Example usage for java.nio ByteBuffer get

List of usage examples for java.nio ByteBuffer get

Introduction

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

Prototype

public abstract byte get(int index);

Source Link

Document

Returns the byte at the specified index and does not change the position.

Usage

From source file:com.openteach.diamond.network.waverider.session.DefaultSession.java

public static void main(String[] args) {

    BlockingQueue<ByteBuffer> inputBuffer = new LinkedBlockingQueue<ByteBuffer>();
    /*for (int i = 0; i < 10; i++)
    {*//*from  w w  w.j ava2s  .  c  o  m*/
    ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
    byteBuffer.put(makePacket().marshall());
    byteBuffer.put(makePacket().marshall());
    byteBuffer.flip();
    byte[] b = new byte[8];
    ByteBuffer halfBuf0 = ByteBuffer.allocate(8);
    byteBuffer.get(b);
    halfBuf0.put(b);
    halfBuf0.flip();
    inputBuffer.add(halfBuf0);
    inputBuffer.add(byteBuffer);
    /*}*/

    int size = 0;
    int oldSize = size;
    long length = Packet.getHeaderSize();
    ByteBuffer buffer = ByteBuffer.allocate(NetWorkConstants.DEFAULT_NETWORK_BUFFER_SIZE);
    ByteBuffer currentBuffer = null;

    while (size < length) {
        currentBuffer = inputBuffer.peek();
        oldSize = size;
        int position = currentBuffer.position();
        size += currentBuffer.remaining();
        buffer.put(currentBuffer);
        if (size >= Packet.getHeaderSize()) {
            length = buffer.getLong(Packet.getLengthPosition());
        }

        if (size <= length) {
            inputBuffer.remove();
        } else {
            currentBuffer.position(position);
            buffer.position(buffer.position() - currentBuffer.remaining());
            byte[] buf = new byte[(int) (length - oldSize)];
            currentBuffer.get(buf);
            buffer.put(buf);
        }
    }

    // buffer.position(0);
    buffer.flip();
    Packet packet = Packet.unmarshall(buffer);

    Command command = CommandFactory.createCommand(packet.getType(), packet.getPayLoad());

    String str = new String(command.getPayLoad().array());

    System.out.println(str);

}

From source file:HttpGet.java

public static void main(String[] args) {
    SocketChannel server = null; // Channel for reading from server
    FileOutputStream outputStream = null; // Stream to destination file
    WritableByteChannel destination; // Channel to write to it

    try { // Exception handling and channel closing code follows this block

        // Parse the URL. Note we use the new java.net.URI, not URL here.
        URI uri = new URI(args[0]);

        // Now query and verify the various parts of the URI
        String scheme = uri.getScheme();
        if (scheme == null || !scheme.equals("http"))
            throw new IllegalArgumentException("Must use 'http:' protocol");

        String hostname = uri.getHost();

        int port = uri.getPort();
        if (port == -1)
            port = 80; // Use default port if none specified

        String path = uri.getRawPath();
        if (path == null || path.length() == 0)
            path = "/";

        String query = uri.getRawQuery();
        query = (query == null) ? "" : '?' + query;

        // Combine the hostname and port into a single address object.
        // java.net.SocketAddress and InetSocketAddress are new in Java 1.4
        SocketAddress serverAddress = new InetSocketAddress(hostname, port);

        // Open a SocketChannel to the server
        server = SocketChannel.open(serverAddress);

        // Put together the HTTP request we'll send to the server.
        String request = "GET " + path + query + " HTTP/1.1\r\n" + // The request
                "Host: " + hostname + "\r\n" + // Required in HTTP 1.1
                "Connection: close\r\n" + // Don't keep connection open
                "User-Agent: " + HttpGet.class.getName() + "\r\n" + "\r\n"; // Blank
                                                                            // line
                                                                            // indicates
                                                                            // end of
                                                                            // request
                                                                            // headers

        // Now wrap a CharBuffer around that request string
        CharBuffer requestChars = CharBuffer.wrap(request);

        // Get a Charset object to encode the char buffer into bytes
        Charset charset = Charset.forName("ISO-8859-1");

        // Use the charset to encode the request into a byte buffer
        ByteBuffer requestBytes = charset.encode(requestChars);

        // Finally, we can send this HTTP request to the server.
        server.write(requestBytes);//w  w w. j av a2s . c  o m

        // Set up an output channel to send the output to.
        if (args.length > 1) { // Use a specified filename
            outputStream = new FileOutputStream(args[1]);
            destination = outputStream.getChannel();
        } else
            // Or wrap a channel around standard out
            destination = Channels.newChannel(System.out);

        // Allocate a 32 Kilobyte byte buffer for reading the response.
        // Hopefully we'll get a low-level "direct" buffer
        ByteBuffer data = ByteBuffer.allocateDirect(32 * 1024);

        // Have we discarded the HTTP response headers yet?
        boolean skippedHeaders = false;
        // The code sent by the server
        int responseCode = -1;

