javafx设置背景图片

javafx设置背景图片

使用css setstyle方式
但使用IntelliJ IDEA时,在写路径时会提示错误,但实际上是可以不管的
路径写项目的工作目录的相对路径即可

项目的路径如下:

├── pom.xml
├── src
│   ├── data
│   │   ├── Book_opened.png
│   │   ├── Book_opened.svg
│   │   └── illust_75942276_20200606_004558.jpg
│   ├── main
│   │   └── java
│   │       └── com
│   │           └── hjy
│   │               └── library
│   │                   ├── App.java
│   │                   ├── LoginStage.java
│   │                   ├── ManagerStage.java
│   │                   └── SQLPlugin.java
│   ├── style
│   │   ├── background.css
│   │   ├── background_test.css
│   │   └── test_css.html
│   └── test
│       └── java
│           └── com
│               └── hjy
│                   └── library
│                       └── AppTest.java

setsyle方式:

BorderPane backpane = new BorderPane();
backpane.setStyle("-fx-background-image: url(" + "file:src/data/illust_75942276_20200606_004558.jpg" + "); " +
                "-fx-background-position: center center; " +
                "-fx-background-repeat: stretch;" +
                "-fx-background-color:  transparent;");

错误的提示不用管

css文件方式[报错]:

这是在JavaFX How to set scene background image上抄的方法,但奈何无论怎么改图片的位置,改图片的相对/绝对路径,或者改成链接,都不管用

#pane{
    -fx-background-image: url(file:src/data/illust_75942276_20200606_004558.jpg);
    -fx-background-repeat: stretch;
    /*-fx-background-size: 900 506;*/
    -fx-background-position: center center;
    /*-fx-effect: dropshadow(three-pass-box, black, 30, 0.5, 0, 0);*/
}

StackPane stackPane = new StackPane();
stackPane.setId("pane");
Scene scene = new Scene(stackPane,600,400);
scene.getStylesheets().add(getClass().getResource("file:src/style/background.css").toExternalForm());

报错:

Exception in Application start method
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
	at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$412(LauncherImpl.java:182)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at com.hjy.library.LoginStage.<init>(LoginStage.java:54)
	at com.hjy.library.App.start(App.java:17)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$419(LauncherImpl.java:863)
	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$399(PlatformImpl.java:326)
	at com.sun.javafx.application.PlatformImpl.lambda$null$397(PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$398(PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at com.sun.glass.ui.gtk.GtkApplication.lambda$null$203(GtkApplication.java:139)
	... 1 more
Exception running application com.hjy.library.App