java.lang.IllegalArgumentException: Nieprawidłowy URL lub zasób nie znaleziono

Question

testowałem ten kod:

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

    @Override 
    public void start(Stage primaryStage) 
    { 

     // Image 
     Image image = new Image("za.png"); 
     ImageView imageView = new ImageView(); 
     imageView.setImage(image); 

     // Text 
     Text t = new Text(); 
     t.setText("Do you want to quit?"); 

     // Buttons 
     Button btnYes = new Button("Yes"); 
     Button btnNo = new Button("No"); 
     btnYes.setStyle("-fx-background-color:\n" 
       + "  #090a0c,\n" 
       + "  linear-gradient(#38424b 0%, #1f2429 20%, #191d22 100%),\n" 
       + "  linear-gradient(#20262b, #191d22),\n" 
       + "  radial-gradient(center 50% 0%, radius 100%, rgba(114,131,148,0.9), rgba(255,255,255,0));\n" 
       + " -fx-background-radius: 5,4,3,5;\n" 
       + " -fx-background-insets: 0,1,2,0;\n" 
       + " -fx-text-fill: white;\n" 
       + " -fx-effect: dropshadow(three-pass-box , rgba(0,0,0,0.6) , 5, 0.0 , 0 , 1);\n" 
       + " -fx-font-family: \"Arial\";\n" 
       + " -fx-text-fill: linear-gradient(white, #d0d0d0);\n" 
       + " -fx-font-size: 12px;\n" 
       + " -fx-padding: 10 20 10 20;"); 

     btnNo.setStyle("-fx-background-color:\n" 
       + "  #090a0c,\n" 
       + "  linear-gradient(#38424b 0%, #1f2429 20%, #191d22 100%),\n" 
       + "  linear-gradient(#20262b, #191d22),\n" 
       + "  radial-gradient(center 50% 0%, radius 100%, rgba(114,131,148,0.9), rgba(255,255,255,0));\n" 
       + " -fx-background-radius: 5,4,3,5;\n" 
       + " -fx-background-insets: 0,1,2,0;\n" 
       + " -fx-text-fill: white;\n" 
       + " -fx-effect: dropshadow(three-pass-box , rgba(0,0,0,0.6) , 5, 0.0 , 0 , 1);\n" 
       + " -fx-font-family: \"Arial\";\n" 
       + " -fx-text-fill: linear-gradient(white, #d0d0d0);\n" 
       + " -fx-font-size: 12px;\n" 
       + " -fx-padding: 10 20 10 20;"); 

     // Buttons layout 
     HBox hbox = new HBox(8); // spacing = 8 
     hbox.setStyle("-fx-padding: 15; -fx-font-size: 15pt;"); 
     hbox.getChildren().addAll(btnYes, btnNo); 
     hbox.setAlignment(Pos.BASELINE_RIGHT); 

     BorderPane bp = new BorderPane(); 
     bp.setStyle("-fx-background-color: linear-gradient(#ffffff,#f3f3f4);\n" 
       + " -fx-border-width: 1 1 1 1;\n" 
       + " -fx-border-color: #b4b4b4 transparent #b4b4b4 transparent;\n" 
       + " -fx-font-size: 1.083333em;\n" 
       + " -fx-text-fill: #292929;"); 

     bp.setPadding(new Insets(10, 20, 10, 20)); 
     //Button btnTop = new Button("Top"); 
     bp.setTop(null); 
     //Button btnLeft = new Button("Left"); 
     bp.setLeft(imageView); 
     //Button btnCenter = new Button("Center"); 
     bp.setCenter(t); 
     //Button btnRight = new Button("Right"); 
     bp.setRight(null); 
     //Button btnBottom = new Button("Bottom"); 
     bp.setBottom(hbox); 
     Scene scene = new Scene(bp, 500, 200); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

otrzymuję ten błąd:

Executing com.javafx.main.Main from /home/rcbandit/Desktop/test/DX-57DC/dist/run429319394/DX-57DC.jar using platform /opt/jdk1.8.0/bin/java 
Exception in Application start method 
java.lang.reflect.InvocationTargetException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:491) 
    at com.javafx.main.Main.launchApp(Main.java:642) 
    at com.javafx.main.Main.main(Main.java:805) 
Caused by: java.lang.RuntimeException: Exception in Application start method 
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403) 
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47) 
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115) 
    at java.lang.Thread.run(Thread.java:724) 
Caused by: java.lang.IllegalArgumentException: Invalid URL: Invalid URL or resource not found 
    at javafx.scene.image.Image.validateUrl(Image.java:986) 
    at javafx.scene.image.Image.<init>(Image.java:538) 
    at com.dx57dc.main.DX57DC.start(DX57DC.java:28) 
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319) 
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:215) 
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179) 
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176) 
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76) 
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) 
    at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:82) 
    ... 1 more 
Caused by: java.lang.IllegalArgumentException: Invalid URL or resource not found 
    at javafx.scene.image.Image.validateUrl(Image.java:979) 
    ... 12 more 
Java Result: 1 
Deleting directory /home/rcbandit/Desktop/test/DX-57DC/dist/run429319394 
jfxsa-run: 
BUILD SUCCESSFUL (total time: 6 seconds) 

umieściłem plik obrazu obok kodu źródłowego Javy plik, ale plik nie zostanie znaleziony. Czy możesz mi powiedzieć, jak to naprawić?

Answer 1

Czy

javafx.scene.image.Image image = new javafx.scene.image.Image(getClass().getResource("za.jpg").toExternalForm()); 
ImageView iv = new ImageView(image); 

Albo po prostu

ImageView iv = new ImageView(getClass().getResource("za.jpg").toExternalForm()); 

Answer 2

Image image = new Image("za.png"); 

Konstruktor ten musi wskazywać na URI, więc byłoby:

Image image = new Image("file:za.png"); 

Alternatywnie, można zrobić:

Image image = new Image(new File("za.png").toURI().toString()); 

większości metod/konstruktorów w JavaFX które przyjmują łańcuch jako parametr w ten sposób (tj. określając zasób) robią to za pomocą identyfikatorów URI ciągu, a nie tylko zwykłej ścieżki pliku lub adresu URL.