格式化文件大小

FileUtils.java

/**
     * 文件大小格式转换
     * @param fileS 文件大小
     * @return 文件大小
     */
    public static String FormatFileSize(long fileS)
    {
        // 转换文件大小
        DecimalFormat df = new DecimalFormat("#.00");
        String fileSizeString = "";
        if (fileS < 1024)
        {
            fileSizeString = df.format((double) fileS) + "B";
        }
        else if (fileS < 1048576)
        {
            fileSizeString = df.format((double) fileS / 1024) + "KB";
        }
        else if (fileS < 1073741824)
        {
            fileSizeString = df.format((double) fileS / 1048576) + "MB";
        }
        else
        {
            fileSizeString = df.format((double) fileS / 1073741824) + "GB";
        }
        return fileSizeString;
    }