Example usage for java.nio.channels ReadableByteChannel read

Introduction

In this page you can find the example usage for java.nio.channels ReadableByteChannel read.

Prototype

public int read(ByteBuffer dst) throws IOException;

Source Link

Document

Reads a sequence of bytes from this channel into the given buffer.

Usage

From source file:Main.java

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

    FileInputStream fin = new FileInputStream(args[0]);
    GZIPInputStream gzin = new GZIPInputStream(fin);
    ReadableByteChannel in = Channels.newChannel(gzin);

    WritableByteChannel out = Channels.newChannel(System.out);
    ByteBuffer buffer = ByteBuffer.allocate(65536);
    while (in.read(buffer) != -1) {
        buffer.flip();//from  w  w  w  .j  a  v a 2 s. com
        out.write(buffer);
        buffer.clear();
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();/*from w w w  .  j  av  a  2 s  . c o m*/

        numRead = channel.read(buf);

        buf.rewind();

        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();//  w w  w. j  av  a 2  s .co  m

        numRead = channel.read(buf);

        buf.rewind();

        // Read bytes from ByteBuffer; see also
        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReadableByteChannel channel = new FileInputStream("infile.dat").getChannel();

    ByteBuffer buf = ByteBuffer.allocateDirect(10);

    int numRead = 0;
    while (numRead >= 0) {
        buf.rewind();//w  w w  . j a  v a2s. co m

        numRead = channel.read(buf);

        buf.rewind();

        for (int i = 0; i < numRead; i++) {
            byte b = buf.get();
        }
    }
}

From source file:com.eatnumber1.util.io.IOUtils.java

public static void read(@NotNull ReadableByteChannel channel, @NotNull ByteBuffer dst, int expected)
        throws IOException {
    if (channel.read(dst) != expected)
        throw new IOException("Did not read expected amount of data");
}

From source file:Main.java

public static void copy(ReadableByteChannel src, WritableByteChannel dest) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocateDirect(CAPACITY);
    while (src.read(buffer) != -1) {
        buffer.flip();//from  w ww  .ja  v  a 2s.com
        dest.write(buffer);
        buffer.compact();
    }

    buffer.flip();

    while (buffer.hasRemaining()) {
        dest.write(buffer);
    }
}

From source file:Main.java

public static void transfer(ReadableByteChannel in, WritableByteChannel out) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocate(4096);
    while (in.read(buffer) != -1) {
        buffer.flip();/*w  w w .java  2 s. co  m*/
        while (buffer.hasRemaining()) {
            out.write(buffer);
        }
        buffer.clear();
    }
}

From source file:Main.java

public static int readFully(final ReadableByteChannel channel, final ByteBuffer buf, final int length)
        throws IOException {
    int n, count = 0;
    while (-1 != (n = channel.read(buf))) {
        count += n;/*w  ww.j a va 2 s .c o m*/
        if (count == length) {
            break;
        }
    }
    if (n == -1) {
        throw new EOFException("End of file. No more boxes.");
    }
    return count;
}

From source file:Main.java

public static int readFully(ReadableByteChannel paramReadableByteChannel, ByteBuffer paramByteBuffer,
        int paramInt) throws IOException {
    int i = 0;/*from   w w w .ja v  a2  s. c o  m*/
    int j;
    do {
        j = paramReadableByteChannel.read(paramByteBuffer);
        if (-1 == j)
            break;
        i += j;
    } while (i != paramInt);
    if (j == -1)
        throw new EOFException("End of file. No more boxes.");
    return i;
}

From source file:Main.java

public static void fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
    while (src.read(buffer) != -1) {
        // prepare the buffer to be drained
        buffer.flip();//from w w  w. j  ava  2  s . c o  m
        // write to the channel, may block
        dest.write(buffer);
        // If partial transfer, shift remainder down
        // If buffer is empty, same as doing recycle()
        buffer.compact();
    }
    // EOF will leave buffer in fill state
    buffer.flip();
    // make sure the buffer is fully drained.
    while (buffer.hasRemaining()) {
        dest.write(buffer);
    }
}