JavaFX - 以编程方式设置目标路径以直接将节点打印到 pdf 文件

Question

我想使用“Microsoft Print to PDF”打印机将节点打印到 pdf 文件。假设 Printer 对象已经被提取，我有下一个功能，它可以完美地工作。

public static void printToPDF(Printer printer, Node node) {

    PrinterJob job = PrinterJob.createPrinterJob(printer);
    if (job != null) {
        job.getJobSettings().setPrintQuality(PrintQuality.HIGH);

        PageLayout pageLayout = job.getPrinter().createPageLayout(Paper.A4, PageOrientation.PORTRAIT,
                Printer.MarginType.HARDWARE_MINIMUM);

        boolean printed = job.printPage(pageLayout, node);
        if (printed) {
            job.endJob();
        } else {
            System.out.println("Printing failed.");
        }
    } else {
        System.out.println("Could not create a printer job.");
    }
}

我遇到的唯一问题是弹出一个对话框，询问保存 pdf 的目标路径。我正在努力寻找以编程方式设置路径的解决方案，但没有成功。有什么建议吗？预先感谢您。

Answer 1

经过更多研究，我得到了一个丑陋的黑客。我从 PrinterJob 访问了 jobImpl 私有字段，并从中取出了属性。因此，我插入了目标属性，显然它正在按要求工作。我知道这不太好，但是……是可行的。如果您有更好的建议，欢迎留言。

         try {
            java.lang.reflect.Field field = job.getClass().getDeclaredField("jobImpl");
            field.setAccessible(true);
            PrinterJobImpl jobImpl = (PrinterJobImpl) field.get(job);
            field.setAccessible(false);

            field = jobImpl.getClass().getDeclaredField("printReqAttrSet");
            field.setAccessible(true);
            PrintRequestAttributeSet printReqAttrSet = (PrintRequestAttributeSet) field.get(jobImpl);
            field.setAccessible(false);

            printReqAttrSet.add(new Destination(new java.net.URI("file:/C:/deleteMe/wtv.pdf")));
        } catch (Exception e) {
            System.err.println(e);
        }

Answer 2

感谢上述解决方案。这是没有 *Impl 实例的同类，它的工作方式为 Object xxx = ... :

    ObservableSet<Printer> printers = Printer.getAllPrinters();
    if (printers != null && !printers.isEmpty())
    {
        Printer defaultPrinter = printers.iterator().next();
        PrinterJob printerJob = PrinterJob.createPrinterJob(defaultPrinter);
        if(printerJob != null)
        {
           // printerJob.showPrintDialog(thisState);
            String selectedPrinter = printerJob.getPrinter().getName();
            PageLayout pageLayout
                    = defaultPrinter.createPageLayout(Paper.A4, PageOrientation.PORTRAIT, Printer.MarginType.HARDWARE_MINIMUM);
            PrinterAttributes attr = defaultPrinter.getPrinterAttributes();
           // HashPrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
            // set the output file as a destination
            File currDir = new File(".");
            File destinationFile = new File(currDir.getAbsolutePath()
                    +File.separatorChar +"output.ps");
            BasicFileAttributes fileAttr = null;
            Path filePath = Paths.get(destinationFile.getAbsolutePath());
            fileAttr = getFileAttributes(filePath);
            Destination destination = new Destination(destinationFile.toURI());
            // attributes.add(destination);
            // set the attributes to the printerjob
            JobSettings jobSettings = printerJob.getJobSettings();
            jobSettings.setPrintQuality(PrintQuality.HIGH);
          //  PrinterAttributes defAttributes = defaultPrinter.getPrinterAttributes();

            try {
                java.lang.reflect.Field field = printerJob.getClass().getDeclaredField("jobImpl");
                field.setAccessible(true);
                Object jobImpl = field.get(printerJob);
                field.setAccessible(false);

                field = jobImpl.getClass().getDeclaredField("printReqAttrSet");
                field.setAccessible(true);
                PrintRequestAttributeSet printReqAttrSet = (PrintRequestAttributeSet) field.get(jobImpl);
                field.setAccessible(false);
                printReqAttrSet.add(destination);
                BasicFileAttributes fileAttrAfter = getFileAttributes(filePath);
                if (fileAttr != null && fileAttrAfter != null)
                {
                    if (fileAttrAfter.equals(fileAttr))
                    {
                        labelMsg.setText("Printing into " +destinationFile.getName() +
                                " successfully. Now generated .pdf file!");
                        generatingPdfFileAfterPsFile(destinationFile);
                    }
                }
            } catch (Exception e) {
                System.err.println(e);
                labelMsg.setText("Error destination in print: " +e.getMessage());
                return;
            }
             // add(new Destination(new File(currDir.getAbsolutePath() +File.separatorChar +"output.gs").toURI()));
            // MyPrintable will have to be defined to implement the print method
          //  pjob.setPrintable(new MyPrintable(), new PageFormat())
            try {
                WebEngine webEngine = webView.getEngine();
                webEngine.print(printerJob);
                printerJob.endJob();
            } catch (Exception ex) {
                System.out.println(ex);
                labelMsg.setText("Error in printing: " +ex.getMessage());
            }