Question

我想使用javafx打印从PDFFile库中打印Pdf-Renderer对象。是否可以打印非Node个对象？目前我正在使用AWT打印（check this example），但它与javafx不太合适，因为当AWT打印对话框出现时我的javafx窗口会冻结。

Printer printer = Printer.getDefaultPrinter();
PageLayout pageLayout = printer.createPageLayout(Paper.A4, PageOrientation.PORTRAIT, Printer.MarginType.DEFAULT);

PrinterJob job = PrinterJob.createPrinterJob();
if (job != null) {
    boolean success = job.printPage(node); // use something otherthan a node(PDFFile in my case)
    if (success) {
        job.endJob();
    }
}

Answer 1

您可以从每个页面获得java.awt.Image，将页面绘制为java.awt.image.BufferedImage将BufferedImage转换为javafx.scene.image.Image，最后打印ImageView包含图像：

类似的东西：

PrinterJob job = PrinterJob.createPrinterJob();
PDFFile pdfFile = ... ;
if (job != null) {
    boolean success = true ;
    for (int pageNumber = 1; pageNumber <= pdfFile.getNumPages() ; pageNumber++) {
        PDFPage page = pdfFile.getPage(pageNumber, true);
        Rectangle2D bounds = page.getBBox();
        int width = (int) bounds.getWidth();
        int height = (int) bounds.getHeight();
        java.awt.Image img = page.getImage(width, height, bounds, null, true, true);
        BufferedImage bImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        bImg.createGraphics().drawImage(img, 0, 0, null);
        javafx.scene.image.Image fxImg = SwingFXUtils.toFXImage(bImg, null);
        ImageView imageView = new ImageView(fxImg);
        success = success & job.printPage(imageView);
    }

    if (success) {
        job.endJob();
    }
}

请注意，此代码可以在FX Application Thread下执行，以保持UI响应。

JavaFX打印非节点对象

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