[文件大小转换byte to kb, mb, gb, pb, eb, zb ] #Java

byte2HumanReadableSize.java

public static strictfp String humanReadableByteCount(long bytes, boolean si) {
    int unit = si ? 1000 : 1024;
    long absBytes = bytes == Long.MIN_VALUE ? Long.MAX_VALUE : Math.abs(bytes);
    if (absBytes < unit) return bytes + " B";
    int exp = (int) (Math.log(absBytes) / Math.log(unit));
    long th = (long) (Math.pow(unit, exp) * (unit - 0.05));
    if (exp < 6 && absBytes >= th - ((th & 0xfff) == 0xd00 ? 52 : 0)) exp++;
    String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
    if (exp > 4) {
        bytes /= unit;
        exp -= 1;
    }
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}