Example usage for java.nio ByteBuffer wrap

List of usage examples for java.nio ByteBuffer wrap

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Introduction

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

Prototype

public static ByteBuffer wrap(byte[] array)

Source Link

Document

Creates a new byte buffer by wrapping the given byte array.

Usage

From source file:Test.java

License:asdf

public static void main(String[] args) throws IOException {
    Path path = Paths.get("/users.txt");

    final String newLine = System.getProperty("line.separator");
    try (SeekableByteChannel sbc = Files.newByteChannel(path, StandardOpenOption.WRITE)) {
        ByteBuffer buffer;/*  ww  w .j  av  a  2s.  c o m*/
        long position = sbc.size();
        sbc.position(position);
        System.out.println("Position: " + sbc.position());

        buffer = ByteBuffer.wrap((newLine + "asdf").getBytes());
        sbc.write(buffer);
        System.out.println("Position: " + sbc.position());
        buffer = ByteBuffer.wrap((newLine + "asdf").getBytes());
        sbc.write(buffer);
        System.out.println("Position: " + sbc.position());
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    DatagramChannel server = DatagramChannel.open();
    server.bind(null);//ww w  .  j a v  a 2 s .c o  m
    NetworkInterface interf = NetworkInterface.getByName(MULTICAST_INTERFACE_NAME);
    server.setOption(StandardSocketOptions.IP_MULTICAST_IF, interf);

    String msg = "Hello!";
    ByteBuffer buffer = ByteBuffer.wrap(msg.getBytes());
    InetSocketAddress group = new InetSocketAddress(MULTICAST_IP, MULTICAST_PORT);

    server.send(buffer, group);
    System.out.println("Sent the   multicast  message: " + msg);
}

From source file:Test.java

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

    AsynchronousSocketChannel client = AsynchronousSocketChannel.open();
    InetSocketAddress address = new InetSocketAddress("localhost", 5000);

    Future<Void> future = client.connect(address);
    System.out.println("Client: Waiting for the connection to complete");
    future.get();/* w  ww .  j a  va  2 s .com*/

    String message = "";
    while (!message.equals("quit")) {
        System.out.print("Enter a message: ");
        Scanner scanner = new Scanner(System.in);
        message = scanner.nextLine();
        System.out.println("Client: Sending ...");
        ByteBuffer buffer = ByteBuffer.wrap(message.getBytes());
        System.out.println("Client: Message sent: " + new String(buffer.array()));
        client.write(buffer);
    }
}

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 ww w.  j  av a  2 s .co 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[] args) throws IOException {

    URL u = new URL("http://www.java2s.com");
    String host = u.getHost();/*  w w w  . j  a  v a2  s  .com*/
    int port = 80;
    String file = "/";

    SocketAddress remote = new InetSocketAddress(host, port);
    SocketChannel channel = SocketChannel.open(remote);
    FileOutputStream out = new FileOutputStream("yourfile.htm");
    FileChannel localFile = out.getChannel();

    String request = "GET " + file + " HTTP/1.1\r\n" + "User-Agent: HTTPGrab\r\n" + "Accept: text/*\r\n"
            + "Connection: close\r\n" + "Host: " + host + "\r\n" + "\r\n";

    ByteBuffer header = ByteBuffer.wrap(request.getBytes("US-ASCII"));
    channel.write(header);

    ByteBuffer buffer = ByteBuffer.allocate(8192);
    while (channel.read(buffer) != -1) {
        buffer.flip();
        localFile.write(buffer);
        buffer.clear();
    }

    localFile.close();
    channel.close();
}

From source file:com.bia.config.Main.java

public static void main(String[] args) throws Exception {
    ApplicationContext context = new ClassPathXmlApplicationContext("META-INF/spring/applicationContext*.xml");

    EmployeeCassandraServiceImpl service = context.getBean(EmployeeCassandraServiceImpl.class);

    Emp emp = new Emp();
    emp.setId((new Date()).toString());
    String username = "IM-" + new Date();
    emp.setUsername(username);//from  w  w w. j a va  2 s  . co m
    emp.setJoinDate(new Date());
    emp.setStorageSize(10.0);
    emp.setContent(ByteBuffer
            .wrap(IOUtils.toByteArray(Main.class.getClassLoader().getResourceAsStream("log4j.properties"))));

    service.saveEmployee(emp);
    int count = 0;
    for (Emp e : service.findAllEmployees()) {
        System.out.println(e + String.valueOf(e.getContent()));
        System.out.println(new String(e.getContent().array()));
        count++;
    }

    System.out.println("done " + count);

    System.out.println(service.findByUsername(username));

}

From source file:Test.java

public static void main(String[] args) throws Exception {
    AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("/asynchronous.txt"),
            StandardOpenOption.READ, StandardOpenOption.WRITE, StandardOpenOption.CREATE);
    CompletionHandler<Integer, Object> handler = new CompletionHandler<Integer, Object>() {

        @Override//from  w w  w  .  j  a va  2  s. c o  m
        public void completed(Integer result, Object attachment) {
            System.out.println("Attachment: " + attachment + " " + result + " bytes written");
            System.out.println("CompletionHandler Thread ID: " + Thread.currentThread().getId());
        }

        @Override
        public void failed(Throwable e, Object attachment) {
            System.err.println("Attachment: " + attachment + " failed with:");
            e.printStackTrace();
        }
    };

    System.out.println("Main Thread ID: " + Thread.currentThread().getId());
    fileChannel.write(ByteBuffer.wrap("Sample".getBytes()), 0, "First Write", handler);
    fileChannel.write(ByteBuffer.wrap("Box".getBytes()), 0, "Second Write", handler);

}

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 v a  2 s. 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: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());/* w  w w.java  2  s  .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:MainClass.java

public static void main(String[] args) throws IOException {
    for (int i = 0; i < data.length; i++)
        data[i] = (byte) i;

    ServerSocketChannel server = ServerSocketChannel.open();
    server.configureBlocking(false);/*from   www. j a  v  a2 s .c  o  m*/

    server.socket().bind(new InetSocketAddress(9000));
    Selector selector = Selector.open();
    server.register(selector, SelectionKey.OP_ACCEPT);

    while (true) {
        selector.select();
        Set readyKeys = selector.selectedKeys();
        Iterator iterator = readyKeys.iterator();
        while (iterator.hasNext()) {
            SelectionKey key = (SelectionKey) iterator.next();
            iterator.remove();
            if (key.isAcceptable()) {
                SocketChannel client = server.accept();
                System.out.println("Accepted connection from " + client);
                client.configureBlocking(false);
                ByteBuffer source = ByteBuffer.wrap(data);
                SelectionKey key2 = client.register(selector, SelectionKey.OP_WRITE);
                key2.attach(source);
            } else if (key.isWritable()) {
                SocketChannel client = (SocketChannel) key.channel();
                ByteBuffer output = (ByteBuffer) key.attachment();
                if (!output.hasRemaining()) {
                    output.rewind();
                }
                client.write(output);
            }
            key.channel().close();
        }
    }
}