How to merge PDF file and HTML Text while generating PDF file dynamically using ITextPDF Java?

Question

I have requirement in my project to generate PDF files dynamically. this PDF file should contain Header image, Footer Image and some content depending upon parameters passed to my servlet. These contents can be in HTML text format and can be PDF files or both. I am able to create PDF file for HTML text using HTMLWorker and able to copy PDF file as well, but whenever content comes in HTML and PDF file then some how its not working. My contents are getting overridden. Here is the code, I am trying right now.

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.StringReader;
import java.net.MalformedURLException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.html.simpleparser.HTMLWorker;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
public class itextPdf {
static class PageHeader extends PdfPageEventHelper{
    String header;

    public void setHeader(String header) {
        this.header = header;
    }

    public void onEndPage(PdfWriter writer, Document document) {
        System.out.print("Yeahhhhh...now add header");
        PdfPTable table = new PdfPTable(1);
        try {
            table.setWidths(new int[]{527});
            table.setTotalWidth(600);
            table.setLockedWidth(true);
            table.getDefaultCell().setFixedHeight(40);
            //table.getDefaultCell().setBorder(Rectangle.BOTTOM);
            Image img = Image.getInstance(header);
            img.setScaleToFitLineWhenOverflow(true);
            PdfPCell cell = new PdfPCell(img);
            //cell.setBorder(Rectangle.BOTTOM);
            table.addCell(cell);
            table.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);
            //table.addCell(String.format("Page %d of", writer.getPageNumber()));
            //PdfPCell cell = new PdfPCell(Image.getInstance(total));
            //cell.setBorder(Rectangle.BOTTOM);
            //table.addCell(cell);
            //System.out.println(850 - document.topMargin() + table.getTotalHeight());
            table.writeSelectedRows(0, -1, 0, 845 , writer.getDirectContent());
        }
        catch(DocumentException de) {
            throw new ExceptionConverter(de);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public static void main(String[] args){
    try{
        Document document = new Document(PageSize.A4, 50, 50, 50, 50);
        FileOutputStream fos = new FileOutputStream("parsedpdf.pdf");
        PdfWriter pdfWriter = PdfWriter.getInstance(document, fos);
        PageHeader event = new PageHeader();
        event.setHeader("C:/logos/120x60_KU.jpg");

        pdfWriter.setPageEvent(event);
        document.open();
        document.addAuthor("Author of the Doc");
        document.addCreator("Creator of the Doc");
        document.addSubject("Subject of the Doc");
        document.addCreationDate();
        document.addTitle("This is the title");

        //SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
        //SAXmyHtmlHandler shh = new SAXmyHtmlHandler(document);

        HTMLWorker htmlWorker = new HTMLWorker(document);
        String str = "<B>NINAD ROCKS</B> :: <table><tr><td><p style=’font-size: 10pt; font-family: Times’>" +
            "Cher Monsieur,</p><br><p align=’justify’ style=’text-indent: 2em; font-size: 10pt; font-family: Times’>" +
            "asdasdasdsadas<br></p><p align=’justify’ style=’text-indent: 2em; font-size: 10pt; font-family: Times’>" +
            "En vous remerciant &agrave; nouveau de la confiance que vous nous t&eacute;moignez,</p>" +
            "<br><p style=’font-size: 10pt; font-family: Times’>Bien Cordialement,<br>" +
            "<br>ADMINISTRATEUR ADMINISTRATEUR<br>Ligne directe : 04 42 91 52 10<br>Acadomia&reg; – " +
            "37 BD Aristide Briand  – 13100 Aix en Provence  </p></td></tr></table>";
        StringBuffer sb = new StringBuffer(str);

        for(int i=0; i< 5 ; i++){
            sb.append(str);
        }
        htmlWorker.parse(new StringReader(sb.toString()));

        Image image = Image.getInstance("C:/Documents/Shared/compliance/btn_submit1.jpg");
        document.add(image);
        //document.add

        PdfReader reader = new PdfReader("C:/Ebooks/Interview/interview_questions 3.pdf");
        int size = reader.getNumberOfPages();
        System.out.println("Size:" + size);
        PdfPTable table = new PdfPTable(2);
        document.newPage();
        PdfImportedPage page;
        PdfContentByte cb = pdfWriter.getDirectContent();
        Rectangle psize = reader.getPageSize(1);
        float width = psize.getWidth();
        for(int i=1; i <=size; i++){
            //byte[] dataBytes = reader.getPageContent(i);
            //System.out.println(i + " " + dataBytes.length);
            //PdfObject pbo = new PdfStream(dataBytes);
            //((PdfStream)pbo).writeContent(fos);
            System.out.println("In:" + i);
            page = pdfWriter.getImportedPage(reader, i);
            cb.addTemplate(page, 0 , 0);
            System.out.println("$$" +page.toString());
            table.addCell(Image.getInstance(page));
            //document.add(page);
        }
        document.add(table);
        cb.beginText();
        cb.setFontAndSize(BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 9);
        String str1 = "<B>NINAD ROCKS</B> :: FOOTER FOOTER :: NINAD ROCKS :: FOOTER FOOTER";
        cb.showText(str1);
        cb.endText();

        document.close();
        HTMLWorker htmlWorker1 = new HTMLWorker(document);
        StringBuffer sb1 = new StringBuffer(str1);
        htmlWorker1.parse(new StringReader(sb1.toString()));

        document.close();
    }catch(Exception e){
        e.printStackTrace();
    }
}
}

Please help with this. Or let me know if there is any other way to achieve my functionality.