Merge pdf files

Question

Is it possible to read two blobs and merege them into one pdf file? I have been able to a blob and write it to a file, however I am still struggling in reading two of them and merging them both into one pdf file.OutputStream fwriter = new FileOutputStream("c:\\test _new.pdf");
                         wrote = readFromBlob(blob, fwriter);
                         fwriter.close();
final static int bBufLen = 4 * 8192;
public long readFromBlob(Blob blob, OutputStream out) throws SQLException, IOException
     InputStream in = blob.getBinaryStream();
     int length = -1;
     long read = 0;
     byte[] buf = new byte[bBufLen];
     while ((length = in.read(buf)) != -1)
          out.write(buf, 0, length);
          read += length;
     in.close();
     return read;
}what I am trying to do is to pass two blobs to this method readFromBlob and then merge them to wrie to a file so if I pass two blobs
public long readFromBlob(Blob blob1, Blob blob2, OutputStream out) throws SQLException, IOException
     InputStream in = blob1.getBinaryStream();
                      InputStream in2 = blob2.getBinaryStream();
     int length = -1;
     long read = 0;
     byte[] buf = new byte[bBufLen];
     while ((length = in.read(buf)) != -1)
          out.write(buf, 0, length);
          read += length;
                     while ((length = in2.read(buf)) != -1)
          out.write(buf, 0, length);
          read += length;
     in.close();
     return read;
}But this doesnot seem to work? And advice!!!!

Answer 1

public void addPDFContent(Document pDocument, PdfWriter pWriter, java.io.InputStream is) throws DocumentException, IOException
     PdfReader reader = new PdfReader(is);
     int numberOfPages = reader.getNumberOfPages();
     PdfContentByte cb = pWriter.getDirectContent();
     for (int i = 1; i <= numberOfPages; i++)
          if (i > 0)
               pDocument.newPage();
          PdfImportedPage page = pWriter.getImportedPage(reader, i);
          cb.addTemplate(page, 0, 0);
}