来自剪贴板的图像未在JavaFX 8应用程序中正确显示 [英] Image from clipboard not correctly displayed in JavaFX 8 application

问题描述

此程序应将剪贴板中的图像粘贴到ImageView中(在Windows 10上).不幸的是，图像无法正确显示.

This program shall paste an image from clipboard into an ImageView (on Windows 10). Unfortunately the image is not correctly displayed.

public class PasteImageFromClipboard extends Application {

ImageView imageView = new ImageView();
Button bnPaste = new Button("Paste");

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

@Override
public void start(Stage stage) throws Exception {

    bnPaste.setOnAction(new EventHandler<ActionEvent>() {
        public void handle(ActionEvent event) {
            Clipboard cb = Clipboard.getSystemClipboard();
            if (cb.hasImage()) {
                Image image = cb.getImage();
                imageView.setImage(image);
            }
        }
    });

    VBox vbox = new VBox();
    vbox.getChildren().addAll(bnPaste, imageView);
    Scene scene = new Scene(vbox);
    stage.setScene(scene);
    stage.setWidth(400);
    stage.setHeight(400);
    stage.show();
}
}

复制步骤:

• 启动cmd.exe
• 按ALT-Print键将cmd窗口复制到剪贴板中
• 启动程序PasteImageFromClipboard
• 在PasteImageFromClipboard中按粘贴"按钮

此结果显示在我的计算机上:

This result is displayed on my computer:

应该是这样的:

是否需要更多代码才能正确绘制图像?

Is there more code required to draw the image correctly?

推荐答案

借助 https://community.oracle.com/thread/2238566

    package com.wilutions.jiraddin;

    import java.awt.Graphics;
    import java.awt.Toolkit;
    import java.awt.datatransfer.DataFlavor;
    import java.awt.datatransfer.Transferable;
    import java.awt.image.BufferedImage;
    import java.awt.image.RenderedImage;
    import java.io.ByteArrayInputStream;
    import java.io.ByteArrayOutputStream;

    import javax.imageio.ImageIO;

    import javafx.application.Application;
    import javafx.event.ActionEvent;
    import javafx.event.EventHandler;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.image.ImageView;
    import javafx.scene.layout.VBox;
    import javafx.stage.Stage;

    public class PasteImageFromClipboard extends Application {

        ImageView imageView = new ImageView();
        Button bnPaste = new Button("Paste");

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

        @Override
        public void start(Stage stage) throws Exception {

            bnPaste.setOnAction(new EventHandler<ActionEvent>() {
                public void handle(ActionEvent event) {
                    try {
                        java.awt.Image image = getImageFromClipboard();
                        if (image != null) {
                            javafx.scene.image.Image fimage = awtImageToFX(image);
                            imageView.setImage(fimage);
                        }
                    }
                    catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });

            VBox vbox = new VBox();
            vbox.getChildren().addAll(bnPaste, imageView);
            Scene scene = new Scene(vbox);
            stage.setScene(scene);
            stage.setWidth(400);
            stage.setHeight(400);
            stage.show();
        }

        private java.awt.Image getImageFromClipboard() {
            Transferable transferable = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
            if (transferable != null && transferable.isDataFlavorSupported(DataFlavor.imageFlavor)) {
                try {
                    return (java.awt.Image) transferable.getTransferData(DataFlavor.imageFlavor);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return null;
        }

        private static javafx.scene.image.Image awtImageToFX(java.awt.Image image) throws Exception {
            if (!(image instanceof RenderedImage)) {
                BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null),
                        BufferedImage.TYPE_INT_ARGB);
                Graphics g = bufferedImage.createGraphics();
                g.drawImage(image, 0, 0, null);
                g.dispose();

                image = bufferedImage;
            }
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write((RenderedImage) image, "png", out);
            out.flush();
            ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
            return new javafx.scene.image.Image(in);
        }

    }

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