Java determines the upload file size, MultipartFile, File

Reference materials:

Body:

    /**
           * Determine the file size
     *
     * @param len
           * File length
     * @param size
           * Restricted size
     * @param unit
           * Restricted units (B, K, M, G)
     * @return
     */
    public static boolean checkFileSize(Long len, int size, String unit) {
//        long len = file.length();
        double fileSize = 0;
        if ("B".equals(unit.toUpperCase())) {
            fileSize = (double) len;
        } else if ("K".equals(unit.toUpperCase())) {
            fileSize = (double) len / 1024;
        } else if ("M".equals(unit.toUpperCase())) {
            fileSize = (double) len / 1048576;
        } else if ("G".equals(unit.toUpperCase())) {
            fileSize = (double) len / 1073741824;
        }
        if (fileSize > size) {
            return false;
        }
        return true;
    }

Quote:

Returns: boolean (boolean)

// Upload file format
MultipartFile multipartFile = null;
 // file is no larger than 100M
FileUtil.checkFileSize( multipartFile.getSize(),100,"M");

 // Upload file format
File file = null;
 // file is no larger than 100M
FileUtil.checkFileSize( file.length(),100,"M")

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