Example usage for java.nio ByteBuffer allocate

List of usage examples for java.nio ByteBuffer allocate

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Introduction

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

Prototype

public static ByteBuffer allocate(int capacity)

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

From source file:com.talent.nio.communicate.receive.DecodeRunnable.java

/**
 * @param args//from   w w  w .j  a v a2 s .  c om
 */
public static void main(String[] args) {
    byte[] bs1 = new byte[] { 1, 10, 11, 12 };
    byte[] bs2 = new byte[] { 2, 2, 2, 2 };
    byte[] bs3 = new byte[] { 3, 3, 3, 3 };
    byte[] bs4 = new byte[] { 4, 4, 4, 4 };
    byte[] bs5 = new byte[] { 5, 5, 5, 5 };
    byte[] bs6 = new byte[] { 6, 6, 6, 6 };

    ByteBuffer buffer1 = ByteBuffer.allocate(1024);
    buffer1.put(bs1);
    buffer1.flip();

    ByteBuf buf1 = Unpooled.copiedBuffer(buffer1);// .copiedBuffer(bs1);

    buffer1.put(bs3);

    ByteBuf buf2 = Unpooled.copiedBuffer(bs2);
    ByteBuf buf3 = Unpooled.copiedBuffer(bs3);
    ByteBuf buf4 = Unpooled.copiedBuffer(bs4);
    ByteBuf buf5 = Unpooled.copiedBuffer(bs5);
    ByteBuf buf6 = Unpooled.copiedBuffer(bs6);

    CompositeByteBuf cb = Unpooled.compositeBuffer();
    cb.addComponents(buf1, buf2, buf3);

    byte dd = cb.getByte(0);

    CompositeByteBuf cb2 = Unpooled.compositeBuffer();
    cb.addComponents(buf4, buf5, buf6);

    // cb.c
    // cb2.writerIndex(128 * 1024);

    cb.addComponent(cb2);

    Long number = cb2.readLong(); // causes IllegalBufferAccessException
                                  // here!

}

From source file:Main.java

public static String processRead(SelectionKey key) throws Exception {
    SocketChannel sChannel = (SocketChannel) key.channel();
    ByteBuffer buffer = ByteBuffer.allocate(1024);
    sChannel.read(buffer);/*ww w. ja  va  2 s  . co  m*/
    buffer.flip();
    Charset charset = Charset.forName("UTF-8");
    CharsetDecoder decoder = charset.newDecoder();
    CharBuffer charBuffer = decoder.decode(buffer);
    String msg = charBuffer.toString();
    return msg;
}

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

/**
 * ?//from ww w.j  a v  a 2  s.com
 *
 * @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.offbynull.portmapper.common.ByteBufferUtils.java

/**
 * Copy the remaining content of a {@link ByteBuffer} in to a new array.
 * @param src buffer to copy//from   w w w.ja  v  a2s  . c om
 * @param incrementSrc of {@code true} increments {@code src}'s position
 * @return new buffer with the remaining content in {@code src}
 * @throws NullPointerException if any arguments are {@code null}
 */
public static byte[] copyContentsToArray(ByteBuffer src, boolean incrementSrc) {
    Validate.notNull(src);
    if (!incrementSrc) {
        src.mark();
    }

    ByteBuffer dst = ByteBuffer.allocate(src.remaining());
    dst.put(src);

    if (!incrementSrc) {
        src.reset();
    }

    return dst.array();
}

From source file:crocserver.app.CrocSecurity.java

private static byte[] toByteArray(long value) {
    ByteBuffer buffer = ByteBuffer.allocate(8);
    buffer.putLong(value);/*  www . ja va2 s . c o m*/
    return buffer.array();
}

From source file:de.rwhq.serializer.FixedStringSerializer.java

@Override
public byte[] serialize(final String o) {
    final byte[] bytes = o.getBytes();

    if (bytes.length > (length - 1)) {
        throw new IllegalArgumentException("String is too long to be serialized");
    }//  w w w . ja va 2 s. c om

    final ByteBuffer buf = ByteBuffer.allocate(length);
    buf.putShort((short) bytes.length);
    buf.put(bytes);
    return buf.array();
}

From source file:com.datatorrent.contrib.hdht.HDHTDynamicPartitioningTest.java

static Slice getLongByteArray(long key) {
    ByteBuffer bb = ByteBuffer.allocate(8);
    bb.putLong(key);
    return new Slice(bb.array());
}

From source file:com.github.neoio.net.message.staging.memory.TestMemoryMessageStaging.java

@Test
public void test_tempRead() {
    ByteBuffer buffer = ByteBuffer.allocate(1024);

    buffer.put("Hello World".getBytes());
    buffer.rewind();/*from  w  w  w  . java  2 s.c om*/
    staging.writeTempReadBytes(buffer);
    Assert.assertTrue(staging.hasTempReadBytes());

    buffer.clear();
    staging.readTempReadBytes(buffer);
    Assert.assertEquals("Hello World",
            new String(ArrayUtils.subarray(buffer.array(), 0, "Hello World".getBytes().length)));
    staging.resetTempReadBytes();

    Assert.assertFalse(staging.hasTempReadBytes());
}

From source file:com.aerohive.nms.engine.admin.task.licensemgr.license.processor2.PacketUtil.java

public static byte[] join(Header header, byte[] content) {
    ByteBuffer buf = ByteBuffer.allocate(8192);

    byte[] outBytes;
    if (content.length == 0) {
        outBytes = new byte[0];
    } else {/*from   w w w.  ja v a2s.com*/
        if (header.isSecretFlag()) {
            // encrypt data
            outBytes = encryptData(content);
        } else {
            outBytes = new byte[content.length];
            System.arraycopy(content, 0, outBytes, 0, content.length);
        }
    }
    buf.put(header.getType());
    buf.putInt(outBytes.length);
    buf.put(header.getProtocolVersion());
    buf.put(header.isSecretFlag() ? CommConst.Secret_Flag_Yes : CommConst.Secret_Flag_No);
    buf.put(outBytes);

    buf.flip();

    byte[] dst = new byte[buf.limit()];
    buf.get(dst);
    return dst;
}

From source file:Main.java

public static final ByteBuffer borrowByteBuffer(final int capacity) {
    if (capacity >= MAX_LINE_BYTES_VERY_LARGE) {
        return ByteBuffer.allocate(capacity);
    } else if (capacity >= MAX_LINE_BYTES_LARGE) {
        return borrowByteBufferVeryLarge();
    } else if (capacity >= MAX_LINE_BYTES_MEDIUM) {
        return borrowByteBufferLarge();
    } else if (capacity >= MAX_LINE_BYTES_NORMAL) {
        return borrowByteBufferMedium();
    } else if (capacity >= MAX_LINE_BYTES_SMALL) {
        return borrowByteBufferNormal();
    } else {//from  w  ww .  java  2  s  .com
        return borrowByteBufferSmall();
    }
}