java - JavaFX 中的媒体播放器

Question

我担心自本教程发布以来 JavaFX 已经经历了一些修改:http://www.youtube.com/watch?v=bWl98dhvf8Q 。

请给我一些提示，告诉我应该在此代码中更改哪些内容，或者这种代码是否有效？谢谢。

代码如下:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.scene.Group;


public class BiPlayer extends Application {

    public static void main(String[] args){

        launch(args);

    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Group videoPane = new Group();

        Media media = new Media("C:\\Users\\Insanovation\\Downloads\\P.mp4");
        MediaPlayer player = new MediaPlayer(media);
        MediaView view = new MediaView(player);

        videoPane.getChildren().add(view);
        Scene scene = new Scene (videoPane, 400, 400, Color.BLACK);
        primaryStage.setScene(scene);
        primaryStage.show();

        player.play();
    }
}

这是输出:

    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:483)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303)
    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:483)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$147(LauncherImpl.java:157)
    at com.sun.javafx.application.LauncherImpl$$Lambda$48/1394438858.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: java.net.URISyntaxException: Illegal character in opaque part at index 2: C:\Users\Insanovation\Downloads\F.mp3
    at javafx.scene.media.Media.<init>(Media.java:383)
    at biplayer.BiPLAYER.start(BiPLAYER.java:24)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
    at com.sun.javafx.application.LauncherImpl$$Lambda$51/270894642.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
    at com.sun.javafx.application.PlatformImpl$$Lambda$44/1147985808.run(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
    at com.sun.javafx.application.PlatformImpl$$Lambda$47/1822121612.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
    at com.sun.javafx.application.PlatformImpl$$Lambda$45/1267032364.run(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
    at com.sun.glass.ui.win.WinApplication$$Lambda$37/636718812.run(Unknown Source)
    ... 1 more
Caused by: java.net.URISyntaxException: Illegal character in opaque part at index 2: C:\Users\Insanovation\Downloads\F.mp3
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.checkChars(URI.java:3021)
    at java.net.URI$Parser.parse(URI.java:3058)
    at java.net.URI.<init>(URI.java:588)
    at javafx.scene.media.Media.<init>(Media.java:381)
    ... 15 more
Exception running application biplayer.BiPLAYER
Java Result: 1

Answer 1

查看您复制并粘贴的异常，很明显抛出的异常是 URISyntaxException。然后它列出了有问题的字符，该字符位于索引 2(反斜杠字符)处。

如果您查看 URI 的文档 here和 here ，您将看到 URI 中只接受正斜杠。如果您将路径中的反斜杠更改为正斜杠，如下所示:

file:C:/Users/Insanovation/Downloads/F.mp4

我相信它应该有效。