Server.java

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;

public class Server {

  private static ServerSocket listener;

  public static void main(String[] args) throws Exception {
    try {
      Utils utils = new Utils();
      //IP address
      String serverAddress = utils.getIp();
      // Server Port
      int serverPort = utils.getPort();

      // Create connection between client and server
      listener = new ServerSocket();
      listener.setReuseAddress(true);
      InetAddress serverIp = InetAddress.getByName(serverAddress);
      // Assign to listener the IP address to listen to and port
      listener.bind(new InetSocketAddress(serverIp, serverPort));
      System.out.println(
        "Server is running : at " + serverAddress + " Port " + serverPort
      );
      try {
        while (true) {
          new ClientHandler(listener.accept(), utils).start();
        }
      } finally {
        listener.close();
      }
    } catch (Exception e) {
      System.out.println("Error while exiting.");
    }
  }
}