Example usage for java.nio CharBuffer clear

Introduction

In this page you can find the example usage for java.nio CharBuffer clear.

Prototype

public final Buffer clear() 

Source Link

Document

Clears this buffer.

Usage

From source file:MainClass.java

public static void main(String[] argv) throws Exception {
    CharBuffer buffer = CharBuffer.wrap("01234567");

    buffer.position(3).limit(6).mark().position(5);

    CharBuffer dupeBuffer = buffer.duplicate();

    buffer.clear();

    println(buffer);/*from  w w w  .j  av a 2s.  c  o  m*/
    println(dupeBuffer);

    dupeBuffer.reset();
    println(dupeBuffer);

    dupeBuffer.clear();
    println(dupeBuffer);
}

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From source file:MainClass.java

public static void main(String[] argv) throws Exception {
    char[] chars = new char[60];

    CharBuffer cb = CharBuffer.wrap(chars, 12, 42);

    println(cb);//ww w  .j a v a  2 s.co m

    cb.put("This is a test String");

    cb.flip();

    println(cb);

    cb.clear();

    cb.put("Foobar");

    println(cb);

    for (int i = 0; i < 20; i++) {
        System.out.println("[" + i + "] = " + chars[i]);
    }
}

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From source file:MainClass.java

License:asdf

public static void main(String[] argv) throws Exception {
    CharBuffer buffer = CharBuffer.allocate(100);

    String string = "asdf";

    for (int i = 0; i < string.length(); i++) {
        buffer.put(string.charAt(i));/*w w w . j a  v a  2s . c o m*/
    }

    buffer.flip();
    drainBuffer(buffer);
    buffer.clear();
}

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From source file:MainClass.java

public static void main(String[] args) {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/test/primes.txt");
    FileOutputStream outputFile = null;
    try {/*from  www . java 2 s.  co m*/
        outputFile = new FileOutputStream(aFile);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel file = outputFile.getChannel();
    final int BUFFERSIZE = 100;
    ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
    DoubleBuffer doubleBuf = buf.asDoubleBuffer();
    buf.position(8);
    CharBuffer charBuf = buf.asCharBuffer();
    for (long prime : primes) {
        String primeStr = "prime = " + prime;
        doubleBuf.put(0, (double) primeStr.length());
        charBuf.put(primeStr);
        buf.position(2 * charBuf.position() + 8);
        LongBuffer longBuf = buf.asLongBuffer();
        longBuf.put(prime);
        buf.position(buf.position() + 8);
        buf.flip();
        try {
            file.write(buf);
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
        buf.clear();
        doubleBuf.clear();
        charBuf.clear();
    }
    try {
        System.out.println("File written is " + file.size() + "bytes.");
        outputFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

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From source file:GetWebPageDemo.java

public static void main(String args[]) throws Exception {
    String resource, host, file;//from  w w  w  .ja va  2  s.  co m
    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:MainClass.java

public static void main(String[] args) {
    String[] phrases = { "A", "B 1", "C 1.3" };
    String dirname = "C:/test";
    String filename = "Phrases.txt";
    File dir = new File(dirname);
    File aFile = new File(dir, filename);
    FileOutputStream outputFile = null;
    try {//from  w ww  .jav  a  2  s  .c  o m
        outputFile = new FileOutputStream(aFile, true);
    } catch (FileNotFoundException e) {
        e.printStackTrace(System.err);
    }
    FileChannel outChannel = outputFile.getChannel();
    ByteBuffer buf = ByteBuffer.allocate(1024);
    System.out.println(buf.position());
    System.out.println(buf.limit());
    System.out.println(buf.capacity());
    CharBuffer charBuf = buf.asCharBuffer();
    System.out.println(charBuf.position());
    System.out.println(charBuf.limit());
    System.out.println(charBuf.capacity());
    Formatter formatter = new Formatter(charBuf);
    int number = 0;
    for (String phrase : phrases) {
        formatter.format("%n %s", ++number, phrase);
        System.out.println(charBuf.position());
        System.out.println(charBuf.limit());
        System.out.println(charBuf.capacity());
        charBuf.flip();
        System.out.println(charBuf.position());
        System.out.println(charBuf.limit());
        System.out.println(charBuf.length());
        buf.limit(2 * charBuf.length()); // Set byte buffer limit
        System.out.println(buf.position());
        System.out.println(buf.limit());
        System.out.println(buf.remaining());
        try {
            outChannel.write(buf);
            buf.clear();
            charBuf.clear();
        } catch (IOException e) {
            e.printStackTrace(System.err);
        }
    }
    try {
        outputFile.close();
    } catch (IOException e) {
        e.printStackTrace(System.err);
    }
}

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From source file:GetWebPageApp.java

public static void main(String args[]) throws Exception {
    String resource, host, file;//from   w ww  . ja va 2s.co 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.compomics.colims.core.util.AccessionConverter.java

/**
 * fetches the html page at the passed url as a string
 *
 * @param aUrl the url to fetch the html page from
 * @return the page at the url in textual form
 * @throws IOException/*  w w  w . j ava 2  s .  co  m*/
 */
public static String getPage(String aUrl) throws IOException {
    StringBuilder input = new StringBuilder();
    String htmlPage;
    try (Reader r = openReader(aUrl)) {
        CharBuffer buffer = CharBuffer.allocate(256);
        while ((r.read(buffer)) != -1) {
            input.append(buffer.flip());
            buffer.clear();
        }
    } catch (IOException e) {
        throw new IOException("EMBL-EBI server is not available at the moment, please try again later.");
    }
    htmlPage = input.toString();
    return htmlPage;
}

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

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

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

public static void writeChunk(CharBuffer cb, String outputFile) throws IOException {
    cb.flip();//from  w ww . jav  a 2s .  co m
    try (BufferedWriter bw = new BufferedWriter(new PrintWriter(outputFile))) {
        bw.write(cb.toString());
        cb.clear();
    }
}

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