Java实现字节转换，可以自动转换为B、KB、MB、GB、TB

public static String readableFileSize(long size) {if (size <= 0) return "0";final String[] units = new String[]{"B", "KB", "MB", "GB", "TB"};int digitGroups = (int) (Math.log10(size) / Math.log10(1024));return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + units[digitGroups];}