SpringMVC-文件上传、下载及静态资源处理

<!-- 防止资源文件被spring MVC拦截-->

<mvc:resources mapping="/images/**" location="/images/" cache-period="31556926"/>  
 <mvc:resources mapping="/js/**" location="/js/" cache-period="31556926"/>  
 <mvc:resources mapping="/css/**" location="/css/" cache-period="31556926"/>