[Ch15] DailyAdviceServer while loop is now dependent upon the server being open.

import java.io.IOException;

import java.io.PrintWriter;

import java.net.InetSocketAddress;

import java.net.ServerSocket;

import java.net.Socket;

import java.nio.channels.Channels;

import java.nio.channels.ServerSocketChannel;

import java.nio.channels.SocketChannel;

  public void go() {

    try {

      ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

      serverSocketChannel.bind(new InetSocketAddress("localhost", 4242));

      ServerSocketChannel serverChannel = ServerSocketChannel.open();

      serverChannel.bind(new InetSocketAddress("localhost", 4242));

      while (true) {

        SocketChannel sock = serverSocketChannel.accept();

      while (serverChannel.isOpen()) {

        SocketChannel clientChannel = serverChannel.accept();

        PrintWriter writer = new PrintWriter(Channels.newOutputStream(sock));

        PrintWriter writer = new PrintWriter(Channels.newOutputStream(clientChannel));

        String advice = getAdvice();

        writer.println(advice);

        writer.close();