Using command line arguments in Java with JavaFX

I have the following code:

public class Main extends Application {

  @Override
  public void start(Stage primaryStage) throws Exception{
      Parent root = FXMLLoader.load(getClass().getResource("hive.fxml"));
      primaryStage.setTitle("Hive-viewer");
      primaryStage.setScene(new Scene(root, 1600, 900));
      primaryStage.show();
  }


  public static void main(String[] args) {
      launch(args);
  }
}

I want to know how you would use a file (given with the command line) in the Controller or in a method in the Main class