Example usage for java.nio.channels SocketChannel connect

Introduction

In this page you can find the example usage for java.nio.channels SocketChannel connect.

Prototype

public abstract boolean connect(SocketAddress remote) throws IOException;

Source Link

Document

Connects this channel's socket.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    SocketChannel sChannel = SocketChannel.open();
    sChannel.configureBlocking(false);/*from w w  w.  j  a  v  a2  s  .c  o  m*/

    sChannel.connect(new InetSocketAddress("hostName", 12345));

    while (!sChannel.finishConnect()) {
        // Do something else
    }

}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    SocketChannel sChannel = SocketChannel.open();
    sChannel.configureBlocking(false);//  w  ww. j a v  a  2s  .  c  om
    sChannel.connect(new InetSocketAddress("hostName", 12345));

    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    buf.put((byte) 0xFF);

    buf.flip();

    int numBytesWritten = sChannel.write(buf);
}

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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);/*  w  w w . ja  v a  2 s  . c o 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:MainClass.java

public static void main(String[] argv) throws Exception {
    String host = "localhost";
    int port = 80;

    InetSocketAddress addr = new InetSocketAddress(host, port);
    SocketChannel sc = SocketChannel.open();

    sc.configureBlocking(false);/*  w  w  w. j a  v a  2s  . c  o m*/

    System.out.println("initiating connection");

    sc.connect(addr);

    while (!sc.finishConnect()) {
        System.out.println("doing something useless");
    }

    System.out.println("connection established");

    sc.close();
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    InetAddress serverIPAddress = InetAddress.getByName("localhost");
    int port = 19000;
    InetSocketAddress serverAddress = new InetSocketAddress(serverIPAddress, port);
    Selector selector = Selector.open();
    SocketChannel channel = SocketChannel.open();
    channel.configureBlocking(false);//from  w  w w .  ja va 2 s .com
    channel.connect(serverAddress);
    int operations = SelectionKey.OP_CONNECT | SelectionKey.OP_READ | SelectionKey.OP_WRITE;
    channel.register(selector, operations);

    userInputReader = new BufferedReader(new InputStreamReader(System.in));
    while (true) {
        if (selector.select() > 0) {
            boolean doneStatus = processReadySet(selector.selectedKeys());
            if (doneStatus) {
                break;
            }
        }
    }
    channel.close();
}

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From source file:GetWebPageDemo.java

public static void main(String args[]) throws Exception {
    String resource, host, file;//from  w  ww .  j av a2 s .  com
    int slashPos;

    resource = "www.java2s.com/index.htm";
    slashPos = resource.indexOf('/'); // find host/file separator
    if (slashPos < 0) {
        resource = resource + "/";
        slashPos = resource.indexOf('/');
    }
    file = resource.substring(slashPos); // isolate host and file parts
    host = resource.substring(0, slashPos);
    System.out.println("Host to contact: '" + host + "'");
    System.out.println("File to fetch : '" + file + "'");

    SocketChannel channel = null;

    try {
        Charset charset = Charset.forName("ISO-8859-1");
        CharsetDecoder decoder = charset.newDecoder();
        CharsetEncoder encoder = charset.newEncoder();

        ByteBuffer buffer = ByteBuffer.allocateDirect(1024);
        CharBuffer charBuffer = CharBuffer.allocate(1024);

        InetSocketAddress socketAddress = new InetSocketAddress(host, 80);
        channel = SocketChannel.open();
        channel.connect(socketAddress);

        String request = "GET " + file + " \r\n\r\n";
        channel.write(encoder.encode(CharBuffer.wrap(request)));

        while ((channel.read(buffer)) != -1) {
            buffer.flip();
            decoder.decode(buffer, charBuffer, false);
            charBuffer.flip();
            System.out.println(charBuffer);
            buffer.clear();
            charBuffer.clear();
        }
    } catch (UnknownHostException e) {
        System.err.println(e);
    } catch (IOException e) {
        System.err.println(e);
    } finally {
        if (channel != null) {
            try {
                channel.close();
            } catch (IOException ignored) {
            }
        }
    }

    System.out.println("\nDone.");
}

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From source file:GetWebPageApp.java

public static void main(String args[]) throws Exception {
    String resource, host, file;/*from  ww  w .j av  a 2 s  .  c  o  m*/
    int slashPos;

    resource = "www.java2s.com/index.htm"; // skip HTTP://
    slashPos = resource.indexOf('/'); // find host/file separator
    if (slashPos < 0) {
        resource = resource + "/";
        slashPos = resource.indexOf('/');
    }
    file = resource.substring(slashPos); // isolate host and file parts
    host = resource.substring(0, slashPos);
    System.out.println("Host to contact: '" + host + "'");
    System.out.println("File to fetch : '" + file + "'");

    SocketChannel channel = null;

    try {
        Charset charset = Charset.forName("ISO-8859-1");
        CharsetDecoder decoder = charset.newDecoder();
        CharsetEncoder encoder = charset.newEncoder();

        ByteBuffer buffer = ByteBuffer.allocateDirect(1024);
        CharBuffer charBuffer = CharBuffer.allocate(1024);

