Add Page Numbers to an existing PDF Document using Java

import com.spire.pdf.PdfDocument;
import com.spire.pdf.automaticfields.PdfCompositeField;
import com.spire.pdf.automaticfields.PdfPageCountField;
import com.spire.pdf.automaticfields.PdfPageNumberField;

import java.awt.*;
import java.awt.geom.Dimension2D;
import java.awt.geom.Rectangle2D;

public class AddPageNumbers {

public static void main(String[] args) {

//load a PDF document
PdfDocument doc = new PdfDocument();

//create a true type font
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Times New Roman", Font.PLAIN, 12));

//get the page size
Dimension2D pageSize = doc.getPages().get(0).getSize();

//declare a float variable
float y = (float) pageSize.getHeight() - 72;

//loop through the pages
for (int i = 0; i < doc.getPages().getCount(); i++) {

//initialize PdfPageNumberField instance
PdfPageNumberField number = new PdfPageNumberField();

//initialize PdfPageCountField instance
PdfPageCountField count = new PdfPageCountField();

//create PdfCompositeField instance
PdfCompositeField compositeField = new PdfCompositeField(font, PdfBrushes.getBlack(), "Page {0} of {1}", number, count);

//set the text alignment within the composite field
compositeField.setStringFormat(new PdfStringFormat(PdfTextAlignment.Right, PdfVerticalAlignment.Top));

//get the text size
Dimension2D textSize = font.measureString(compositeField.getText());

//set the position and size of composite field
compositeField.setBounds(new Rectangle2D.Float((float) pageSize.getWidth() - (float) textSize.getWidth() - 80, y, (float) textSize.getWidth(), (float) textSize.getHeight()));

//draw composite filed on PDF page

//save to another file



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