Q&A前提・実現したいこと
showOpenDialogから写真を読み込んでラベルに貼りたいのですが、どうしても上手くいきません･･･
この場合の対処を教えてください･･･
発生している問題・エラーメッセージ
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Input stream must not be null at javafx.scene.image.Image.validateInputStream(Image.java:1128) at javafx.scene.image.Image.<init>(Image.java:726) at saisyuukadai.date1$caMouseEventHandler.handle(date1.java:216) at saisyuukadai.date1$caMouseEventHandler.handle(date1.java:1) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at javafx.event.Event.fireEvent(Event.java:198) at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470) at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398) at javafx.scene.Scene$MouseHandler.process(Scene.java:3766) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431) at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at com.sun.glass.ui.View.notifyMouse(View.java:937) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177) at java.lang.Thread.run(Thread.java:748)
該当のソースコード
javafx
1 class caMouseEventHandler implements EventHandler<MouseEvent >{ 2 public void handle(MouseEvent eo) { 3 FileChooser fc = new FileChooser(); 4 File flo = fc.showOpenDialog(new Stage()); 5 Image im = new Image(getClass().getResourceAsStream(flo.getName()),350,350, true, true); 6 lb7.setGraphic(new ImageView(im)); 7 } 8 }
試したこと
getClass().getResourceAsStream(flo.getName())を用いて、写真を読み込むように組み立てました
補足情報（FW/ツールのバージョンなど）
jdk14
回答1件
0
自己解決
調査の結果、Javaのデータを保存している場所でないと画像を表示できないことが分かりました
投稿2021/02/04 15:06
総合スコア24
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