Как добавить общее количество страниц на каждой странице с помощью iText?

Question

Как добавить общее количество страниц на каждой странице с помощью iText?

Answer 1

Попробуйте, потому что я тоже страдал от этого, и я также создал эту библиотеку, поэтому после многих неприятностей я получил результат, просто попытался применить логику дважды, как я упоминал в комментариях.

class PdfReportServlet extends HttpServlet
{
    public static int total = 0;

    public static int getTotal() 
    {
        return total;
    }

    public static void setTotal(int total) {
        PdfReportServlet .total = total;
    }


    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        String reportFor = request.getParameter("report");
        if(!"".equals(reportFor))
        {
            if(reportFor.equals("pdf"))
            {
    /* 
       from here logic starts
    */
                response.setContentType("application/pdf");
                Document document = new Document(PageSize.LETTER.rotate());
                try
                {
                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
                    PdfWriter pdfWriter = PdfWriter.getInstance(document, bos);
                    PdfReport pdfReport = new PdfReport();
                    pdfWriter.setPageEvent(pdfReport);
                    document.open();
                    String id = request.getParameter("id");
                    DettagliFamigliaPDFReport.generatePDFReport(document,id);
                    document.close();

                    /*
                     * now again give new references to Document and PdfWriter classes.
                     */

                    document = new Document(PageSize.LETTER.rotate());

                    pdfWriter = PdfWriter.getInstance(document, response.getOutputStream());
                    PDFReport.setTotalPages(getTotal());/*##PAGES_TOTAL here i set total Pages which i get from above logic */
                    PdfReport pdfReport = new PdfReport();
                    pdfWriter.setPageEvent(pdfReport);
                    document.open();
                    id = request.getParameter("id");
                    PDFReport.generatePDFReport(document,id);
                    document.close();

                }
                catch(DocumentException de){
                    de.printStackTrace();
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }


}


/*
    Here below i write the class inherits the PdfPageEventHelper class and also having generatePDFReport() method.
*/


public class PDFReport extends PdfPageEventHelper
{
    public static PdfTemplate template;
    public static int totalPages=0;

    public static int getTotalPages() {
        return totalPages;
    }

    public static void setTotalPages(int totalPages) {
        DettagliFamigliaPDFReport.totalPages = totalPages;
    }


    public static void generatePDFReport(Document document,String id)
    {
        // here your data to write on page of pdf.
    }

    @Override
    public void onOpenDocument(PdfWriter writer, Document doc) 
    {
        template = writer.getDirectContent().createTemplate(100, 100);
    }

    int totalPage = 0;
    @Override
    public void onCloseDocument(PdfWriter writer, Document doc) 
    {
        totalPage = writer.getPageNumber() - 1;/* at the end this method calls and you will get total number of pages.*/
        PdfReportServlet.setTotal(totalPage); /* while first time logic of servlet executes then i set the total pages to servlet's variable using this logic.
and second time servlet's logic is executing i passed totalPages to this class variable
where i marked ##PAGES_TOTAL  */
    }

    @Override
    public void onStartPage(PdfWriter writer, Document doc) {
        // Here i write header logic when each time page starts.
    }

    @Override`enter code here`
    public void onEndPage(PdfWriter writer, Document doc) 
    {
        Rectangle rect = writer.getPageSize();
        float width = rect.getWidth()/2;   

        DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
        Date date = new Date();

        String footerOne = "This document is printed on date "+dateFormat.format(date)+" - Page. "+writer.getPageNumber()+" of "+getTotalPages();

        Paragraph paraOne = new Paragraph(footerOne);

        Font fontFooter = new Font();
        fontFooter.setSize(8);
        fontFooter.setColor(Color.gray);

        paraOne.setFont(fontFooter);

        Phrase footerPhraseOne = new Phrase(paraOne);
        ColumnText.showTextAligned(writer.getDirectContent(),
                Element.ALIGN_CENTER, footerPhraseOne,
                width, 30, 0);
    }
}