Example usage for java.nio ByteBuffer flip

List of usage examples for java.nio ByteBuffer flip

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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:com.msr.dnsdemo.network.DownloadFile.java

public static void fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException, NullPointerException {
    if (src != null && dest != null) {
        final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
        while (src.read(buffer) != -1) {
            // prepare the buffer to be drained
            buffer.flip();
            // write to the channel, may block
            dest.write(buffer);/*from www . j a  v  a 2 s  . c  om*/
            // If partial transfer, shift remainder down
            // If buffer is empty, same as doing clear()
            buffer.compact();
        }
        // EOF will leave buffer in fill state
        buffer.flip();
        // make sure the buffer is fully drained.
        while (buffer.hasRemaining()) {
            dest.write(buffer);
        }
    }
}

From source file:Main.java

public static void readData(SeekableByteChannel seekableChannel, Charset cs) throws IOException {
    ByteBuffer byteBuffer = ByteBuffer.allocate(128);
    String encoding = System.getProperty("file.encoding");
    while (seekableChannel.read(byteBuffer) > 0) {
        byteBuffer.rewind();/*www.  j  a  v a  2s .c o  m*/
        CharBuffer charBuffer = cs.decode(byteBuffer);
        System.out.print(charBuffer);
        byteBuffer.flip();
    }
}

From source file:com.chicm.cmraft.rpc.PacketUtils.java

private static int writeRpc(AsynchronousSocketChannel channel, Message header, Message body, int totalSize)
        throws IOException, InterruptedException, ExecutionException {
    // writing total size so that server can read all request data in one read
    //LOG.debug("total size:" + totalSize);
    long t = System.currentTimeMillis();

    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    writeIntToStream(totalSize, bos);// www.jav  a  2  s. c  o  m

    header.writeDelimitedTo(bos);
    if (body != null)
        body.writeDelimitedTo(bos);

    bos.flush();
    byte[] b = bos.toByteArray();
    ByteBuffer buf = ByteBuffer.allocateDirect(totalSize + 4);
    buf.put(b);

    buf.flip();
    channel.write(buf).get();

    if (LOG.isTraceEnabled()) {
        LOG.trace("Write Rpc message to socket, takes " + (System.currentTimeMillis() - t) + " ms, size "
                + totalSize);
        LOG.trace("message:" + body);
    }
    return totalSize;
}

From source file:fi.johannes.kata.ocr.utils.files.CFileOperations.java

public static void writeToFile(ByteBuffer bb, String outputFile) throws IOException {
    bb.flip();
    try (BufferedWriter bw = new BufferedWriter(new PrintWriter(outputFile, "UTF-8"))) {
        CharBuffer charBuffer = StandardCharsets.UTF_8.decode(bb);
        bw.write(charBuffer.toString());
        charBuffer.clear();/*from www.  j a v a 2s  . com*/
    }
}

From source file:ja.centre.util.io.Files.java

public static void copy(String source, String destination) throws IOException {
    FileInputStream fis = null;/* w w  w. jav a  2 s.  c o m*/
    FileOutputStream fos = null;
    try {
        fis = new FileInputStream(source);
        fos = new FileOutputStream(destination);

        FileChannel fic = null;
        FileChannel foc = null;
        try {
            fic = fis.getChannel();
            foc = fos.getChannel();

            ByteBuffer buffer = ByteBuffer.allocate(COPY_BUFFER_SIZE);
            do {
                buffer.flip();
                foc.write(buffer);
                buffer.clear();
            } while (fic.read(buffer) != -1);
        } finally {
            closeQuietly(fic);
            closeQuietly(foc);
        }
    } finally {
        closeQuietly(fis);
        closeQuietly(fos);
    }
}

From source file:com.log4ic.compressor.utils.FileUtils.java

/**
 * ?//from w w w  .  ja  v  a2 s .co m
 *
 * @param content
 * @param filePath
 * @return
 */
public static File writeFile(byte[] content, String filePath) {
    FileOutputStream out = null;
    FileChannel outChannel = null;
    File file = new File(filePath);

    if (file.exists()) {
        file.delete();
    }

    if (!file.getParentFile().exists()) {
        file.getParentFile().mkdirs();
    }

    ByteBuffer outBuffer = ByteBuffer.allocate(content.length);
    outBuffer.put(content);
    outBuffer.flip();
    try {
        out = new FileOutputStream(file);

        outChannel = out.getChannel();

        outChannel.write(outBuffer);

