/**
* 格式化文件大小
* 参考:https://stackoverflow.com/a/5599842/1253611
*
* @param size byte
* @return readable file size
*/
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];
}
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