Corrected code for page number in pdf

src/main/java/net/gepafin/tendermanagement/dao/PdfPageNumberInserter.java

@@ -0,0 +1,45 @@
+package net.gepafin.tendermanagement.dao;
+import com.itextpdf.text.BaseColor;
+import com.itextpdf.text.DocumentException;
+import com.itextpdf.text.Font;
+import com.itextpdf.text.FontFactory;
+import com.itextpdf.text.pdf.BaseFont;
+import com.itextpdf.text.pdf.PdfReader;
+import com.itextpdf.text.pdf.PdfStamper;
+import com.itextpdf.text.pdf.PdfContentByte;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class PdfPageNumberInserter {
+
+    public static byte[] addPageNumbers(byte[] pdfData) throws IOException, DocumentException {
+        PdfReader reader = new PdfReader(pdfData);  // Read the generated PDF
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        BaseColor darkGreenColor = new BaseColor(1, 50, 32); // Adjust RGB values as needed
+        Font baseFont = FontFactory.getFont(FontFactory.HELVETICA, 4,darkGreenColor);
+        BaseFont font = baseFont.getBaseFont();
+
+        // PdfStamper allows us to modify the existing PDF
+        PdfStamper stamper = new PdfStamper(reader, outputStream);
+        int totalPages = reader.getNumberOfPages();
+
+        // Set the font for page numbers
+
+        for (int i = 1; i <= totalPages; i++) {
+            // Get the content of the current page
+            PdfContentByte over = stamper.getOverContent(i);
+            over.beginText();
+            over.setFontAndSize(font, 12);
+
+            // Add the page number at the bottom center of the page
+            over.showTextAligned(PdfContentByte.ALIGN_CENTER, "Page " + i + " of " + totalPages, 300, 30, 0);
+
+            over.endText();
+        }
+
+        stamper.close();
+        reader.close();
+
+        return outputStream.toByteArray();  // Return the modified PDF with page numbers
+    }
+}