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);
}
}
