import com.spire.pdf.PdfDocument ;
import com.spire.pdf.PdfPageBase ;
import com.spire.pdf.graphics.* ;
import com.spire.pdf.PdfPageSize ;
import com.spire.pdf.graphics.layer.PdfLayer ;import java.awt.* ;
import java.awt.geom.Point2D ;public class AddLayers {public static void main ( String [] args ) throws Exception {//Create a new PDF documentPdfDocument target = new PdfDocument ();//Add a pagePdfPageBase page = target . getPages (). add ();//Load an existing PDF documentPdfDocument pdf = new PdfDocument ();pdf . loadFromFile ( "Instruction.pdf" );//Create a template of the first page in the PDFPdfTemplate template = pdf . getPages (). get ( 0 ). createTemplate ();//Add a layer to the new created PDFPdfLayer layer1 = target . getLayers (). addLayer ( "Layer 1" );PdfCanvas canvas1 = layer1 . createGraphics ( page . getCanvas ());//Draw the template to the layercanvas1 . drawTemplate ( template , new Point2D . Float ( 20 , 50 ), PdfPageSize . A4 );//Add a layer to the new created PDFPdfLayer layer2 = target . getLayers (). addLayer ( "Layer 2" );PdfCanvas canvas2 = layer2 . createGraphics ( page . getCanvas ());//Draw an image to the layercanvas2 . drawImage ( PdfImage . fromFile ( "Hydrangeas.jpg" ), new Point2D . Float ( 330 , 125 ), new Dimension ( 200 , 130 ));//Save the resultant documenttarget . saveToFile ( "result.pdf" );}
}

import com.spire.pdf.PdfDocument ;public class DeleteLayer {public static void main ( String [] args ){//Load the PDFPdfDocument pdf = new PdfDocument ();pdf . loadFromFile ( "result.pdf" );//Remove the layer named "Layer 1" and its content from the PDFpdf . getLayers (). removeLayer ( "Layer 1" , true );//Save the resultant documentpdf . saveToFile ( "deleteLayer.pdf" );pdf . close ();}
}