java调用javafx,是否可以在Java应用程序中多次调用JavaFX应用程序？

As launch() cannot be called more than once, how do I call, say, a class

public class Graphs extends Application {

more than once? My program runs from a GUI and calls the JavaFX utility with Graph.launch(), and I would like to be able to call the program more than once. How can I do this?

解决方案

Assuming that you are using Swing in your Java application, to make use of JavaFX, you would not use the application class itself, but rather do the things you do in the Applications start method to construct a JavaFX scenegraph and embed this scene graph inside a Swing JFXPanel.

I made a small example:

import javafx.animation.FadeTransition;

import javafx.animation.RotateTransition;

import javafx.animation.Timeline;

import javafx.application.Platform;

import javafx.embed.swing.JFXPanel;

import javafx.scene.Scene;

import javafx.scene.layout.StackPane;

import javafx.scene.paint.Color;

import javafx.scene.shape.Rectangle;

import javafx.util.Duration;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Swing2Test extends JFrame {

public Swing2Test() {

setTitle("Simple example");

JPanel panel = new JPanel();

getContentPane().add(panel);

JButton button = new JButton("Show JavaFX Dialog");

button.setBounds(50, 60, 80, 30);

button.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent event) {

final JDialog dialog = new JDialog(Swing2Test.this,

"JavaFX Dialog",

true);

final JFXPanel contentPane = new JFXPanel();

dialog.setContentPane(contentPane);

dialog.setDefaultCloseOperation(

JDialog.HIDE_ON_CLOSE);

// building the scene graph must be done on the javafx thread

Platform.runLater(new Runnable() {

@Override

public void run() {

contentPane.setScene(createScene());

SwingUtilities.invokeLater(new Runnable() {

@Override

public void run() {

dialog.pack();

dialog.setVisible(true);

}

});

}

});

}

private Scene createScene() {

System.out.println("creating scene");

StackPane root = new StackPane();

Rectangle rect1 = new Rectangle(10, 10, 50, 50);

rect1.setFill(Color.BLUE);

Rectangle rect2 = new Rectangle(0, 0, 30, 30);

rect2.setFill(Color.ORANGE);

root.getChildren().addAll(rect1, rect2);

FadeTransition ft = new FadeTransition(Duration.millis(1800), rect1);

ft.setFromValue(1.0);

ft.setToValue(0.1);

ft.setCycleCount(Timeline.INDEFINITE);

ft.setAutoReverse(true);

ft.play();

RotateTransition rt = new RotateTransition(Duration.millis(1500), rect2);;

rt.setByAngle(180f);

rt.setCycleCount(Timeline.INDEFINITE);

rt.setAutoReverse(true);

rt.play();

return new Scene(root, 150, 150);

}

});

panel.add(button);

setSize(300, 200);

setLocationRelativeTo(null);

setDefaultCloseOperation(EXIT_ON_CLOSE);

}

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

@Override

public void run() {

Swing2Test ex = new Swing2Test();

ex.setVisible(true);

}

});

}

}