带有多个文本元素itext7的事件下划线

import com.itextpdf.kernel.events.*;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Text;

public class UnderlineEvent implements IEventHandler {
    @Override
    public void handleEvent(Event event) {
        PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
        PdfDocument pdfDoc = docEvent.getDocument();
        PdfPage page = docEvent.getPage();
        
        // Create a Document instance
        Document doc = new Document(pdfDoc, page);
        
        // Add multiple text elements with underline
        doc.add(new Paragraph().add(new Text("Text 1").setUnderline()));
        doc.add(new Paragraph().add(new Text("Text 2").setUnderline()));
        doc.add(new Paragraph().add(new Text("Text 3").setUnderline()));
        
        // Close the Document instance
        doc.close();
    }
}

public class Main {
    public static void main(String[] args) {
        try {
            // Create a new PDF document
            PdfDocument pdfDoc = new PdfDocument(new PdfWriter("output.pdf"));
            
            // Add the underline event
            pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, new UnderlineEvent());
            
            // Close the PDF document
            pdfDoc.close();
            
            System.out.println("PDF created successfully.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}