Example usage for java.nio ByteBuffer flip

Introduction

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

Prototype

public final Buffer flip() 

Source Link

Document

Flips this buffer.

Usage

From source file:MainClass.java

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

    FileInputStream inFile = new FileInputStream(args[0]);
    FileOutputStream outFile = new FileOutputStream(args[1]);

    FileChannel inChannel = inFile.getChannel();
    FileChannel outChannel = outFile.getChannel();

    ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);
    int bytesRead = 0;
    while (bytesRead >= 0 || buffer.hasRemaining()) {
        if (bytesRead != -1)
            bytesRead = inChannel.read(buffer);
        buffer.flip();
        outChannel.write(buffer);/* ww  w .j  ava2 s  .  c  o  m*/
        buffer.compact();
    }

    inChannel.close();
    outChannel.close();
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    DatagramChannel client = null;
    client = DatagramChannel.open();

    client.bind(null);//from ww  w .j  av a 2  s .  com

    String msg = "Hello";
    ByteBuffer buffer = ByteBuffer.wrap(msg.getBytes());
    InetSocketAddress serverAddress = new InetSocketAddress("localhost", 8989);

    client.send(buffer, serverAddress);
    buffer.clear();
    client.receive(buffer);
    buffer.flip();
    int limits = buffer.limit();
    byte bytes[] = new byte[limits];
    buffer.get(bytes, 0, limits);
    String response = new String(bytes);
    System.out.println("Server  responded: " + response);
    client.close();
}

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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);//from ww  w  .  j  a v  a2s.  c om
    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();
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    FileChannel fc = new FileOutputStream("data2.txt").getChannel();
    ByteBuffer buff = ByteBuffer.allocate(24); // More than needed
    buff.asCharBuffer().put("Some text");
    fc.write(buff);//from  w w w .java 2s.  c o m
    fc.close();

    fc = new FileInputStream("data2.txt").getChannel();
    buff.clear();
    fc.read(buff);
    buff.flip();
    System.out.println(buff.asCharBuffer());

}

---

From source file:MainClass.java

public static void main(String[] args) {
    File aFile = new File("data.dat");
    FileInputStream inFile = null;

    try {//from w ww .ja  v  a  2  s.  c  o  m
        inFile = new FileInputStream(aFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
        System.exit(1);
    }

    FileChannel inChannel = inFile.getChannel();
    final int COUNT = 6;
    ByteBuffer buf = ByteBuffer.allocate(8 * COUNT);
    long[] data = new long[COUNT];
    try {
        int pos = 0;
        while (inChannel.read(buf) != -1) {
            try {
                ((ByteBuffer) (buf.flip())).asLongBuffer().get(data);
                pos = data.length;
            } catch (BufferUnderflowException e) {
                LongBuffer longBuf = buf.asLongBuffer();
                pos = longBuf.remaining();
                longBuf.get(data, 0, pos);
            }
            System.out.println();
            for (int i = 0; i < pos; i++) {
                System.out.printf("%10d", data[i]);
            }
            buf.clear();
        }
        System.out.println("\nEOF reached.");
        inFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
        System.exit(1);
    }
}

---

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());//from   w  ww  .  ja va2s  .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:org.apache.commons.crypto.examples.CipherByteBufferExample.java

public static void main(String[] args) throws Exception {
    final SecretKeySpec key = new SecretKeySpec(getUTF8Bytes("1234567890123456"), "AES");
    final IvParameterSpec iv = new IvParameterSpec(getUTF8Bytes("1234567890123456"));
    Properties properties = new Properties();
    //Creates a CryptoCipher instance with the transformation and properties.
    final String transform = "AES/CBC/PKCS5Padding";
    final ByteBuffer outBuffer;
    final int bufferSize = 1024;
    final int updateBytes;
    final int finalBytes;
    try (CryptoCipher encipher = Utils.getCipherInstance(transform, properties)) {

        ByteBuffer inBuffer = ByteBuffer.allocateDirect(bufferSize);
        outBuffer = ByteBuffer.allocateDirect(bufferSize);
        inBuffer.put(getUTF8Bytes("hello world!"));

        inBuffer.flip(); // ready for the cipher to read it
        // Show the data is there
        System.out.println("inBuffer=" + asString(inBuffer));

        // Initializes the cipher with ENCRYPT_MODE,key and iv.
        encipher.init(Cipher.ENCRYPT_MODE, key, iv);
        // Continues a multiple-part encryption/decryption operation for byte buffer.
        updateBytes = encipher.update(inBuffer, outBuffer);
        System.out.println(updateBytes);

        // We should call do final at the end of encryption/decryption.
        finalBytes = encipher.doFinal(inBuffer, outBuffer);
        System.out.println(finalBytes);
    }/*from  w ww. ja va2  s .  c  om*/

    outBuffer.flip(); // ready for use as decrypt
    byte[] encoded = new byte[updateBytes + finalBytes];
    outBuffer.duplicate().get(encoded);
    System.out.println(Arrays.toString(encoded));

    // Now reverse the process
    try (CryptoCipher decipher = Utils.getCipherInstance(transform, properties)) {
        decipher.init(Cipher.DECRYPT_MODE, key, iv);
        ByteBuffer decoded = ByteBuffer.allocateDirect(bufferSize);
        decipher.update(outBuffer, decoded);
        decipher.doFinal(outBuffer, decoded);
        decoded.flip(); // ready for use
        System.out.println("decoded=" + asString(decoded));
    }
}

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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);/*from  w  w  w. j  a  va2  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();

}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    SocketChannel sChannel = SocketChannel.open();
    sChannel.configureBlocking(false);/*www. j  a  v a 2  s.co m*/
    sChannel.connect(new InetSocketAddress("hostName", 12345));

    int numBytesRead = sChannel.read(buf);

    if (numBytesRead == -1) {
        sChannel.close();
    } else {
        buf.flip();
    }
}

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From source file:com.talent.nio.communicate.receive.DecodeRunnable.java

/**
 * @param args//from  ww  w.j  a va 2  s.c  o m
 */
public static void main(String[] args) {
    byte[] bs1 = new byte[] { 1, 10, 11, 12 };
    byte[] bs2 = new byte[] { 2, 2, 2, 2 };
    byte[] bs3 = new byte[] { 3, 3, 3, 3 };
    byte[] bs4 = new byte[] { 4, 4, 4, 4 };
    byte[] bs5 = new byte[] { 5, 5, 5, 5 };
    byte[] bs6 = new byte[] { 6, 6, 6, 6 };

    ByteBuffer buffer1 = ByteBuffer.allocate(1024);
    buffer1.put(bs1);
    buffer1.flip();

    ByteBuf buf1 = Unpooled.copiedBuffer(buffer1);// .copiedBuffer(bs1);

    buffer1.put(bs3);

    ByteBuf buf2 = Unpooled.copiedBuffer(bs2);
    ByteBuf buf3 = Unpooled.copiedBuffer(bs3);
    ByteBuf buf4 = Unpooled.copiedBuffer(bs4);
    ByteBuf buf5 = Unpooled.copiedBuffer(bs5);
    ByteBuf buf6 = Unpooled.copiedBuffer(bs6);

    CompositeByteBuf cb = Unpooled.compositeBuffer();
    cb.addComponents(buf1, buf2, buf3);

    byte dd = cb.getByte(0);

    CompositeByteBuf cb2 = Unpooled.compositeBuffer();
    cb.addComponents(buf4, buf5, buf6);

    // cb.c
    // cb2.writerIndex(128 * 1024);

    cb.addComponent(cb2);

    Long number = cb2.readLong(); // causes IllegalBufferAccessException
                                  // here!

}

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