java - 为什么在尝试将 css 与 javafx 结合使用时会出现 InvocationTargetException？

Question

我是 javafx 的新手，我正在尝试将我的类连接到我的 CSS 文件，但是当我使用时:

scene.getStylesheets().add("Viper.css");

我收到以下警告:

Dec 08, 2016 9:12:54 PM com.sun.javafx.css.StyleManager loadStylesheetUnPrivileged
WARNING: Resource "Viper.css" not found.

但是当我使用时:

scene.getStylesheets().add(getClass().getResource("/resources/CSS/Viper.css").toExternalForm());

我得到一个 InvocationTargetException

这是我的整个类(class)，我确信文件路径是正确的。我正在使用 NetBeans IDE。

package com.GUI;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Pane;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.stage.Stage;


public class window extends Application{


    @Override
    public void start(Stage primaryStage) {

        primaryStage.setTitle("OmegaBrain");

        //Create Panes
        Pane titlePane = new Pane();


        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(25, 25, 25, 25));

        Text sceneTitle = new Text("Welcome To OmegaBrain");
        sceneTitle.setFont(Font.font("Helvetica", FontWeight.NORMAL, 20));
        grid.add(sceneTitle, 0, 0, 4, 1);



        Scene scene = new Scene(grid, 300, 275);
        scene.getStylesheets().add("/resources/CSS/Viper.css");


        primaryStage.setScene(scene);
        primaryStage.show();


        Button play = new Button("Play");
        grid.add(play, 1, 1);

        Button leaderboard = new Button("Leaderboard");
        grid.add(leaderboard, 2, 1);

        Button faq = new Button("FAQs");
        grid.add(faq, 3, 1);

        Button exit = new Button("Exit");
        grid.add(exit, 4, 1);


        play.setOnAction((ActionEvent e) -> {
         System.out.println("The play button was clicked!");
        });



    }


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



}

Answer 1

假设您的应用程序是使用此层次结构构建的:

应用程序
->源文件
-->com/GUI/window.java
-->资源/CSS/Viper.css

那么这段代码应该可以工作了:

scene.getStylesheets().add(getClass().getResource("/resources/CSS/Viper.css").toExternalForm());
// or
scene.getStylesheets().add("/resources/CSS/Viper.css");