Update a Pdf document : Introduction « PDF « Java Tutorial

1. Java Tutorial
2. PDF
3. Introduction

import java.io.FileOutputStream;

import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfStamper;
import com.lowagie.text.pdf.PdfWriter;

public class MainClass {

  public static void main(String[] args) throws Exception {
    Document.compress = false;
    Document document = new Document();
    PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));
    document.open();
    document.add(new Paragraph("Hello World"));
    document.close();

    PdfReader reader = new PdfReader("HelloWorld.pdf");
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("updated.pdf"), '\0', true);
    PdfContentByte cb = stamper.getOverContent(1);
    cb.beginText();
    cb.showTextAligned(Element.ALIGN_LEFT, "Hello People", 36, 770, 0);
    cb.endText();
    stamper.close();

  }
}