        InetSocketAddress socketAddress = new InetSocketAddress(host, 80);
        channel = SocketChannel.open();
        channel.configureBlocking(false);
        channel.connect(socketAddress);

        selector = Selector.open();

        channel.register(selector, SelectionKey.OP_CONNECT | SelectionKey.OP_READ);

        while (selector.select(500) > 0) {
            Set readyKeys = selector.selectedKeys();
            try {
                Iterator readyItor = readyKeys.iterator();

                while (readyItor.hasNext()) {

                    SelectionKey key = (SelectionKey) readyItor.next();
                    readyItor.remove();
                    SocketChannel keyChannel = (SocketChannel) key.channel();

                    if (key.isConnectable()) {
                        if (keyChannel.isConnectionPending()) {
                            keyChannel.finishConnect();
                        }
                        String request = "GET " + file + " \r\n\r\n";
                        keyChannel.write(encoder.encode(CharBuffer.wrap(request)));
                    } else if (key.isReadable()) {
                        keyChannel.read(buffer);
                        buffer.flip();

                        decoder.decode(buffer, charBuffer, false);
                        charBuffer.flip();
                        System.out.print(charBuffer);

                        buffer.clear();
                        charBuffer.clear();

                    } else {
                        System.err.println("Unknown key");
                    }
                }
            } catch (ConcurrentModificationException e) {
            }
        }
    } catch (UnknownHostException e) {
        System.err.println(e);
    } catch (IOException e) {
        System.err.println(e);
    } finally {
        if (channel != null) {
            try {
                channel.close();
            } catch (IOException ignored) {
            }
        }
    }
    System.out.println("\nDone.");
}

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From source file:com.buaa.cfs.net.SocketIOWithTimeout.java

/**
 * The contract is similar to {@link SocketChannel#connect(SocketAddress)} with a timeout.
 *
 * @param channel  - this should be a {@link SelectableChannel}
 * @param endpoint/* w  w w.  j  av a2 s  .  co m*/
 *
 * @throws IOException
 * @see SocketChannel#connect(SocketAddress)
 */
static void connect(SocketChannel channel, SocketAddress endpoint, int timeout) throws IOException {

    boolean blockingOn = channel.isBlocking();
    if (blockingOn) {
        channel.configureBlocking(false);
    }

    try {
        if (channel.connect(endpoint)) {
            return;
        }

        long timeoutLeft = timeout;
        long endTime = (timeout > 0) ? (Time.now() + timeout) : 0;

        while (true) {
            // we might have to call finishConnect() more than once
            // for some channels (with user level protocols)

            int ret = selector.select((SelectableChannel) channel, SelectionKey.OP_CONNECT, timeoutLeft);

            if (ret > 0 && channel.finishConnect()) {
                return;
            }

            if (ret == 0 || (timeout > 0 && (timeoutLeft = (endTime - Time.now())) <= 0)) {
                throw new SocketTimeoutException(
                        timeoutExceptionString(channel, timeout, SelectionKey.OP_CONNECT));
            }
        }
    } catch (IOException e) {
        // javadoc for SocketChannel.connect() says channel should be closed.
        try {
            channel.close();
        } catch (IOException ignored) {
        }
        throw e;
    } finally {
        if (blockingOn && channel.isOpen()) {
            channel.configureBlocking(true);
        }
    }
}

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From source file:eu.stratosphere.nephele.net.SocketIOWithTimeout.java

/**
 * The contract is similar to {@link SocketChannel#connect(SocketAddress)} with a timeout.
 * // ww  w . j av  a2  s.co  m
 * @see SocketChannel#connect(SocketAddress)
 * @param channel
 *        - this should be a {@link SelectableChannel}
 * @param endpoint
 * @throws IOException
 */
static void connect(SocketChannel channel, SocketAddress endpoint, int timeout) throws IOException {

    boolean blockingOn = channel.isBlocking();
    if (blockingOn) {
        channel.configureBlocking(false);
    }

    try {
        if (channel.connect(endpoint)) {
            return;
        }

        long timeoutLeft = timeout;
        long endTime = (timeout > 0) ? (System.currentTimeMillis() + timeout) : 0;

        while (true) {
            // we might have to call finishConnect() more than once
            // for some channels (with user level protocols)

            int ret = selector.select((SelectableChannel) channel, SelectionKey.OP_CONNECT, timeoutLeft);

            if (ret > 0 && channel.finishConnect()) {
                return;
            }

            if (ret == 0 || (timeout > 0 && (timeoutLeft = (endTime - System.currentTimeMillis())) <= 0)) {
                throw new SocketTimeoutException(
                        timeoutExceptionString(channel, timeout, SelectionKey.OP_CONNECT));
            }
        }
    } catch (IOException e) {
        // javadoc for SocketChannel.connect() says channel should be closed.
        try {
            channel.close();
        } catch (IOException ignored) {
        }
        throw e;
    } finally {
        if (blockingOn && channel.isOpen()) {
            channel.configureBlocking(true);
        }
    }
}

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From source file:gridool.util.net.PoolableSocketChannelFactory.java

private static SocketChannel createSocketChannel(final SocketAddress sockAddr, final boolean blocking,
        final int rcvbufSize) {
    final SocketChannel ch;
    try {// w  ww .j ava 2 s .  co m
        ch = SocketChannel.open();
        ch.configureBlocking(blocking);
    } catch (IOException e) {
        LOG.error("Failed to open SocketChannel.", e);
        throw new IllegalStateException(e);
    }
    final Socket sock = ch.socket();
    if (rcvbufSize != -1) {
        try {
            sock.setReceiveBufferSize(rcvbufSize);
        } catch (SocketException e) {
            LOG.error("Failed to setReceiveBufferSize.", e);
            throw new IllegalStateException(e);
        }
    }
    try {
        ch.connect(sockAddr);
    } catch (IOException e) {
        LOG.error("Failed to connect socket: " + sockAddr, e);
        throw new IllegalStateException(e);
    }
    return ch;
}

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