Java/PDF RTF/Document Page Event

Document Page Event: document open, close, page start and end

import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.Image;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfGState;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;
public class DocumentPageEventPDF extends PdfPageEventHelper {
  public Image headerImage;
  public PdfPTable table;
  public PdfGState gstate;
  public PdfTemplate tpl;
  public BaseFont helv;
  public static void main(String args[]) {
    try {
      Document doc = new Document(PageSize.A4, 50, 50, 100, 72);
      PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream("DocumentPageEventPDF.pdf"));
      writer.setPageEvent(new DocumentPageEventPDF());
      doc.open();
      Paragraph p = new Paragraph("text");
      doc.add(p);
      doc.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  public void onOpenDocument(PdfWriter writer, Document document) {
    System.out.println("onOpenDocument");
  }
  public void onEndPage(PdfWriter writer, Document document) {
    System.out.println("onEndPage");
  }
  public void onStartPage(PdfWriter writer, Document document) {
    System.out.println("onStartPage");
  }
  public void onCloseDocument(PdfWriter writer, Document document) {
    System.out.println("onCloseDocument");
  }
}

PdfEvents: on generic tags, on chapter

import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfWriter;
public class PdfEvents {
  public static void main(String[] args) {
    Document document = new Document(PageSize.A4, 80, 50, 30, 65);
    try {
      
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("PdfEvents.pdf"));
      document.open();
      writer.setPageEvent(new MyPageEvents());
      document.newPage();
      document.add(new Paragraph("Text"));
      document.close();
    } catch (Exception e) {
      System.err.println(e.getMessage());
    }
  }
}
class MyPageEvents extends PdfPageEventHelper {
  
  public void onGenericTag(PdfWriter writer, Document document,  Rectangle rect, String text) {
    System.out.println("onGenericTag");
    
  }
  public void onOpenDocument(PdfWriter writer, Document document) {
    System.out.println("onOpenDocument");
  }
  public void onChapter(PdfWriter writer, Document document, float paragraphPosition, Paragraph title) {
    System.out.println("onChapter");
  }
  public void onEndPage(PdfWriter writer, Document document) {
    System.out.println("onEndPage");
  }
  public void onCloseDocument(PdfWriter writer, Document document) {
    System.out.println("onCloseDocument");
  }
}

PdfPageEvent: on Paragraph

import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.Font;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfDestination;
import com.lowagie.text.pdf.PdfOutline;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfWriter;
public class OnParagraphEventPDF extends PdfPageEventHelper {
    public void onParagraph(PdfWriter writer, Document document, float position) {
      System.out.println("onParagraph");
    }
  public static void main(String[] args) {
    Document document = new Document(PageSize.A6);
    try {
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("OnParagraphEventPDF.pdf"));
      writer.setViewerPreferences(PdfWriter.PageModeUseOutlines);
      document.open();
      writer.setPageEvent(new OnParagraphEventPDF());
            
      document.add(new Paragraph("Text.", new Font(Font.HELVETICA, 12)));
      document.add(new Paragraph("Text.", new Font(Font.HELVETICA, 12)));
      document.add(new Paragraph("Text.", new Font(Font.HELVETICA, 12)));
      document.add(new Paragraph("Text.", new Font(Font.HELVETICA, 12)));
      document.add(new Paragraph("Text.", new Font(Font.HELVETICA, 12)));
    } catch (Exception de) {
      de.printStackTrace();
    }
    document.close();
  }
}

PdfPageEvent: page end

import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfWriter;
public class OnEndPageEventPDF extends PdfPageEventHelper {
    public static void main(String[] args)
    {
        Document document = new Document(PageSize.A4, 50, 50, 70, 70);
        try {
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("OnEndPageEventPDF.pdf"));
            writer.setPageEvent(new OnEndPageEventPDF());
            document.open();
            
            document.add(new Paragraph("text"));
            document.close();
        }
        catch (Exception de) {
            de.printStackTrace();
        }
    }
    
    public void onEndPage(PdfWriter writer, Document document) {
       System.out.println("on page end event call back");
    }
}

Using Pdf event to build the Pdf document

import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfWriter;
public class PdfPageEventHelperDemo extends PdfPageEventHelper {
  public void onGenericTag(PdfWriter writer, Document document, Rectangle rect, String text) {
    if ("text".equals(text)) {
      PdfContentByte cb = writer.getDirectContent();
      cb.ellipse(rect.left(), rect.bottom() - 5f, rect.right(), rect.top());
      cb.stroke();
    }
  }
  public static void main(String[] args) {
    Document document = new Document();
    try {
      PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("PdfPageEventHelperDemo.pdf"));
      writer.setPageEvent(new PdfPageEventHelperDemo());
      document.open();
      Paragraph p = new Paragraph("Generic page event");
      document.add(p);
      
      Chunk box = new Chunk("text");
      box.setGenericTag("text");
      
      p.add(box);
      document.add(p);
    } catch (Exception e) {
      System.err.println(e.getMessage());
    }
    document.close();
  }
}