Spring中MultipartFile里的临时文件获取

对于某些缓存文件信息敏感，需反复擦除

 @PostMapping("upload")
    public Object up(HttpServletRequest request){
        Object obj = null;
        File file = null;
        try {
            MultipartHttpServletRequest request1 = (MultipartHttpServletRequest) request;
            MultipartFile multipartFile = request1.getFile("file");
            ApplicationPart part = (ApplicationPart)request1.getPart("file");
            Class Clazz = part.getClass();
            Field field;
            if ((field = getField(Clazz, "location")) != null){
                field.setAccessible(true);
                try {
                    obj = field.get(part);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
            file = (File) obj;

            if ((field = getField(Clazz, "fileItem")) != null){
                field.setAccessible(true);
                try {
                    obj = field.get(part);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
            file = (File) obj;

            DiskFileItem fileItem =(DiskFileItem)obj;

            log.info(fileItem.getStoreLocation().toString());
            log.info(obj.toString());
            log.info(file.getAbsolutePath());
            log.info(file.getName());
            log.info(file.getCanonicalPath());
        } catch (IOException e) {
            e.printStackTrace();
            return  file;
        } catch (ServletException e) {
            e.printStackTrace();
            return  file;
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return  file;
    }