Example usage for java.nio ByteBuffer getLong

Introduction

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

Prototype

public abstract long getLong();

Source Link

Document

Returns the long at the current position and increases the position by 8.

Usage

From source file:Main.java

public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.allocate(BSIZE);
    bb.asLongBuffer().put(99472342341142L);
    System.out.println(bb.getLong());

}

From source file:Main.java

public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.allocate(BSIZE);
    bb.asLongBuffer().put(99472342341142L);
    bb.rewind();//from   ww  w.  ja  v  a  2s . co m
    System.out.println(bb.getLong());

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ByteBuffer buf = ByteBuffer.allocate(100);

    // Put values of different types
    buf.putLong(123L);//from   w  ww  .  ja  va2s .  c o  m

    // Reset position for reading
    buf.flip();

    // Retrieve the values
    long l = buf.getLong();

}

From source file:Main.java

public static void main(String[] args) {
    ByteBuffer bb = ByteBuffer.allocate(BSIZE);
    bb.asIntBuffer().put(99471142);/*from  ww w .ja v  a 2  s  .  c om*/
    System.out.println(bb.getInt());

    bb = ByteBuffer.allocate(BSIZE);
    bb.asLongBuffer().put(99472342341142L);
    System.out.println(bb.getLong());

    bb = ByteBuffer.allocate(BSIZE);

    bb.asFloatBuffer().put(99471142);
    System.out.println(bb.getFloat());

    bb = ByteBuffer.allocate(BSIZE);

    bb.asDoubleBuffer().put(99471142);
    System.out.println(bb.getDouble());

}

From source file:Main.java

public static void main(String[] args) throws Exception {
    File aFile = new File("main.java");
    FileInputStream inFile = new FileInputStream(aFile);
    FileChannel inChannel = inFile.getChannel();
    ByteBuffer lengthBuf = ByteBuffer.allocate(8);
    while (true) {
        if (inChannel.read(lengthBuf) == -1) {
            break;
        }//from w  w w  . j a  v  a 2 s .c  o m
        lengthBuf.flip();
        int strLength = (int) lengthBuf.getDouble();
        ByteBuffer buf = ByteBuffer.allocate(2 * strLength + 8);
        if (inChannel.read(buf) == -1) {
            break;
        }
        buf.flip();
        byte[] strChars = new byte[2 * strLength];
        buf.get(strChars);
        System.out.println(strLength);
        System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
        System.out.println(buf.getLong());
        lengthBuf.clear();
    }
    inFile.close();
}

From source file:MainClass.java

public static void main(String[] argv) throws Exception {
    ByteBuffer bb = ByteBuffer.allocate(20);

    bb.put((byte) 0x07);
    bb.put((byte) 0x08);
    bb.put((byte) 0x09);
    bb.put((byte) 0x10);
    bb.put((byte) 0x11);
    bb.put((byte) 0x12);
    bb.put((byte) 0x13);
    bb.put((byte) 0x14);

    bb.position(1).limit(5);//  www. j a v a  2s. com
    bb.mark();

    System.out.println("Expect an exception here");
    System.out.println("" + bb.order().toString() + ": " + bb.getLong());

}

From source file:MainClass.java

public static void main(String[] args) {
    File aFile = new File("primes.txt");
    FileInputStream inFile = null;
    try {//from w  w w  .  j a  va  2s  .c  o  m
        inFile = new FileInputStream(aFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel inChannel = inFile.getChannel();
    try {
        ByteBuffer lengthBuf = ByteBuffer.allocate(8);
        while (true) {
            if (inChannel.read(lengthBuf) == -1) {
                break;
            }
            lengthBuf.flip();
            int strLength = (int) lengthBuf.getDouble();
            ByteBuffer buf = ByteBuffer.allocate(2 * strLength + 8);
            if (inChannel.read(buf) == -1) {
                break;
            }
            buf.flip();
            byte[] strChars = new byte[2 * strLength];
            buf.get(strChars);
            System.out.println(strLength);
            System.out.println(ByteBuffer.wrap(strChars).asCharBuffer());
            System.out.println(buf.getLong());
            lengthBuf.clear();
        }
        inFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

From source file:MainClass.java

public static void main(String[] args) throws IOException {

    DatagramChannel channel = DatagramChannel.open();
    SocketAddress address = new InetSocketAddress(0);
    DatagramSocket socket = channel.socket();
    socket.bind(address);//ww  w  . j  a  v a2s  .com

    SocketAddress server = new InetSocketAddress("time-a.nist.gov", 37);
    channel.connect(server);

    ByteBuffer buffer = ByteBuffer.allocate(8);
    buffer.order(ByteOrder.BIG_ENDIAN);
    // send a byte of data to the server
    buffer.put((byte) 0);
    buffer.flip();
    channel.write(buffer);

    // get the buffer ready to receive data
    buffer.clear();
    // fill the first four bytes with zeros
    buffer.putInt(0);
    channel.read(buffer);
    buffer.flip();

    // convert seconds since 1900 to a java.util.Date
    long secondsSince1900 = buffer.getLong();
    long differenceBetweenEpochs = 2208988800L;
    long secondsSince1970 = secondsSince1900 - differenceBetweenEpochs;
    long msSince1970 = secondsSince1970 * 1000;
    Date time = new Date(msSince1970);

    System.out.println(time);
}

From source file:UDPTimeClient.java

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

    DatagramChannel channel = DatagramChannel.open();
    // port 0 selects any available port
    SocketAddress address = new InetSocketAddress(0);
    DatagramSocket socket = channel.socket();
    socket.setSoTimeout(5000);/*  ww  w .  j av  a  2 s .  c  o m*/
    socket.bind(address);

    SocketAddress server = new InetSocketAddress("time.nist.gov", 37);
    ByteBuffer buffer = ByteBuffer.allocate(8192);
    // time protocol always uses big-endian order
    buffer.order(ByteOrder.BIG_ENDIAN);
    // Must put at least one byte of data in the buffer;
    // it doesn't matter what it is.
    buffer.put((byte) 65);
    buffer.flip();

    channel.send(buffer, server);

    buffer.clear();
    buffer.put((byte) 0).put((byte) 0).put((byte) 0).put((byte) 0);
    channel.receive(buffer);
    buffer.flip();
    long secondsSince1970 = buffer.getLong();

    System.out.println(secondsSince1970);
    channel.close();

}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    createFile();// ww  w.  ja v a  2 s .c  o m

    File aFile = new File("C:/primes.bin");
    FileInputStream inFile = new FileInputStream(aFile);

    FileChannel inChannel = inFile.getChannel();

    final int PRIMESREQUIRED = 10;
    ByteBuffer buf = ByteBuffer.allocate(8 * PRIMESREQUIRED);

    long[] primes = new long[PRIMESREQUIRED];
    int index = 0; // Position for a prime in the file

    // Count of primes in the file
    final int PRIMECOUNT = (int) inChannel.size() / 8;

    // Read the number of random primes required
    for (int i = 0; i < PRIMESREQUIRED; i++) {
        index = 8 * (int) (PRIMECOUNT * Math.random());
        inChannel.read(buf, index); // Read the value
        buf.flip();
        primes[i] = buf.getLong(); // Save it in the array
        buf.clear();
    }

    for (long prime : primes) {
        System.out.printf("%12d", prime);
    }
    inFile.close(); // Close the file and the channel

}