Adding Page Numbers Using PDFBox

Question

How to add page number to page in a document created using PDFBox?

Can someone tell me how to add page numbers to a document after merging different PDF files? I am using the PDFBox library in Java.

This is my code, and it works well, but I need to add a page number.

PDFMergerUtility ut = new PDFMergerUtility(); ut.addSource("c:\\pdf1.pdf"); ut.addSource("c:\\pdf2.pdf"); ut.addSource("c:\\pdf3.pdf"); ut.mergeDocuments(); 

Answer 1

You can see a sample PDFBox AddMessageToEachPage.java . Central code:

 PDDocument doc = null; try { doc = PDDocument.load( file ); List allPages = doc.getDocumentCatalog().getAllPages(); PDFont font = PDType1Font.HELVETICA_BOLD; float fontSize = 36.0f; for( int i=0; i<allPages.size(); i++ ) { PDPage page = (PDPage)allPages.get( i ); PDRectangle pageSize = page.findMediaBox(); float stringWidth = font.getStringWidth( message )*fontSize/1000f; // calculate to center of the page int rotation = page.findRotation(); boolean rotate = rotation == 90 || rotation == 270; float pageWidth = rotate ? pageSize.getHeight() : pageSize.getWidth(); float pageHeight = rotate ? pageSize.getWidth() : pageSize.getHeight(); double centeredXPosition = rotate ? pageHeight/2f : (pageWidth - stringWidth)/2f; double centeredYPosition = rotate ? (pageWidth - stringWidth)/2f : pageHeight/2f; // append the content to the existing stream PDPageContentStream contentStream = new PDPageContentStream(doc, page, true, true,true); contentStream.beginText(); // set font and font size contentStream.setFont( font, fontSize ); // set text color to red contentStream.setNonStrokingColor(255, 0, 0); if (rotate) { // rotate the text according to the page rotation contentStream.setTextRotation(Math.PI/2, centeredXPosition, centeredYPosition); } else { contentStream.setTextTranslation(centeredXPosition, centeredYPosition); } contentStream.drawString( message ); contentStream.endText(); contentStream.close(); } doc.save( outfile ); } finally { if( doc != null ) { doc.close(); } } 

Instead of a message, you can add page numbers. And instead of center you can use any position.