Convert a byte count into a human readable, rounded String using kB, MB, etc. This is base-1000 and not base-1024.

readableSize.java

/**
 * Convert a byte count into a human readable, rounded String using kB, MB,
 * etc. This is base-1000 and not base-1024.
 *
 * @param size number of bytes
 * @return formatted String
 */
private static String readableSize(long size) {
    if (size <= 0) {
        return "0 B";
    }
    final String[] units = new String[] { "B", "kB", "MB", "GB", "TB", "EB" };
    int digitGroups = (int) (Math.log10(size)/3);
    return new DecimalFormat("#,##0.#").format(size/Math.pow(1000, digitGroups))
            + " " + units[digitGroups];
}