Take a look at MemoryUsageSetting parameter for load()
On Mon, Sep 18, 2023, 7:56 AM Derryl Varghese <derrylvargh...@gmail.com>
wrote:
> Hello all,
> We moved from using iText to PDFBox to stamp our PDFs before serving to our
> customers. We occasionally run out of our 4GB heap space on weblogic (2gb
> taken up by pdfs being stamped) during our busy periods. Before we consider
> scaling out, I'd like to know if there is any code improvements that can be
> done to the below stamping code to improve performance. Is stamping after
> loading into memory the only way to go about this?
>
> Thanks in advance!
>
> public static void stampDocument(String pdfPath, String stampText,
> HttpServletResponse response) throws IOException {
>
> try (PDDocument doc = PDDocument.load(new File(pdfPath))) {
> if (doc.isEncrypted()) {
> try {
> doc.setAllSecurityToBeRemoved(true);
> } catch (Exception e) {
> log.error("The document is encrypted and we can't decrypt it. {}",
> e.getMessage());
> }
> }
> PDPageTree allPages = doc.getDocumentCatalog().getPages();
> float fontSize = 7;
> int margin = 30;
>
> for (PDPage page : allPages) {
> PDRectangle box = page.getCropBox();
> if (box == null) {
> box = page.getMediaBox();
> }
> PDFont font = PDType1Font.HELVETICA;
> float titleWidth = (font.getStringWidth(text) / 1000) * fontSize;
> float titleHeight =
> (font.getFontDescriptor().getFontBoundingBox().getHeight() / 1000) *
> fontSize;
>
> float startX = (box.getWidth() - titleWidth) / 2;
> float startY = page.getMediaBox().getLowerLeftY() + margin - titleHeight;
>
> try (PDPageContentStream contentStream = new PDPageContentStream(doc, page,
> PDPageContentStream.AppendMode.APPEND, true, true)) {
> contentStream.beginText();
> contentStream.setFont(font, fontSize);
> contentStream.setStrokingColor(Color.BLACK);
> contentStream.setLeading(10);
> contentStream.newLineAtOffset(startX, startY);
> contentStream.showText(text);
> contentStream.endText();
> contentStream.closeAndStroke();
> }
> }
> doc.save(new BufferedOutputStream(response.getOutputStream()));
> }
> }
>
