JavaFX PrinterJob打印随机字符，而不是常规文本

PrinterJob printerJob = PrinterJob.createPrinterJob();

if (printerJob != null && printerJob.showPrintDialog(null)) {
    // 打印任务未被取消
    // 继续下面的打印操作
} else {
    // 打印任务被取消
    return;
}

Text randomText = new Text(generateRandomString());
randomText.setFont(Font.font("Arial", 12));

Printer printer = printerJob.getPrinter();
PageLayout pageLayout = printer.createPageLayout(Paper.A4, PageOrientation.PORTRAIT, Printer.MarginType.DEFAULT);
double printableWidth = pageLayout.getPrintableWidth();
double printableHeight = pageLayout.getPrintableHeight();

randomText.setWrappingWidth(printableWidth);
randomText.setTextAlignment(TextAlignment.CENTER);

double startX = (printableWidth - randomText.getBoundsInLocal().getWidth()) / 2;
double startY = (printableHeight - randomText.getBoundsInLocal().getHeight()) / 2;

printerJob.getJobSettings().setPageLayout(pageLayout);

printerJob.getJobSettings().setPrintable((pageIndex) -> {
    if (pageIndex != 0) {
        return false;
    }
    PrinterJob.getPrinterJob().getJobSettings().setPageLayout(pageLayout);
    PrinterJob.getPrinterJob().getJobSettings().setPrintable(null);
    return true;
}, pageLayout);

printerJob.getJobSettings().setPrintable((graphics, pageFormat, pageIndex) -> {
    if (pageIndex != 0) {
        return Printable.NO_SUCH_PAGE;
    }
    graphics.setFont(randomText.getFont());
    graphics.fillText(randomText.getText(), startX, startY);
    return Printable.PAGE_EXISTS;
}, pageLayout);

boolean success = printerJob.printPage(pageLayout, randomText);
if (success) {
    printerJob.endJob();
} else {
    // 打印失败
}