Reading from InputStream

Lately I've faced a simple problem: I needed to read all bytes from the InputStream. I didn't know type of the InputStream, so, I've spent more then two hours solving this problem without any success. I didn't want to read each byte from the stream. All evening I could think only about this problem. Solution turned to be very simple! I found a sample in the JDK installation directory($JAVA_HOME/sample/nio/). JDK 1.5(and higher) is a good API to work with streams over channels. The source code to read all bytes from the InputStream is rather simple:

 
private static final int READ_BLOCK = 8192; //Block size that we want to read in one time.

private ByteBuffer resizeBuffer(ByteBuffer in) {
    ByteBuffer result = in;
    if (in.remaining() < READ_BLOCK) {
        result = ByteBuffer.allocate(in.capacity() * 2); //create new buffer
        in.flip(); //set limit to current position in buffer and set position to zero.
        result.put(in); //put original buffer to new buffer
    }

    return result;
}

private byte[] readAllFromInputStream(InputStream is) throws IOException {
    ReadableByteChannel bc = Channels.newChannel(is); //create channel for input stream
    ByteBuffer bb = ByteBuffer.allocate(READ_BLOCK);

    while (bc.read(bb) != -1) {
        bb = resizeBuffer(bb); //get new buffer for read
    }
    bb.flip();
    return bb.array();
}

Also I found an interesting book in which you can read about the nio package: get it here