使用PDFBox添加页码

如何将页码添加到使用PDFBox生成的文档中的页面?

合并不同的PDF后,有人能告诉我如何在文档中添加页码吗? 我在Java中使用PDFBox库。

这是我的代码,它运行良好,但我需要添加页码。

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

您可能需要查看PDFBox示例AddMessageToEachPage.java 。 中央代码是:

 try (PDDocument doc = PDDocument.load(new File(file))) { PDFont font = PDType1Font.HELVETICA_BOLD; float fontSize = 36.0f; for( PDPage page : doc.getPages() ) { PDRectangle pageSize = page.getMediaBox(); float stringWidth = font.getStringWidth( message )*fontSize/1000f; // calculate to center of the page int rotation = page.getRotation(); boolean rotate = rotation == 90 || rotation == 270; float pageWidth = rotate ? pageSize.getHeight() : pageSize.getWidth(); float pageHeight = rotate ? pageSize.getWidth() : pageSize.getHeight(); float centerX = rotate ? pageHeight/2f : (pageWidth - stringWidth)/2f; float centerY = rotate ? (pageWidth - stringWidth)/2f : pageHeight/2f; // append the content to the existing stream try (PDPageContentStream contentStream = new PDPageContentStream(doc, page, AppendMode.APPEND, 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.setTextMatrix(Matrix.getRotateInstance(Math.PI / 2, centerX, centerY)); } else { contentStream.setTextMatrix(Matrix.getTranslateInstance(centerX, centerY)); } contentStream.showText(message); contentStream.endText(); } } doc.save( outfile ); } 

1.8.x吊坠是:

 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 

您可以添加页码,而不是消息。 而不是中心,你可以使用任何位置。

(但是可以改进示例: MediaBox是错误的选择,应该使用CropBox ,并且页面旋转处理只能正确处理0°和90°; 180°和270°会产生颠倒的写入。)

这很简单,请尝试以下代码

 public static void addPageNumbers(PDDocument document, String numberingFormat, int offset_X, int offset_Y) throws IOException { int page_counter = 1; for(PDPage page : document.getPages()){ PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true, false); contentStream.beginText(); contentStream.setFont(PDType1Font.TIMES_ITALIC, 10); PDRectangle pageSize = page.getMediaBox(); float x = pageSize.getLowerLeftX(); float y = pageSize.getLowerLeftY(); contentStream.newLineAtOffset(x+ pageSize.getWidth()-offset_X, y+offset_Y); String text = MessageFormat.format(numberingFormat,page_counter); contentStream.showText(text); contentStream.endText(); contentStream.close(); ++page_counter; } } public static void main(String[] args) throws Exception { File file = new File("your input pdf path"); PDDocument document = PDDocument.load(file); addPageNumbers(document,"Page {0}",60,18); document.save(new File("output pdf path")); document.close(); }