iText: Page content overlapping with footer and also not generating new page.

[saravanan sambandam]

Team i am new to itextpdf, and altering existing Production code.  I am facing below issues
#1. User send htmlContent with contain 5000-characters. Body commentTable overlapping with footer part,
#2. New page not generating, if generated then content will be forwarded.

Problem: getContentAsElementList() - String content parsed using itextPdf xmlParse.  The element is added into cell.  This not forwarding into new page.  If the cell not to accomodate the entire string.

public class PdfGenerate {
public static ByteArrayOutputStream generatePdf(String htmlContent) { 
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	PtfPTable mainTable = new PtfPTable();
	try {
		// create A4 size document
		Document document = new Document(PageSize.A4, 15, 15, 50, 80);
		// getting writer with bytearraystream
		PdfWriter writer = PdfWriter.getInstance(document,baos);
		pdfHeaderFooterHander eventHandler = new pdfHeaderFooterHander();
		writer.setPageEvent(eventHandler);
						
		// opening document
		document.open();
		// getting page width
		float pageWidth = PageSize.A4.getWidth()-100;
		//creating page table to hold all the content in the gate
		PdfPTable mainTable = new PdfPTable(1);
		PdfPTable commentTable = new PdfPTable(1);
		cell = new PdfPCell();
		ElementList elemList = getElementList(htmlContent);
		for(Element e : elemList){
			cell.addElement(e);
		}
		commentTable.addCell(cell);
		cell.addElement(Chunk.NEWLINE);
		commentTable.addCell(cell);
		//add comment table into mainTable
		Cell tmpCell = new PdfPCell(commentTable);
		tmpCell.setBorder(Rectangle.NO_BORDER);
		mainTable.addCell(tmpCell);
		//ceeDetails
		Cell ceeDtsCell = new PdfPCell(new Pharse("Testing"));
		ceeDtsCell.setBorder(Rectangle.NO_BORDER);
		mainTable.addCell(ceeDtsCell);
		// opening document
		mainTable.writeSelectedRows(0, -1, 50, 50, writer.getDirectContent());
		document.close();
	}catch(Exception e) {
		e.printStrackTrace();
	}
	return baos;
}

public ElementList getElementList(String content) throws IOException {
	//resolvers for converting html to pdf elements
	CSSResolver cssResolver =  XMLWorkerHelper.getInstance().getDefaultCssResolver(true);
	ElementList elements = new ElementList();
	ElementHandlerPipeline end = new ElementHandlerPipeline(elements, null);
	// HTML
	HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
	htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
	htmlContext.setImageProvider(new Base64ImageProvider());
	// Pipelines
	HtmlPipeline html = new HtmlPipeline(htmlContext, end);
	CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);
	// XML Worker
	XMLWorker worker = new XMLWorker(css, true);
	XMLParser p = new XMLParser(worker);
	p.parse(new ByteArrayInputStream(content.getBytes()));
	return elements;
}	
}

 public class pdfHeaderFooterHander extends PdfPageEventHelper {
	
	private PdfPTable header = new PdfPTable(1);
	private PdfPTable footer = new PdfPTable(1);
		
	public void onEndPage(PdfWriter writer, Document document) {
		PdfContentByte cb = writer.getDirectContent();
		header.writeSelectedRows(0, -1, PageSize.A4.getLeft()+15,
		PageSize.A4.getTop()-20, cb);
		 
		PdfPTable table = new PdfPTable(1);
		table.setTotalWidth(PageSize.A4.getWidth()-45);
		String pageNum = "Page "+writer.getPageNumber();
		table.addCell(getPhraseCell(pageNum,footerFont));
		PdfPCell cell = new PdfPCell(footer);
		cell.setBorder(Rectangle.NO_BORDER);
		table.addCell(cell);
		table.addCell(getParagraphCell("Company Name/n Address/n Phone No./n 
		website/n",footerFont));
		table.writeSelectedRows(0, -1, PageSize.A4.getLeft()+20, 
		PageSize.A4.getBottom()+20+table.getTotalHeight(), cb);
	}
 }
 

#3.I verified with  standalone programe (GeneratePDF) string  5000-characters.  New page generating header & footer working fine.

public class GeneratePDF {

	public void createPDF(){
		try {
			FileOutputStream fos = new FileOutputStream("D:/AddImage1111.pdf");
			Document document = new Document(PageSize.A4, 15, 15, 20, 80);
			PdfWriter writer = PdfWriter.getInstance(document, fos);
			PageChangeEventHandler eventHandler = new PageChangeEventHandler();
			writer.setPageEvent(eventHandler);
			document.open ();

			Font headerFont = new Font(Font.FontFamily.HELVETICA, 22, Font.BOLD);
			Paragraph paragraph = new Paragraph("Verification", headerFont);
			document.add(paragraph);
			document.add(Chunk.SPACETABBING);
			PdfPTable table = new PdfPTable(1);
			table.setWidthPercentage(100);   
			StringBuilder sb_str = new StringBuilder();
			sb_str.append("Hitting continued support from Indianwe\n");
			final String content = sb_str.toString();
			cell = new PdfPCell(new Paragraph(content));   
			table.addCell(cell);
			PdfPCell emptyCell = new PdfPCell(new Paragraph(""));
			table.addCell(emptyCell);
			document.add(table);
			document.close ();
		} catch (FileNotFoundException e | Exception e ) {
			e.printStackTrace();
		}
			System.out.println("******** PDF Created ***************");
	}
 }

 public class PageChangeEventHandler extends PdfPageEventHelper {		
	public void onStartPage(PdfWriter writer, Document document) {
	 try {
		addHeader(document); //adding image
		ColumnText.showTextAligned(writer.getDirectContent(), 
		Element.ALIGN_CENTER, new Phrase(), 30, 800, 0);
		ColumnText.showTextAligned(writer.getDirectContent(), 
		Element.ALIGN_CENTER, new Phrase(), 550, 800, 0);
	  } catch (DocumentException e) {
		e.printStackTrace();
	 }
  }

  public void onEndPage(PdfWriter writer, Document document) {
	addFooter(writer); //adding company address
	ColumnText.showTextAligned(writer.getDirectContent(), 
	Element.ALIGN_CENTER, new Phrase("page " + document.getPageNumber(), 
	footerFont), 550, 30, 0); 
  }
    
  private void addFooter(PdfWriter writer){
	PdfPTable footer = new PdfPTable(1);
	try {
		footer.setTotalWidth(527);
		PdfPCell cell;
		cell = new PdfPCell(new Phrase("CompanyName/nAddress/nPhone No./n 
		website:", footerFont));
		cell.setBorder(Rectangle.NO_BORDER);
		cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);
		footer.addCell(cell);
		// write page
		PdfContentByte canvas = writer.getDirectContent();
		canvas.beginMarkedContentSequence(PdfName.ARTIFACT);
		footer.writeSelectedRows(0, -1, 34, 50, canvas);
		canvas.endMarkedContentSequence();
	} catch(Exception de) {
		throw new ExceptionConverter(de);
	}
  }

  private void addHeader(Document document) throws DocumentException {
	Base64ImageProvider provider = new Base64ImageProvider();
	Image image = provider.retrieve(IMG_DATA);
	image.scaleAbsolute(PageSize.A4.getWidth(),100);
	document.add(image);
  }
}