使用ssm框架实现文件上传时报错————（Failed to instantiate [org.springframework.web.multipart.MultipartFile]）

报错信息：
SEVERE: Servlet.service() for servlet [springDispatcherServlet] in context with path [/ssm01] threw exception 
[Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: 
Failed to instantiate [org.springframework.web.multipart.MultipartFile]: 
Specified class is an interface] with root cause

解决方法：
controller类中的上传文件方法未添加参数映射，加上@RequestParam("前台input表单文件name名")