java - 如何从 JavaFX 应用程序的画布区域创建 PDF 或 SVG 文件？

Question

我想请你帮忙。

我正在尝试从 JavaFX 应用程序的画布区域创建 pdf 或 svg 文件。

PrinterJob.createPrinterJob()总是返回null。因为我没有在本地安装打印机。

我会很感激你的帮助。

标签： javajavafx

Answer 1

你需要 pdfbox 库https://archive.apache.org/dist/pdfbox/2.0.8/pdfbox-app-2.0.8.jar 将画布放在窗格节点中

package nodetopdf;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.SnapshotParameters;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Button;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javax.imageio.ImageIO;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;


public class NodeToPdf extends Application {

@Override
public void start(Stage primaryStage) {

 Button btn = new Button();
 btn.setTranslateY(100);
 btn.setText("To Pdf'");

Canvas canvas = new Canvas(200, 200);
 Pane pane = new Pane(canvas);

 Rectangle rectangle1 = new Rectangle(100, 50, Color.RED);

 pane.getChildren().addAll(rectangle1,btn);





btn.setOnAction(new EventHandler<ActionEvent>() {


    @Override
    public void handle(ActionEvent event) {
        System.out.println(" button pressed");
        WritableImage nodeshot = pane.snapshot(new SnapshotParameters(), 
 null);
        File file = new File("pane.png");

 try {
 ImageIO.write(SwingFXUtils.fromFXImage(nodeshot, null), "png", file);
 } catch (IOException e) {

 }

        PDDocument doc    = new PDDocument();
        PDPage page = new PDPage();
        PDImageXObject pdimage;
        PDPageContentStream content;
        try {
            pdimage = PDImageXObject.createFromFile("pane.png",doc);
            content = new PDPageContentStream(doc, page);
            content.drawImage(pdimage, 100, 100);
            content.close();
            doc.addPage(page);
            doc.save("pdf_file.pdf");
            doc.close();
            file.delete();
        } catch (IOException ex) {
            Logger.getLogger(NodeToPdf.class.getName()).log(Level.SEVERE, null, ex);
        }

    }
});


StackPane root = new StackPane();


root.getChildren().add(pane);




Scene scene = new Scene(root, 600, 600);


primaryStage.setScene(scene);
primaryStage.show();
}}