Java Utililty Methods Convert via ByteBuffer

List of utility methods to do Convert via ByteBuffer

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Description

The list of methods to do Convert via ByteBuffer are organized into topic(s).

Method

byte[]toByteArray(int[] intArray)
Returns a new byte array using data from the given integer array. 
ByteBuffer byteBuffer = ByteBuffer.allocate(intArray.length * 4);
byteBuffer.asIntBuffer().put(intArray);
return byteBuffer.array();
byte[]toByteArray(long[] data)
to Byte Array 
ByteBuffer byteBuffer = ByteBuffer.allocate(data.length * 8);
LongBuffer longBuffer = byteBuffer.asLongBuffer();
longBuffer.put(data);
return byteBuffer.array();
byte[]ToByteArray(long[] data)
To Byte Array 
List<Byte> result = new ArrayList<Byte>();
for (int i = 0; i < data.length; i++) {
    byte[] bs = long2bytes(data[i]);
    for (int j = 0; j < 8; j++) {
        result.add(bs[j]);
while (result.get(result.size() - 1) == SPECIAL_CHAR) {
...
byte[]toByteArray(ReadableByteChannel channel)
to Byte Array 
final ByteArrayOutputStream out = new ByteArrayOutputStream();
copy(channel, Channels.newChannel(out));
return out.toByteArray();
byte[]toByteArray(String bits)
to Byte Array 
int byteLength = bits.length() / 8;
if (bits.length() % 8 != 0) {
    byteLength += 1;
byte[] bytes = new byte[byteLength];
for (int i = 0; i < bits.length(); i++) {
    setBit(bytes, i, (byte) (bits.charAt(i) == '1' ? 1 : 0));
return bytes;
byte[]ToByteArray(String hexString)
To Byte Array 
final String[] hexChunks = hexString.replace(" ", "").split("(?<=\\G..)");
byte[] result = new byte[hexChunks.length];
for (int i = 0; i < hexChunks.length; i++) {
    result[i] = (byte) Integer.parseInt(hexChunks[i], 16);
return result;
byte[]toByteArray(String value)
Encodes the given string in UTF-8. 
if (value == null) {
    return null;
try {
    CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder()
            .onMalformedInput(CodingErrorAction.REPORT).onUnmappableCharacter(CodingErrorAction.REPORT);
    ByteBuffer buf = encoder.encode(CharBuffer.wrap(value));
    byte[] res = new byte[buf.remaining()];
...
byte[]toByteArray(UUID uniqueId)
to Byte Array 
byte[] bytes = new byte[(Long.SIZE / Byte.SIZE) * 2];
LongBuffer longBuffer = ByteBuffer.wrap(bytes).asLongBuffer();
longBuffer.put(new long[] { uniqueId.getMostSignificantBits(), uniqueId.getLeastSignificantBits() });
return bytes;
byte[]toByteArray2(String filename)
NIO way 
File f = new File(filename);
if (!f.exists()) {
    throw new FileNotFoundException(filename);
FileChannel channel = null;
FileInputStream fs = null;
try {
    fs = new FileInputStream(f);
...
byte[]toByteArray3(String filename)
to Byte Array 
FileChannel fc = null;
try {
    fc = new RandomAccessFile(filename, "r").getChannel();
    MappedByteBuffer byteBuffer = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size()).load();
    System.out.println(byteBuffer.isLoaded());
    byte[] result = new byte[(int) fc.size()];
    if (byteBuffer.remaining() > 0) {
        byteBuffer.get(result, 0, byteBuffer.remaining());
...