如何正确禁用按钮

有一个断开按钮。点击之后，当前的InputStream和OutputStream都关闭了，服务端和客户端的连接断开了。问题是如何组织禁用按钮，使其仅在客户端连接到服务器时才处于活动状态？附上控制器和套接字代码。

控制器：包装样品；

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;

import java.io.IOException;

public class Controller
{
@FXML
TextField myTextField;

@FXML
Button buttonOff;



public void myBreakСonnection(ActionEvent event)
{
    try {
        MySocket.inputStream.close();
        MySocket.outputStream.close();
        buttonOff.disabledProperty();
    } catch (IOException e) {
        e.printStackTrace();
    }
}


}

主要的：

try
{
  s = new ServerSocket(8189);
  try(Socket incoming = s.accept())
        {
            boolean key = MySocket.s.isClosed();
            System.out.println(key);

             inputStream = incoming.getInputStream();
             outputStream = incoming.getOutputStream();

            try(Scanner in = new Scanner(inputStream))
            {
                PrintWriter out = new PrintWriter(outputStream, true);
                out.println("Hello! Enter BYE to exit.");

                boolean done = false;
                while(!done && in.hasNextLine())
                {
                    String line = in.nextLine();
                    out.println("Echo: " + line);
                    if(line.trim().equals("BYE")) done = true;
                }
            }


        }

不相关的问题，例如多线程中的静态等，请不要提出。