Java Size Format formatFilesize(long filesize)

Description

Formats filesize in bytes as appropriate to Bytes, KB, MB or GB

License

Open Source License

Parameter

Parameter	Description
filesize	in bytes

Return

formatted filesize

Declaration

public static String formatFilesize(long filesize) 

Method Source Code

//package com.java2s;
// it under the terms of the GNU General Public License as published by

import java.text.NumberFormat;

public class Main {
    /** static number format instance. Used to format filesizes. */
    private static NumberFormat numberFormat = NumberFormat.getInstance();

    /** Formats filesize in bytes as appropriate to Bytes, KB, MB or GB
     */*from   w ww.  j ava2 s. co m*/
     * @param filesize in bytes
     * @return formatted filesize
     **/
    public static String formatFilesize(long filesize) {
        String result;

        if (Math.abs(filesize) < 1024) {
            result = "" + filesize + " Bytes";
        } else if (Math.abs(filesize) < 1048576) {
            result = formatFilesizeKB(filesize, 2);
        } else if (Math.abs(filesize) < 1073741824) {
            result = formatFilesizeMB(filesize, 2);
        } else {
            result = formatFilesizeGB(filesize, 2);
        }

        return result;
    }

    /** Formats filesize in bytes to KB
     *
     * @param filesize in bytes
     * @param fractionDigits ...
     * @return formatted filesize
     */
    private static String formatFilesizeKB(long filesize, int fractionDigits) {
        numberFormat.setMaximumFractionDigits(fractionDigits);

        return new StringBuffer(numberFormat.format(filesize / 1024.0)).append(" KB").toString();
    }

    /** Formats filesize in bytes to KB
     *
     * @param filesize in bytes
     * @return formatted filesize
     */
    public static String formatFilesizeKB(long filesize) {
        return new StringBuffer().append(filesize / 1024).append(" KB").toString();
    }

    /** Formats filesize in bytes to MB
     *
     * @param filesize in bytes
     * @param fractionDigits ...
     * @return formatted filesize
     */
    private static String formatFilesizeMB(long filesize, int fractionDigits) {
        numberFormat.setMaximumFractionDigits(fractionDigits);

        // 1048576 = 1024.0 * 1024.0
        return new StringBuffer(numberFormat.format(filesize / 1048576.0)).append(" MB").toString();
    }

    /** Formats filesize in bytes to GB
     *
     * @param filesize in bytes
     * @param fractionDigits ...
     * @return formatted filesize
     */
    private static String formatFilesizeGB(long filesize, int fractionDigits) {
        numberFormat.setMaximumFractionDigits(fractionDigits);

        // 1048576 = 1024.0 * 1024.0
        return new StringBuffer(numberFormat.format(filesize / 1073741824.0)).append(" GB").toString();
    }
}

Related

1. formatFileSize(double fileSize, int precision, int unit, boolean showUnit)
2. formatFileSize(File file)
3. formatFilesize(final long filesize, final Locale locale)
4. formatFilesize(int s)
5. formatFileSize(long fileS)
6. formatFileSize(long fileSize, int decimalPos)
7. formatFileSize(long length)
8. formatFileSize(long size)
9. formatFileSize(long size)