“java.lang.IllegalArgumentException：uri.getScheme（）== null！ “使用JavaFX播放音频时出错

我正在尝试在Java上播放mp3音频，其中一种forms。 我相信是JavaFX，一切顺​​利，直到我尝试播放音频。

这是代码：

import javax.sound.sampled.AudioPermission; import javafx.application.Application; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.StackPane; import javafx.scene.media.Media; import javafx.scene.media.MediaPlayer; import javafx.stage.Stage; public class fx_main extends Application { @Override public void start(Stage primaryStage) { Button btn = new Button(); btn.setText("Say 'Hello World'"); btn.setOnAction(new EventHandler() { @Override public void handle(ActionEvent event) { System.out.println("Hello World!"); Media m = new Media("/04.mp3"); MediaPlayer mp = new MediaPlayer(m); mp.play(); } }); StackPane root = new StackPane(); root.getChildren().add(btn); Scene scene = new Scene(root, 300, 250); primaryStage.setTitle("Hello World!"); primaryStage.setScene(scene); primaryStage.show(); } public static void main(String[] args) { launch(args); } } 

当我按下按钮并尝试加载声音文件时，出现此exception：

  Hello World! Glass detected outstanding Java exception at -[GlassViewDelegate sendJavaMouseEvent:]:src/com/sun/mat/ui/GlassViewDelegate.m:543 Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: uri.getScheme() == null! at com.sun.media.jfxmedia.locator.Locator.(Locator.java:217) at javafx.scene.media.Media.(Media.java:369) at fx_man$1.handle(fx_man.java:27) at fx_man$1.handle(fx_man.java:1) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28) at javafx.event.Event.fireEvent(Event.java:171) at javafx.scene.Node.fireEvent(Node.java:6866) at javafx.scene.control.Button.fire(Button.java:179) at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:193) at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:336) at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:329) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:64) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33) at javafx.event.Event.fireEvent(Event.java:171) at javafx.scene.Scene$MouseHandler.process(Scene.java:3369) at javafx.scene.Scene$MouseHandler.process(Scene.java:3209) at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3164) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1582) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2267) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:250) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:173) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:292) at com.sun.glass.ui.View.handleMouseEvent(View.java:530) at com.sun.glass.ui.View.notifyMouse(View. java:924) 

我该如何修复错误？ 我点击时想播放音频文件？

Answer 1

Media的构造函数需要一个URL，所以你需要一些以http：//或file：//开头的东西

 btn.setOnAction(e -> { Media m = new Media(Paths.get("04.mp3").toUri().toString()); new MediaPlayer(m).play(); });` 

见http://docs.oracle.com/javase/8/javafx/media-tutorial/simpleplayer.htm

它还有助于Path和File对象都可以转换为URL。