判断文件大小是否可上传

/*
* 判断文件大小是否可上传*/
public Boolean judgeFileSize(MultipartFile file) throws Exception {
   Boolean flag = true;
   CommonsMultipartFile cf = (CommonsMultipartFile) file;
   DiskFileItem fi = (DiskFileItem) cf.getFileItem();
   File f = fi.getStoreLocation();

   if (f.exists() && f.isFile()) {
      long fileS = f.length();
      DecimalFormat df = new DecimalFormat("#.00");
      if (fileS < 1073741824) {
         String size = df.format((double) fileS / 1048576); // + "MB"
         // Integer intSize = Integer;
         if (size != null) {
            Double intSize = Double.parseDouble(size.trim());//文件大小
            //获取配置文件中的文件最大限制
            Properties prop = new Properties();
            InputStream inputStream = DbFH.class.getClassLoader().getResourceAsStream("dbconfig.properties");
            prop.load(inputStream);
            inputStream.close();
            String str = prop.getProperty("FileMaxSize").trim();//文件限制大小
            if (intSize > Double.valueOf(str)) {  // 不能上传超过10M的文件!
               flag = false;
            }
         }
      }
   }
   return flag;
}