[Ch15] Updating server to use serversocketchannel

import java.io.IOException;

import java.io.PrintWriter;

import java.net.InetSocketAddress;

import java.net.ServerSocket;

import java.net.Socket;

import java.nio.ByteBuffer;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

public class DailyAdviceServer {

  public void go() {

    try {

      ServerSocket serverSock = new ServerSocket(4242);

      ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

      InetSocketAddress address = new InetSocketAddress("localhost", 4242);

      serverSocketChannel.bind(address);

      while (true) {

        Socket sock = serverSock.accept();

        SocketChannel socketChannel = serverSocketChannel.accept();

        PrintWriter writer = new PrintWriter(sock.getOutputStream());

        String advice = getAdvice();

        writer.println(advice);

        writer.close();

        byte[] message = advice.getBytes();

        ByteBuffer buffer = ByteBuffer.wrap(message);

        socketChannel.write(buffer);

        socketChannel.close();

        System.out.println(advice);

      }