Add Annotations to PDF using PDFClown API in Java

add-annotations-to-pdf.java

// Import PDF Clown annotation and action classes
import org.pdfclown.documents.Document;
import org.pdfclown.documents.Page;
import org.pdfclown.documents.interaction.annotations.Link;
import org.pdfclown.documents.interaction.actions.GoToURI;
import org.pdfclown.files.File;
import org.pdfclown.documents.interaction.navigation.document.Destination;
import org.pdfclown.documents.interaction.navigation.document.LocalDestination;

import java.awt.geom.Rectangle2D;

public class AddLinkAnnotation {
  public static void main(String[] args) {
    try {
      // 1. Load or create a PDF file
      File pdfFile = new File();
      Document document = pdfFile.getDocument();
      
      // 2. Add a blank page
      Page page = new Page(document);
      document.getPages().add(page);
      
      // 3. Create a link annotation (clickable area)
      Rectangle2D linkBounds = new Rectangle2D.Double(50, 700, 200, 20); // x,y,width,height
      Link link = new Link(page, linkBounds);
      
      // 4. Set the link action (opens a URL)
      GoToURI uriAction = new GoToURI(document, "https://github.com/stefanochizzolini/PDFClown");
      link.setAction(uriAction);
      
      // 5. Add descriptive text near the link
      org.pdfclown.documents.contents.composition.PrimitiveComposer composer
        = new org.pdfclown.documents.contents.composition.PrimitiveComposer(page);
      composer.setFont(
        new org.pdfclown.documents.contents.fonts.StandardType1Font(
          document, 
          org.pdfclown.documents.contents.fonts.StandardType1Font.FamilyEnum.HELVETICA, 
          true, 
          false
        ), 
        12
      );
      composer.showText("Click here to visit PDF Clown GitHub!", new java.awt.geom.Point2D.Double(50, 720));
      composer.flush();
      
      // 6. Save the PDF
      pdfFile.save("link_annotation.pdf");
      System.out.println("PDF with link annotation created successfully!");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}