Java Utililty Methods File to Byte Array

List of utility methods to do File to Byte Array

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Description

The list of methods to do File to Byte Array are organized into topic(s).

Method

byte[]fileToByteArray(File file)
Loads data from file and converts it to a byte array. 
byte[] result;
try (FileInputStream fileInputStream = new FileInputStream(file)) {
    result = new byte[(int) file.length()];
    fileInputStream.read(result);
return result;
byte[]fileToByteArray(File file)
Converts a file into an array of bytes. 
final byte[] data = new byte[Math.toIntExact(file.length())];
try (FileInputStream fis = new FileInputStream(file)) {
    fis.read(data);
return data;
byte[]FiletoByteArray(File file)
File to ByteArray 
try {
    FileInputStream fis = new FileInputStream(file);
    byte[] result = new byte[fis.available()];
    fis.read(result);
    fis.close();
    return result;
} catch (Exception e) {
    e.printStackTrace();
...
byte[]fileToByteArray(File file)
file To Byte Array 
byte[] byteArray = new byte[(int) file.length()];
InputStream fis = new FileInputStream(file);
fis.read(byteArray);
fis.close();
return byteArray;
byte[]fileToByteArray(File file)
Reads the contents of a file in to a byte array. 
long numOfBytes = file.length();
if (numOfBytes > Integer.MAX_VALUE) {
    throw new IOException("File is to large to be read in to a byte array");
byte[] bytes = new byte[(int) numOfBytes];
FileInputStream ins = new FileInputStream(file);
int offset = 0;
int numRead = 0;
...
byte[]fileToByteArray(final File f)
file To Byte Array 
final FileInputStream is = new FileInputStream(f);
final byte[] ret = new byte[(int) f.length()];
int p = 0;
while (p < ret.length)
    p += is.read(ret, p, ret.length - p);
is.close();
return ret;
byte[]fileToByteArray(final IFile file)
file To Byte Array 
InputStream contents = null;
try {
    contents = file.getContents();
    return ByteStreams.toByteArray(contents);
} finally {
    if (contents != null)
        contents.close();
byte[]fileToByteArray(String filePath)
Method for converting a file (represented by its path) in an array of bytes 
if (COMPILE_FOR_JAVA) {
    File file = new File(filePath);
    byte[] bytes = null;
    try {
        FileInputStream fis = new FileInputStream(file);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        byte[] buf = new byte[1024];
        try {
...
byte[]fileToByteArray(String fname)
file To Byte Array 
File file = new File(fname);
FileInputStream fis = null;
try {
    fis = new FileInputStream(fname);
} catch (FileNotFoundException e) {
    return null;
byte[] fileContents = new byte[(int) file.length()];
...
byte[]fileToByteArray(String path)
Returns the file at the specified path as a byte array. 
File file = new File(path);
if (!file.exists() || file.isDirectory()) {
    return null;
FileInputStream in = null;
try {
    byte[] array = new byte[(int) file.length()];
    in = new FileInputStream(file);
...