Subversion Repositories SmartDukaan

    public static byte[] mergePdfFiles(List<byte[]> pdfFiles) throws IOException, DocumentException {

        ByteArrayOutputStream mergedOutputStream = new ByteArrayOutputStream();

        Document document = new Document();

        PdfCopy copy = new PdfCopy(document, mergedOutputStream);

        document.open();

        for (byte[] pdf : pdfFiles) {

            PdfReader reader = new PdfReader(new ByteArrayInputStream(pdf));

            int n = reader.getNumberOfPages();

            for (int i = 1; i <= n; i++) {

                copy.addPage(copy.getImportedPage(reader, i));

            }

            copy.freeReader(reader);

            reader.close();

        }

        document.close();

        return mergedOutputStream.toByteArray();

    }