        // Now loop, reading data from the server channel and writing it
        // to the destination channel until the server indicates that it
        // has no more data.
        while (server.read(data) != -1) { // Read data, and check for end
            data.flip(); // Prepare to extract data from buffer

            // All HTTP reponses begin with a set of HTTP headers, which
            // we need to discard. The headers end with the string
            // "\r\n\r\n", or the bytes 13,10,13,10. If we haven't already
            // skipped them then do so now.
            if (!skippedHeaders) {
                // First, though, read the HTTP response code.
                // Assume that we get the complete first line of the
                // response when the first read() call returns. Assume also
                // that the first 9 bytes are the ASCII characters
                // "HTTP/1.1 ", and that the response code is the ASCII
                // characters in the following three bytes.
                if (responseCode == -1) {
                    responseCode = 100 * (data.get(9) - '0') + 10 * (data.get(10) - '0')
                            + 1 * (data.get(11) - '0');

                    // If there was an error, report it and quit
                    // Note that we do not handle redirect responses.
                    if (responseCode < 200 || responseCode >= 300) {
                        System.err.println("HTTP Error: " + responseCode);
                        System.exit(1);
                    }
                }

                // Now skip the rest of the headers.
                try {
                    for (;;) {
                        if ((data.get() == 13) && (data.get() == 10) && (data.get() == 13)
                                && (data.get() == 10)) {
                            skippedHeaders = true;
                            break;
                        }
                    }
                } catch (BufferUnderflowException e) {
                    // If we arrive here, it means we reached the end of
                    // the buffer and didn't find the end of the headers.
                    // There is a chance that the last 1, 2, or 3 bytes in
                    // the buffer were the beginning of the \r\n\r\n
                    // sequence, so back up a bit.
                    data.position(data.position() - 3);
                    // Now discard the headers we have read
                    data.compact();
                    // And go read more data from the server.
                    continue;
                }
            }

            // Write the data out; drain the buffer fully.
            while (data.hasRemaining())
                destination.write(data);

            // Now that the buffer is drained, put it into fill mode
            // in preparation for reading more data into it.
            data.clear(); // data.compact() also works here
        }
    } catch (Exception e) { // Report any errors that arise
        System.err.println(e);
        System.err.println("Usage: java HttpGet <URL> [<filename>]");
    } finally { // Close the channels and output file stream, if needed
        try {
            if (server != null && server.isOpen())
                server.close();
            if (outputStream != null)
                outputStream.close();
        } catch (IOException e) {
        }
    }
}

From source file:Main.java

public static short getUnsignedByte(ByteBuffer bb, int position) {
    return ((short) (bb.get(position) & (short) 0xff));
}

From source file:Main.java

public static short getUnsignedByte(final ByteBuffer pByteBuffer, final int pPosition) {
    return (short) (pByteBuffer.get(pPosition) & (short) 0xFF);
}

From source file:Main.java

public static InputStream toStream(ByteBuffer bytebuffer) {
    byte abyte0[] = new byte[bytebuffer.remaining()];
    bytebuffer.get(abyte0);
    return new ByteArrayInputStream(abyte0);
}

From source file:Main.java

public static String readMAString(ByteBuffer in) {
    int tmp = in.getInt();
    byte[] dst = new byte[tmp];
    in.get(dst);
    String ret = Charset.forName("UTF-8").decode(ByteBuffer.wrap(dst)).toString();
    return ret;//w w  w .  j av a  2s  . co m
}

From source file:Main.java

private static void skipStartCode(ByteBuffer prefixedSpsBuffer) {
    byte[] prefix3 = new byte[3];
    prefixedSpsBuffer.get(prefix3);
    if (Arrays.equals(prefix3, AVC_START_CODE_3))
        return;/* w  w w .  ja  v  a  2 s  .  co  m*/

    byte[] prefix4 = Arrays.copyOf(prefix3, 4);
    prefix4[3] = prefixedSpsBuffer.get();
    if (Arrays.equals(prefix4, AVC_START_CODE_4))
        return;
    throw new IllegalStateException("AVC NAL start code does not found in csd.");
}

From source file:Main.java

public static int getTypeNew(ByteBuffer buf) {
    int type = -1;
    if (buf != null && buf.capacity() > 11) {
        type = buf.get(11);
    }//from w  w w .  j  ava  2  s  .c  o m
    return type;
}

From source file:Main.java

/**
 * Wraps a ByteBuffer in an InputStream. 
 * /*from  ww w. j av a  2s . c  o  m*/
 * @param byteBuffer The ByteBuffer to wrap.
 * 
 * @return An InputStream wrapping the ByteBuffer content.
 */
public static InputStream toStream(ByteBuffer byteBuffer) {
    byte[] bytes = new byte[byteBuffer.remaining()];
    byteBuffer.get(bytes);
    return new ByteArrayInputStream(bytes);
}

From source file:Main.java

private static byte[] encode(String text, Charset charset) {
    ByteBuffer buffer = charset.encode(text);
    byte[] bytes = new byte[buffer.limit()];
    buffer.get(bytes);
    return bytes;
}