如何在vaadin中打开生成的PDF？

Question

In my vaadin application I have a Table with an additional column containing a print Button . The Button calls the following util method to create a pdf and open it in a new window ( ui parameter is the button):

public static void printPDF(Offer offer, AbstractComponent ui) throws IOException, DocumentException, TemplateException {
    // ... create PDF 

    FileResource resource = new FileResource(pdfFile);

    BrowserWindowOpener opener = new BrowserWindowOpener(resource);
    opener.setFeatures("");
    opener.extend(ui);
}

Now clicking the button the first time does not work. Clicking it the second time works. Clicking it the third time, opens two windows. This increases on every further click.

I also want to open the pdf using the context menu eg

table.addActionHandler(new Handler()...

There I don't even have a button to extend. I would prefer to, not use the .extend() part and just open a new window. How can I do that?

EDIT : This blocks the button from opening mulitple instances, still not a nice solution and the first click does not work.

Collection<Extension> extensions = ui.getExtensions();
for (Extension e : extensions) {
    if (e instanceof BrowserWindowOpener) {
        ((BrowserWindowOpener) e).setResource(resource);
        return;
    }
}

I guess I would need to create a BrowserWindowOpener for every print Button in my Table .
Not a very clean solution, the table may contain lots of rows which would create a lot of BrowserWindowOpener instances which will never be used. The context menu problem would not be solved as well.

EDIT2: This is the other solution I tried:

ResourceReference rr = ResourceReference.create(resource, ui, "print");
Page.getCurrent().open(rr.getURL(), "blank_");

Here I get the following error:

Button (175) did not handle connector request for print/2016_9090_R_1634500091131558445.pdf

Answer 1

You can use the FileDownloader to achieve what you want.

FileResource resource = new FileResource(pdfFile);
FileDownloader downloader = new FileDownloader(resource);
Button pdf= new Button("Download PDF");
downloader.extend(pdf);

Answer 2

Use this code

    Window window = new Window();
((VerticalLayout) window.getContent()).setSizeFull();
window.setResizable(true);
window.setCaption("Exemplo PDF");
window.setWidth("800");
window.setHeight("600");
window.center();
StreamSource s = new StreamResource.StreamSource() {

@Override
public InputStream getStream() {
try {
File f = new File("C:/themes/repy.pdf");
FileInputStream fis = new FileInputStream(f);
return fis;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
};

StreamResource r = new StreamResource(s, "repy.pdf", mainLayout.getApplication());
Embedded e = new Embedded();
e.setSizeFull();
e.setType(Embedded.TYPE_BROWSER);
r.setMIMEType("application/pdf");

e.setSource(r);
window.addComponent(e);
getMainWindow().addWindow(window);