springMVC获取file，几种转换

//从前台通过name值获取file

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request;
MultipartFile multipartFile = multipartRequest.getFile("file");

//multipartFile转换成file
CommonsMultipartFile cf= (CommonsMultipartFile)multipartFile;
DiskFileItem fi = (DiskFileItem)cf.getFileItem();
File f = fi.getStoreLocation();