根据mkl，我使用了PdfStamper：

According to mkl I used the PdfStamper:

private static void print(Sldocuments item, String header, String footer) {
try {
String ftpFilename = item.getId()+"_"+item.getDocumentname();
    String newName= String.valueOf(item.getId())+".pdf";
    String path = (Global.SHARED_FOLDER_DEVELOPER);

    String smbUser = "**;"+"**" + ":" + "**";
    NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(smbUser);
    SmbFile sFile = new SmbFile(path+ftpFilename, auth);

    InputStream in = sFile.getInputStream();

    PdfReader reader = new PdfReader(in);

    // Create output PDF
        SmbFile sFileOut = new SmbFile(path+newName, auth);
        SmbFileOutputStream sfos = new SmbFileOutputStream(sFileOut);

        PdfStamper stamper  = new PdfStamper(reader, sfos);
        // Loop over the pages and add a header to each page
        int n = reader.getNumberOfPages();
        for (int i = 1; i <= n; i++) {
            //add header
            PdfPTable table = new PdfPTable(1);
            table.setTotalWidth(PDF_PAGE_SIZE.getWidth()-(headerPositionX*2));
            table.setLockedWidth(true);
            table.getDefaultCell().setFixedHeight(20);
            table.getDefaultCell().setBorder(Rectangle.NO_BORDER);
            table.addCell(header);
            table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
            table.addCell("");
            table.writeSelectedRows(0, -1, headerPositionX, headerPositionY, stamper.getOverContent(i));

            //add footer
            PdfPTable tableFooter = new PdfPTable(2);
            tableFooter.setTotalWidth(PDF_PAGE_SIZE.getWidth()-(footerPositionX*2));
            tableFooter.setLockedWidth(true);
            tableFooter.getDefaultCell().setFixedHeight(20);
            tableFooter.getDefaultCell().setBorder(Rectangle.NO_BORDER);
            tableFooter.addCell(footer);
            tableFooter.getDefaultCell().setHorizontalAlignment(Element.ALIGN_RIGHT);
            tableFooter.addCell(String.format("pagina %d of %d", i, n));
            tableFooter.writeSelectedRows(0, -1, footerPositionX, footerPositionY*4, stamper.getOverContent(i));
        }

        // Close the stamper
        stamper.close();
        reader.close();

    } catch (DocumentException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}