Pills wrote:
Hello guys,
I have a little question. I use jasperreport to generate some pdf files. My use case requires to merge some pdf together (append a pdf at the end of another) to print them all at one time.
How can I do that?
Thank you ;)
Thanks. I found it (with iText):
public static void merge(List<InputStream> streamOfPDFFiles, OutputStream outputStream) throws IOException, DocumentException {
Document document = new Document();
try {
List<InputStream> pdfs = streamOfPDFFiles;
List<PdfReader> readers = new ArrayList<PdfReader>();
int totalPages = 0;
Iterator<InputStream> iteratorPDFs = pdfs.iterator();
while (iteratorPDFs.hasNext()) {
InputStream pdf = iteratorPDFs.next();
PdfReader pdfReader = new PdfReader(pdf);
readers.add(pdfReader);
totalPages += pdfReader.getNumberOfPages();
}
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
PdfImportedPage page;
int currentPageNumber = 0;
int pageOfCurrentReaderPDF = 0;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
while (iteratorPDFReader.hasNext()) {
PdfReader pdfReader = iteratorPDFReader.next();
while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
document.newPage();
pageOfCurrentReaderPDF++;
currentPageNumber++;
page = writer.getImportedPage(pdfReader, pageOfCurrentReaderPDF);
cb.addTemplate(page, 0, 0);
}
pageOfCurrentReaderPDF = 0;
}
outputStream.flush();
} finally {
if (document.isOpen()) {
document.close();
}
closeNoExc(outputStream);
}
}
