login.html"/>
            <bean class="com.sun.common.base.SecurityInterceptor" />  
        </mvc:interceptor>  
    </mvc:interceptors>

原因是： 如果把项目的路径一起带上是拦截不了的。

  <mvc:exclude-mapping path="/myblog/login.do"/> 这种写法拦截不了

要写成这样才行：

<mvc:exclude-mapping path="/login.do"/>

 拦截器代码；

package com.sun.common.base;

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

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
/**
 * 拦截器，拦截未登录用户
 * @author Administrator
 *
 */
public class SecurityInterceptor implements HandlerInterceptor {

	private static final String LOGIN_URL = "/manager/login.html";  
	
	@Override
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		// TODO Auto-generated method stub

	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object arg2) throws Exception {
		// TODO Auto-generated method stub
		HttpSession session = req.getSession(true);  
		// 从session 里面获取用户名的信息  
        Object obj = session.getAttribute("loginUser");  
        System.err.println("-----------------------------------------进入拦截器---------------------------");
        // 判断如果没有取到用户信息，就跳转到登陆页面，提示用户进行登陆  
        if (obj == null || "".equals(obj.toString())) {  
        	resp.sendRedirect(LOGIN_URL); 
        	return false;
        } 
		return true;
	}

}