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (outChannel != null) {
            try {
                outChannel.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (out != null) {
            try {
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    return file.exists() ? file : null;
}

From source file:com.icloud.framework.core.nio.ByteBufferUtil.java

public static ByteBuffer clone(ByteBuffer o) {
    assert o != null;

    if (o.remaining() == 0)
        return ByteBuffer.wrap(ArrayUtils.EMPTY_BYTE_ARRAY);

    ByteBuffer clone = ByteBuffer.allocate(o.remaining());

    if (o.isDirect()) {
        for (int i = o.position(); i < o.limit(); i++) {
            clone.put(o.get(i));/*w  ww . j ava 2s  .c  om*/
        }
        clone.flip();
    } else {
        System.arraycopy(o.array(), o.arrayOffset() + o.position(), clone.array(), 0, o.remaining());
    }

    return clone;
}

From source file:ja.lingo.engine.util.EngineFiles.java

private static void appendFile(String fileName, FileOutputStream fos, boolean prependWithLength)
        throws IOException {
    FileInputStream fis = new FileInputStream(fileName);
    FileChannel fic = fis.getChannel();
    FileChannel foc = fos.getChannel();

    ByteBuffer buffer = ByteBuffer.allocate(COPY_BUFFER_SIZE);

    // put header: length (1 int = 4 bytes)
    if (prependWithLength) {
        buffer.putInt((int) new File(fileName).length());
    }/*from www . jav a 2  s .  com*/

    // put body
    do {
        buffer.flip();
        foc.write(buffer);
        buffer.clear();
    } while (fic.read(buffer) != -1);
    fic.close();
    // NOTE: do not close 'foc'

    Files.delete(fileName);
}

From source file:StreamUtil.java

/**
 * Copies the content read from InputStream to OutputStream. Uses the NIO Channels to copy.
 * @param is The InputStream that is read.
 * @param os The OutputStream where the data is written.
 * @throws IOException//from  w w  w  .  j  a v  a2 s . c o m
 */
public static void copy(final InputStream is, final OutputStream os) throws IOException {
    final ReadableByteChannel inChannel = Channels.newChannel(is);
    final WritableByteChannel outChannel = Channels.newChannel(os);

    try {
        final ByteBuffer buffer = ByteBuffer.allocate(65536);
        while (true) {
            int bytesRead = inChannel.read(buffer);
            if (bytesRead == -1)
                break;
            buffer.flip();
            while (buffer.hasRemaining())
                outChannel.write(buffer);
            buffer.clear();
        }
    } finally {
        try {
            inChannel.close();
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        }
        try {
            outChannel.close();
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        }
    }
}

From source file:com.offbynull.portmapper.natpmp.NatPmpDiscovery.java

private static Set<InetAddress> discoverGateways() throws InterruptedException, IOException {
    final Set<InetAddress> foundGateways = Collections.synchronizedSet(new HashSet<InetAddress>());
    Set<InetAddress> potentialGateways = NetworkUtils.getPotentialGatewayAddresses(); // port 5351

    DatagramChannel unicastChannel = null;
    try {/*from   w  ww .j  a  v  a 2  s.com*/
        unicastChannel = DatagramChannel.open();
        unicastChannel.configureBlocking(false);
        unicastChannel.socket().bind(new InetSocketAddress(0));
    } catch (IOException ioe) {
        IOUtils.closeQuietly(unicastChannel);
        throw ioe;
    }

    UdpCommunicator communicator = null;
    try {
        communicator = new UdpCommunicator(Collections.singletonList(unicastChannel));
        communicator.startAsync().awaitRunning();
        communicator.addListener(new UdpCommunicatorListener() {

            @Override
            public void incomingPacket(InetSocketAddress sourceAddress, DatagramChannel channel,
                    ByteBuffer packet) {
                new ExternalAddressNatPmpResponse(packet); // should error out if not valid

                foundGateways.add(sourceAddress.getAddress());
            }
        });

        ByteBuffer outBuf = ByteBuffer.allocate(16);
        ExternalAddressNatPmpRequest eanpr = new ExternalAddressNatPmpRequest();
        eanpr.dump(outBuf);

        outBuf.flip();

        for (InetAddress potentialGateway : potentialGateways) {
            communicator.send(unicastChannel, new InetSocketAddress(potentialGateway, 5351),
                    outBuf.asReadOnlyBuffer());
        }

        Thread.sleep(5000L);
    } finally {
        if (communicator != null) {
            communicator.stopAsync().awaitTerminated();
        }
    }

    return new HashSet<>(foundGateways);
}