Example usage for java.nio ByteBuffer rewind

Introduction

In this page you can find the example usage for java.nio ByteBuffer rewind.

Prototype

public final Buffer rewind()

Source Link

Document

Rewinds this buffer.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    DatagramChannel server = null;
    server = DatagramChannel.open();
    InetSocketAddress sAddr = new InetSocketAddress("localhost", 8989);
    server.bind(sAddr);// w ww .  j a  va 2 s  . c o m
    ByteBuffer buffer = ByteBuffer.allocate(1024);

    while (true) {
        System.out.println("Waiting for a  message  from" + "  a  remote  host at " + sAddr);
        SocketAddress remoteAddr = server.receive(buffer);
        buffer.flip();
        int limits = buffer.limit();
        byte bytes[] = new byte[limits];
        buffer.get(bytes, 0, limits);
        String msg = new String(bytes);

        System.out.println("Client at " + remoteAddr + "  says: " + msg);
        buffer.rewind();
        server.send(buffer, remoteAddr);
        buffer.clear();
    }
    //server.close();
}

From source file:MainClass.java

public static void main(String[] argv) throws Exception {
    int port = 1234; // default

    ByteBuffer buffer = ByteBuffer.wrap(GREETING.getBytes());
    ServerSocketChannel ssc = ServerSocketChannel.open();

    ssc.socket().bind(new InetSocketAddress(port));
    ssc.configureBlocking(false);//from w  ww.  j  av a 2  s .c  o m

    while (true) {
        System.out.println("Waiting for connections");

        SocketChannel sc = ssc.accept();

        if (sc == null) {
            Thread.sleep(2000);
        } else {
            System.out.println("Incoming connection from: " + sc.socket().getRemoteSocketAddress());

            buffer.rewind();
            sc.write(buffer);
            sc.close();
        }
    }
}

From source file:Test.java

public static void main(String[] args) throws IOException {
    Path path = Paths.get("/users.txt");

    try (SeekableByteChannel sbc = Files.newByteChannel(path)) {
        ByteBuffer buffer = ByteBuffer.allocate(1024);

        sbc.position(4);//  w ww.j a va 2  s  .co m
        sbc.read(buffer);
        for (int i = 0; i < 5; i++) {
            System.out.print((char) buffer.get(i));
        }

        buffer.clear();
        sbc.position(0);
        sbc.read(buffer);
        for (int i = 0; i < 4; i++) {
            System.out.print((char) buffer.get(i));
        }
        sbc.position(0);
        buffer = ByteBuffer.allocate(1024);
        String encoding = System.getProperty("file.encoding");
        int numberOfBytesRead = sbc.read(buffer);
        System.out.println("Number of bytes read: " + numberOfBytesRead);
        while (numberOfBytesRead > 0) {
            buffer.rewind();
            System.out.print("[" + Charset.forName(encoding).decode(buffer) + "]");
            buffer.flip();
            numberOfBytesRead = sbc.read(buffer);
            System.out.println("\nNumber of bytes read: " + numberOfBytesRead);
        }

    }

}

From source file:Main.java

public static void print(ByteBuffer bb) {
    while (bb.hasRemaining())
        System.out.print(bb.get() + " ");
    System.out.println();/*from  w  w w.j  av  a 2s .  c om*/
    bb.rewind();
}

From source file:Main.java

public static ByteBuffer clone(ByteBuffer original) {
    ByteBuffer clone = ByteBuffer.allocate(original.capacity());
    original.rewind();//copy from the beginning
    clone.put(original);//w ww . ja va  2  s .com
    original.rewind();
    clone.flip();
    return clone;
}

From source file:Main.java

public static byte[] array(ByteBuffer byteBuffer) {
    ByteBuffer byteBuffer2 = byteBuffer.duplicate();
    byte[] arrby = new byte[byteBuffer2.limit()];
    byteBuffer2.rewind();
    byteBuffer2.get(arrby);//from   w  w w  . j a  v a  2 s.  c o  m
    return arrby;
}

From source file:Main.java

public static byte[] getBytes(Bitmap bitmap) {
    int byteCount = bitmap.getByteCount();
    ByteBuffer buffer = ByteBuffer.allocate(byteCount);
    bitmap.copyPixelsToBuffer(buffer);/* ww w  .j  av  a2  s.  c om*/
    buffer.rewind();

    byte[] data = new byte[byteCount];
    buffer.get(data);
    return data;
}

From source file:Main.java

public static ByteBuffer createByteBufferOnHeap(ByteBuffer buf, final int size) {
    if (buf != null && buf.limit() == size) {
        buf.rewind();
        return buf;
    }//from   w  w  w  . j  a  v  a2s.  c  o  m

    buf = createByteBufferOnHeap(size);
    return buf;
}

From source file:Main.java

/**
 * Converts bitmap to the byte array without compression
 * @param bitmap source bitmap/*w w w.  j  a  v  a 2 s.c  om*/
 * @return result byte array
 */
public static byte[] convertBitmapToByteArrayUncompressed(Bitmap bitmap) {
    ByteBuffer byteBuffer = ByteBuffer.allocate(bitmap.getByteCount());
    bitmap.copyPixelsToBuffer(byteBuffer);
    byteBuffer.rewind();
    return byteBuffer.array();
}

From source file:Main.java

public static ByteBuffer createByteBuffer(ByteBuffer buf, final int size) {
    if (buf != null && buf.limit() == size) {
        buf.rewind();
        return buf;
    }//ww w  .j a va2  s.c o m

    buf = createByteBuffer(size);
    return buf;
}