Example usage for java.nio ByteBuffer allocateDirect

Introduction

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

Prototype

public static ByteBuffer allocateDirect(int capacity)

Source Link

Document

Creates a direct byte buffer based on a newly allocated memory block.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {

    byte[] bytes = new byte[10];
    ByteBuffer buf = ByteBuffer.allocateDirect(10);
    buf = ByteBuffer.wrap(bytes);

    System.out.println(Arrays.toString(buf.array()));
    System.out.println(buf.toString());
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();/*from w ww. j a va  2s  .  c  o m*/

        numRead = channel.read(buf);

        buf.rewind();

        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();//from ww w  .j av  a 2  s  .  c om

        numRead = channel.read(buf);

        buf.rewind();

        // Read bytes from ByteBuffer; see also
        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile.dat").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();//ww w . j a  v a2s.  c  o  m

        numRead = channel.read(buf);

        buf.rewind();

        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    SocketChannel sChannel = SocketChannel.open();
    sChannel.configureBlocking(false);/*from   w w w .  ja v  a 2 s  .  c  o m*/
    sChannel.connect(new InetSocketAddress("hostName", 12345));

    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    buf.put((byte) 0xFF);

    buf.flip();

    int numBytesWritten = sChannel.write(buf);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    File aFile = new File("primes.txt");
    FileInputStream inFile = new FileInputStream(aFile);
    FileChannel inChannel = inFile.getChannel();
    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    buf.position(buf.limit());/*ww w .  ja v  a2s.co m*/
    while (true) {
        if (buf.remaining() < 8) {
            if (inChannel.read(buf.compact()) == -1) {
                break;
            }
            buf.flip();
        }
        int strLength = (int) buf.getDouble();
        if (buf.remaining() < 2 * strLength) {
            if (inChannel.read(buf.compact()) == -1) {
                break;
            }
            buf.flip();
        }
        byte[] strChars = new byte[2 * strLength];
        buf.get(strChars);
        if (buf.remaining() < 8) {
            if (inChannel.read(buf.compact()) == -1) {
                break;
            }
            buf.flip();
        }
        System.out.println(strLength);
        System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
        System.out.println(buf.getLong());
    }
    inFile.close();
}

From source file:ExplicitChannelWrite.java

public static void main(String args[]) {
    FileOutputStream fOut;//from w ww . j a va  2 s . co  m
    FileChannel fChan;
    ByteBuffer mBuf;

    try {
        fOut = new FileOutputStream("test.txt");
        fChan = fOut.getChannel();
        mBuf = ByteBuffer.allocateDirect(26);
        for (int i = 0; i < 26; i++)
            mBuf.put((byte) ('A' + i));
        mBuf.rewind();
        fChan.write(mBuf);
        fChan.close();
        fOut.close();
    } catch (IOException exc) {
        System.out.println(exc);
        System.exit(1);
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Charset charset = Charset.forName("ISO-8859-1");
    CharsetDecoder decoder = charset.newDecoder();
    CharsetEncoder encoder = charset.newEncoder();
    ByteBuffer bbuf = ByteBuffer.allocateDirect(1024);

    CharBuffer cbuf = CharBuffer.allocate(1024);

    encoder.encode(cbuf, bbuf, false);/*from   ww w.  ja va 2  s  . co m*/

    bbuf.flip();

    decoder.decode(bbuf, cbuf, false);

    cbuf.flip();

}

From source file:Main.java

public static void main(String[] argv) throws Exception {

    ByteBuffer bbuf = ByteBuffer.wrap(new byte[10]);
    boolean isDirect = bbuf.isDirect(); // false

    bbuf = ByteBuffer.allocate(10);
    isDirect = bbuf.isDirect(); // false

    bbuf = ByteBuffer.allocateDirect(10);
    isDirect = bbuf.isDirect(); // true

}

From source file:Main.java

static public void main(String args[]) throws Exception {
    FileInputStream fin = new FileInputStream("infile.txt");
    FileOutputStream fout = new FileOutputStream("outfile.txt");

    FileChannel inc = fin.getChannel();
    FileChannel outc = fout.getChannel();

    ByteBuffer bb = ByteBuffer.allocateDirect(1024);

    while (true) {
        int ret = inc.read(bb);
        if (ret == -1)
            break;
        bb.flip();/*from  w w w.  ja  v a  2  s. c o m*/
        outc.write(bb);
        bb.clear();
    }
}