ServerSocketChannel

import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
/*from   j  a va2s.co  m*/
public class MainClass {

  public final static int PORT = 2345;

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

    ServerSocketChannel serverChannel = ServerSocketChannel.open();
    SocketAddress port = new InetSocketAddress(PORT);
    serverChannel.socket().bind(port);

    while (true) {
      SocketChannel clientChannel = serverChannel.accept();

      String response = "Hello " + clientChannel.socket().getInetAddress() + " on port "
          + clientChannel.socket().getPort() + "\r\n";
      response += "This is " + serverChannel.socket() + " on port "
          + serverChannel.socket().getLocalPort() + "\r\n";

      byte[] data = response.getBytes("UTF-8");
      ByteBuffer buffer = ByteBuffer.wrap(data);
      while (buffer.hasRemaining())
        clientChannel.write(buffer);
      clientChannel.close();
    }
  }
}

import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
//ja  v  a 2  s. com
public class Main {
  public static void main(String[] argv) throws Exception {
    ServerSocketChannel ssChannel = ServerSocketChannel.open();
    ssChannel.configureBlocking(false);
    int port = 80;
    ssChannel.socket().bind(new InetSocketAddress(port));
    int localPort = ssChannel.socket().getLocalPort();

    SocketChannel sChannel = ssChannel.accept();

    if (sChannel == null) {
    } else {
    }
  }
}

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
/*  ja va 2  s  .  c  o m*/

public class MainClass {
  public static final String GREETING = "Hello I must be going.\r\n";

  public static void main(String[] argv) throws Exception {
    int port = 1234; // default

    ByteBuffer buffer = ByteBuffer.wrap(GREETING.getBytes());
    ServerSocketChannel ssc = ServerSocketChannel.open();

    ssc.socket().bind(new InetSocketAddress(port));
    ssc.configureBlocking(false);

    while (true) {
      System.out.println("Waiting for connections");

      SocketChannel sc = ssc.accept();

      if (sc == null) {
        Thread.sleep(2000);
      } else {
        System.out.println("Incoming connection from: " + sc.socket().getRemoteSocketAddress());

        buffer.rewind();
        sc.write(buffer);
        sc.close();
      }
    }
  }
}