Java Utililty Methods File Size Get

List of utility methods to do File Size Get

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Description

The list of methods to do File Size Get are organized into topic(s).

Method

longgetFileSizes(File f)
get File Sizes 
long s = 0;
if (f.exists()) {
    FileInputStream fis = null;
    fis = new FileInputStream(f);
    s = fis.available();
return s;
StringgetFileSizeString(File file, boolean si)
Get the formatted File size as a String
See http://stackoverflow.com/questions/3758606/ for more information on how to properly format the size 
if (!file.isDirectory()) {
    long bytes = file.length();
    int unit = si ? 1000 : 1024;
    if (bytes < unit)
        return bytes + " B";
    int exp = (int) (Math.log(bytes) / Math.log(unit));
    String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
...
StringgetFilesizeString(long size)
get Filesize String 
String tail = "";
if (1024 > size) {
    tail = "byte";
} else if (1048576 > size) {
    size = size / 1024;
    tail = "Kb";
} else if (1073741824 > size) {
    size = size / 1024;
...
StringgetFileSizeStringFor(File file)
Returns a string representation of a file size, such as "842 bytes", "1.43 KB" or "3.4 MB". 
return getFileSizeStringFor(file.length(), false);
StringgetFolderSize(File folder)
get Folder Size 
if (folder == null)
    return "";
if (folder.isDirectory()) {
    return getFilesSize(folder.listFiles());
} else {
    return "";
StringgetSize(long fileSize)
get Size 
String size = getSize(fileSize, 2);
return size;
StringgetSizeErrorMessage(String pattern, Long maxFileSize, Long fileSize, String fileName)
get Size Error Message 
return MessageFormat.format(pattern, getHumanReadableByteCount(maxFileSize, false),
        getHumanReadableByteCount(fileSize, false), fileName);
StringgetStringSizeLengthFile(long size)
get String Size Length File 
DecimalFormat df = new DecimalFormat("0.00");
float sizeKb = 1024.0f;
float sizeMo = sizeKb * sizeKb;
float sizeGo = sizeMo * sizeKb;
float sizeTerra = sizeGo * sizeKb;
if (size < sizeMo)
    return df.format(size / sizeKb) + " Kb";
else if (size < sizeGo)
...
StringhumanFileSize(Long longFileSize)
Converts the size of a file to a human-readable string, e.g. 
if (longFileSize < 0)
    return ("");
if (longFileSize < 512)
    return (longFileSize.toString());
double doubleBytes;
DecimalFormat outputFormat = new DecimalFormat("0.00");
StringBuffer outputStrBuf = new StringBuffer();
FieldPosition fieldPos = new FieldPosition(0);
...
StringhumanReadableFileSize(long size)
human Readable File Size 
if (size <= 0) {
    return "0";
final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" };
int magnitude = (int) (Math.log10(size) / Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, magnitude)) + " " + units[magnitude];