Render itext pdf as a web page and save it same to a DB in one go (using Spring)

Question

@Override
protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {

    PdfWriter pdfWriter = new PdfWriter(response.getOutputStream());
    PdfDocument pdf = new PdfDocument(pdfWriter);
    Document doc = new Document(pdf);

with the above code, I am rendering a pdf as an html response. When I do that, I also want to save this to the database. How should I do it?

Should I create another byte stream and redo the same steps?