import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfMargins;
import com.spire.pdf.graphics.PdfTemplate;

import java.awt.geom.Dimension2D;
import java.awt.geom.Point2D;

public class DuplicatePage {

    public static void main(String[] args) {

        //Load a sample PDF document
        PdfDocument pdf = new PdfDocument("C:\\Users\\Administrator\\Desktop\\original.pdf");

        //Get the first page
        PdfPageBase page = pdf.getPages().get(0);

        //Get the page size
        Dimension2D size = page.getActualSize();

        //Create a template based on the page
        PdfTemplate template = page.createTemplate();

        for (int i = 0; i < 10; i++) {

            //Add a new page to the document
            page = pdf.getPages().add(size, new PdfMargins(0));

            //Draw template on the new page
            page.getCanvas().drawTemplate(template, new Point2D.Float(0, 0));
        }

        //Save the file
        pdf.saveToFile("output/DuplicatePage.pdf");
    }
}