private static void concatPDFs(List<String> pdfs, OutputStream outputStream, String tempDiv) {
ByteArrayOutputStream byteStream = null;
Document document = new Document();
try {
PdfCopy copy = new PdfCopy(document, outputStream);
document.open();
for (String pdf : pdfs) {
String fileLocation = tempDiv + pdf;
InputStream templateIs = new FileInputStream(fileLocation);
PdfReader reader = new PdfReader(templateIs);
byteStream = new ByteArrayOutputStream();
PdfStamper stamper = new PdfStamper(reader, byteStream);
stamper.setFreeTextFlattening(true);
stamper.setFormFlattening(true);
stamper.close();
PdfReader pdfReader = new PdfReader(byteStream.toByteArray());
for (int page = 0; page < pdfReader.getNumberOfPages(); ) {
copy.addPage(copy.getImportedPage(pdfReader, ++page));
}
pdfReader.close();
reader.close();
}
document.close();
copy.close();
} catch (Exception e) {
logger.error(e, e);
} finally {
if (document.isOpen()) document.close();
try {
if (outputStream != null) outputStream.close();
} catch (IOException ioe) {
logger.error(ioe, ioe);
}
}
}
private static void merge(String output, Collection<Path> all) {
try {
Document document = new Document();
PdfCopy copy = new PdfCopy(document, new FileOutputStream(output));
document.open();
PdfReader reader;
int n;
for (Path pathTemp : all) {
if (pathTemp.toFile().getAbsolutePath().endsWith(".pdf")) {
reader = new PdfReader(pathTemp.toFile().getAbsolutePath());
n = reader.getNumberOfPages();
for (int page = 0; page < n; ) {
copy.addPage(copy.getImportedPage(reader, ++page));
}
copy.freeReader(reader);
reader.close();
}
}
document.close();
} catch (Exception e) {
System.out.println(e);
}
}
