Java Utililty Methods File Write via ByteBuffer

List of utility methods to do File Write via ByteBuffer

  1. HOME
  2. Java
  3. F
  4. File Write via ByteBuffer

Description

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

Method

MappedByteBuffermmap(File file, long offset, long length, boolean writeable)
mmap 
FileChannel chan = channel(file, writeable);
FileChannel.MapMode mode = writeable ? FileChannel.MapMode.READ_WRITE : FileChannel.MapMode.READ_ONLY;
MappedByteBuffer buf = chan.map(mode, offset, length);
chan.close();
return buf;
ByteBuffernewWriteableBuffer(int capacity)
new Writeable Buffer 
ByteBuffer newBuffer = ByteBuffer.allocate(capacity);
return newBuffer;
voidwrite(File file, String content, String encoding)
write 
FileChannel channel = new FileOutputStream(file).getChannel();
try {
    channel.write(ByteBuffer.wrap(content.getBytes(encoding)));
} finally {
    channel.close();
voidwrite(InputStream source, File target)
Writes an InputStream to disk. 
RandomAccessFile file = new RandomAccessFile(target, "rw");
FileChannel channel = null;
FileLock lock = null;
try {
    channel = file.getChannel();
    lock = channel.lock();
    ByteBuffer buffer = ByteBuffer.allocate(1024);
    byte[] bytes = buffer.array();
...
voidwrite(Path file, String content)
write 
writeBytes(file, utf8(content));
voidwrite(SeekableByteChannel channel, long start, byte[] bytes)
write 
channel.position(start);
ByteBuffer buffer = ByteBuffer.wrap(bytes);
while (buffer.hasRemaining()) {
    channel.write(buffer);
byte[]write24BitInteger(int integer, ByteOrder order)
write Bit Integer 
ByteBuffer tmp = ByteBuffer.allocate(4);
tmp.order(order);
tmp.putInt(integer);
if (order == ByteOrder.BIG_ENDIAN) {
    return subArray(tmp.array(), 1, 4);
} else if (order == ByteOrder.LITTLE_ENDIAN) {
    return subArray(tmp.array(), 0, 3);
throw new UnsupportedOperationException("Unknown ByteOrder " + order);
voidwriteByte(WritableByteChannel channel, byte value)
write Byte 
channel.write((ByteBuffer) ByteBuffer.allocate(1).put(value).flip());
intwriteBytes(Path file, byte[] bytes)
Writes bytes to a path 
FileChannel channel = FileChannel.open(file, EnumSet.of(StandardOpenOption.CREATE,
        StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE));
ByteBuffer buffer = ByteBuffer.wrap(bytes);
channel.force(false);
int bytesWritten = channel.write(buffer);
channel.close();
return bytesWritten;
voidwriteComment(File zipFile, String comment)
write Comment 
byte[] data = comment.getBytes("utf-8");
final RandomAccessFile raf = new RandomAccessFile(zipFile, "rw");
raf.seek(zipFile.length() - 2);
writeShort(data.length + 2 + COMMENT_SIGN.length, raf);
writeBytes(data, raf);
writeShort(data.length, raf);
writeBytes(COMMENT_SIGN, raf);
raf.close();
...