Java File Size Readable Format formatFilesize(String filesize, int decimalPlaces)

Description

Formats a file size string if it is a numeric representation stored in bytes.

License

Apache License

Parameter

Parameter	Description
filesize	a parameter
decimalPlaces	a parameter

Declaration

public static String formatFilesize(String filesize, int decimalPlaces) 

Method Source Code

//package com.java2s;
/**/*  w ww . j  av  a2  s  .co  m*/
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 {
    private static String[] filesizeSuffixes = { "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

    /**
     * Formats a file size string if it is a numeric representation stored in bytes.  If there 
     * are non-numeric characters in the file size, then the filesize is returned.  Numeric file sizes
     * are labeled with the highest applicable unit which returns a whole number, plus decimalPlaces 
     * number of digits after the decimal.  If the value after the decimal would be 0, then no decimal
     * point is returned. 
     * @param filesize
     * @param decimalPlaces
     * @return
     */
    public static String formatFilesize(String filesize, int decimalPlaces) {
        try {
            int multipleCount = 0;
            long filesizeValue = Long.parseLong(filesize);
            long filesizeRemainder = 0;
            while (filesizeValue > 1024 && multipleCount < filesizeSuffixes.length) {
                filesizeRemainder = filesizeValue % 1024;
                filesizeValue /= 1024;
                multipleCount++;
            }
            StringBuilder filesizeBuilder = new StringBuilder();
            filesizeBuilder.append(filesizeValue);
            if (filesizeRemainder > 0 && decimalPlaces > 0) {
                int decimalMultiplier = 1;
                for (int i = 0; i < decimalPlaces; i++) {
                    decimalMultiplier *= 10;
                }
                filesizeRemainder = (filesizeRemainder * decimalMultiplier) / 1024;
                if (filesizeRemainder > 0)
                    filesizeBuilder.append(".").append(filesizeRemainder);
            }

            filesizeBuilder.append(" ");
            if (multipleCount < filesizeSuffixes.length)
                filesizeBuilder.append(filesizeSuffixes[multipleCount]);
            else
                filesizeBuilder.append(filesizeSuffixes[filesizeSuffixes.length - 1]);
            return filesizeBuilder.toString();
        } catch (NumberFormatException e) {
        }
        return filesize;
    }
}

Related

1. formatFileSize(long fileSizeLong)
2. formatFileSize(long size)
3. formatFileSize(long size)
4. formatFileSize(long size, String format)
5. FormatFileSize(String filesize)
6. formatFileStats(final String label, final long fileCount, final Object rawSize)
7. formatGroup(String str, int groupSize, int lineBreak)
8. formatIndex(int index, int totalSize)
9. formatInt(int val, int size)