Java File Size Readable Format formatByteSize(long bytes, int lastDigits)

Description

This methode formats the bytes in human readable form.

License

Apache License

Parameter

Parameter	Description
bytes	number of bytes
lastDigits	number of digits after the `.` point

Return

String representation of bytes

Declaration

public static String formatByteSize(long bytes, int lastDigits) 

Method Source Code

//package com.java2s;
/*/*w  w  w.j a  va  2  s. com*/
 * Created on 26.04.2005
 *
 * Copyright 2005-2006 Daniel Jacobi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

public class Main {
    /**
     * This methode formats the bytes in human readable form. With the
     * lastDigits you can specify the number of digits after the '.'. This is
     * turned off, if the value is less equal zero.
     * 
     * @param bytes
     *            number of bytes
     * @param lastDigits
     *            number of digits after the `.` point
     * @return String representation of bytes
     */
    public static String formatByteSize(long bytes, int lastDigits) {
        String formated = null;
        double work = bytes;
        long count = 0;

        // digits
        while (work >= 1024) {
            work /= 1024;
            count++;
        }
        formated = String.valueOf(work);

        // format last digits
        if (lastDigits > 0) {
            int pos = formated.lastIndexOf('.');
            if (formated.length() - pos - 1 < lastDigits) {
                for (int i = formated.length() - pos - 1; i < lastDigits; i++)
                    formated += "0";
            } else {
                formated = formated.substring(0, pos + lastDigits + 1);
            }
        }

        // unit
        if (count == 0) {
            formated += " B";
        } else if (count == 1) {
            formated += " kB";
        } else if (count == 2) {
            formated += " MB";
        } else if (count == 3) {
            formated += " GB";
        } else if (count == 4) {
            formated += " TB";
        } else if (count == 5) {
            formated += " PB";
        }

        return formated;
    }
}

Related

1. convertFileSize(double size, Locale locale)
2. convertFileSize(long size)
3. convertFileSize(long size)
4. formatarNumeroComZerosAEsquerda(long numero, int size)
5. formatByteSize(long bytes, int decimals)
6. formatByteSize(long byteSize)
7. formatByteSizeToString(long bytes)
8. formatDataSize(long size)
9. FormatDataSize(long uBytes)