java.lang.IllegalArgumentException: URL hoặc tài nguyên không hợp lệ không tìm thấy

Question

Tôi thử mã này:

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(); 
    } 

tôi nhận được lỗi này:

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) 

tôi đặt các tập tin hình ảnh bên cạnh các mã nguồn java nhưng không tìm thấy tệp. Bạn có thể cho tôi biết cách sửa lỗi này không?

Answer 1

Do

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

Hoặc đơn giản là

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

Answer 2

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

Các constructor này cần để trỏ đến một URI, vì vậy nó sẽ là:

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

Ngoài ra, bạn có thể làm:

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

Hầu hết các phương pháp/nhà thầu trong JavaFX mà lấy một chuỗi như một tham số theo cách này (tức là chỉ định một tài nguyên) làm như vậy thông qua chuỗi URI thay vì chỉ là một đường dẫn tệp hoặc URL đơn giản.