HttpServletRequest 轉換成MultipartHttpServletRequest

//轉換 HttpServletRequest
MultipartHttpServletRequest mulReq=(MultipartHttpServletRequest)request;
//獲取上傳的文件
CommonsMultipartFile file = (CommonsMultipartFile) mulReq.getFile("imageFile");
// 獲取文件名稱
String realFileName = file.getOriginalFilename();
System.out.println("文件名：" + realFileName);
//轉換為 file
DiskFileItem fi = (DiskFileItem)file.getFileItem(); 
File files = fi.getStoreLocation();