Read and write with SocketChannel

import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
/*  j  ava  2s . c o m*/
public class Main {
  public static void main(String[] argv) throws Exception {
    ByteBuffer buf = ByteBuffer.allocateDirect(1024);
    SocketChannel sChannel = SocketChannel.open();
    sChannel.configureBlocking(false);
    sChannel.connect(new InetSocketAddress("hostName", 12345));

    int numBytesRead = sChannel.read(buf);

    if (numBytesRead == -1) {
      sChannel.close();
    } else {
      buf.flip();
    }
  }
}

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
/*from j  a  v  a2 s.c  om*/
public class Main {
  public static void main(String[] argv) throws Exception {
    SocketChannel sChannel = SocketChannel.open();
    sChannel.configureBlocking(false);
    sChannel.connect(new InetSocketAddress("hostName", 12345));

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

    buf.flip();

    int numBytesWritten = sChannel.write(buf);
  }
}