iText : How do I insert background image in the same document to be flushed to response

Question

I am creating a PDF and writing the stream in response. Before writing in the stream, I want to add a background image as watermark in all the pages so that PDF document flu

Answer 1

I have solved this with Bruno's second option. Here is the code.

public static String addBackgroundImageToPDF(ByteArrayOutputStream bos, String destPdfFileName, String templateImageFile)
{
  PdfReader sourcePDFReader = null;
  try
  {
        sourcePDFReader = new PdfReader(bos.toByteArray());
        int noOfPages = sourcePDFReader.getNumberOfPages();
        PdfStamper stamp = new PdfStamper(sourcePDFReader, new FileOutputStream(destPdfFileName));
        int i = 0;
        Image templateImage = Image.getInstance(templateImageFile);
        templateImage.setAbsolutePosition(0, 0);
        PdfContentByte tempalteBytes;
        while (i < noOfPages)
        {
              i++;
              tempalteBytes = stamp.getUnderContent(i);    
              tempalteBytes.addImage(templateImage);  
        }
         stamp.close();
        return destPdfFileName;
  }
  catch (Exception ex)
  {
        LOGGER.log(Level.INFO, "Error when applying template image as watermark");
  }
  finally
  {
        if (sourcePDFReader != null)
        {
              sourcePDFReader.close();
        }
  }
}