PDFを使用したPDFフォームフィールド

<repositories>
        <repository>
            <id>com.e-iceblue</id>
            <name>e-iceblue</name>
            <url>http://repo.e-iceblue.com/nexus/content/groups/public/</url>
        </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf.free</artifactId>
        <version>3.9.0</version>
    </dependency>
</dependencies>

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.PdfBrushes;
import com.spire.pdf.graphics.PdfCanvas;
import com.spire.pdf.graphics.PdfPen;
import com.spire.pdf.graphics.layer.PdfLayer;

import java.awt.geom.Point2D;

public class AddLayers {
    public static void main(String[] args){
        //Instantiate a PdfDocument object
        PdfDocument pdf = new PdfDocument();
        //Add a page
        PdfPageBase page = pdf.getPages().add();

        //Add 3 layers to the page
        PdfLayer layer = pdf.getLayers().addLayer("red line1");
        PdfCanvas canvas1 = layer.createGraphics(pdf.getPages().get(0).getCanvas());
        canvas1.drawLine(new PdfPen(PdfBrushes.getRed(), 1), new Point2D.Float(50, 350), new Point2D.Float(200, 350));
        layer = pdf.getLayers().addLayer("blue line1");
        PdfCanvas canvas2 = layer.createGraphics(pdf.getPages().get(0).getCanvas());
        canvas2.drawLine(new PdfPen(PdfBrushes.getBlue(), 1), new Point2D.Float(50, 450), new Point2D.Float(200, 450));
        layer = pdf.getLayers().addLayer("green line1");
        PdfCanvas canvas3 = layer.createGraphics(pdf.getPages().get(0).getCanvas());
        canvas3.drawLine(new PdfPen(PdfBrushes.getGreen(), 1), new Point2D.Float(50,550), new Point2D.Float(200, 550));

        //Save the resultant document
        pdf.saveToFile("output/addLayers.pdf");
        pdf.close();
    }
}