java - PDFBox在创建文档时添加背景

Question

所以我不仅想在创建 pdf 时添加文本，还想同时添加背景图像。我想知道这是否可能，因为我找不到任何示例，并且与此类似的唯一问题( This one )没有给出提出问题的人的任何反馈，并且没有标记为已解决.

我现在正在使用这个非常简单的示例:

       PDDocument doc = null;
       PDPage page = null;

       try{
           doc = new PDDocument();
           page = new PDPage();

           doc.addPage(page);
           PDFont font = PDType1Font.HELVETICA_BOLD;

           PDPageContentStream content = new PDPageContentStream(doc, page);
           content.beginText();
           content.setFont( font, 12 );
           content.moveTextPositionByAmount( 100, 700 );
           content.drawString("Hello World");

           content.endText();
           content.close();
           doc.save("printme.pdf");
           doc.close();
       } catch (Exception e){
           System.out.println(e);
       }

感谢您的宝贵时间。

Answer 1

try {
        PDDocument document = new PDDocument();
        PDPage page = new PDPage(PDPage.PAGE_SIZE_A4);
        document.addPage(page);
        PDFont font = PDType1Font.HELVETICA_BOLD;
        PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true);
        addImageToPage(document, 0, 0, 4f, "D:/test.jpg", contentStream);
        contentStream.beginText();
        contentStream.setFont(font, 12);
        contentStream.moveTextPositionByAmount(100, 700);
        contentStream.drawString("Hello World");
        contentStream.endText();
        contentStream.close();
        document.save("D:/mydoc.pdf");
    } catch (Exception e) {
        System.out.println(e);
    }

添加图片的方法:

public static void addImageToPage(PDDocument document, int x, int y, float scale, String imageFilePath, PDPageContentStream contentStream)
        throws IOException {
    BufferedImage tmp_image = ImageIO.read(new File(imageFilePath));
    BufferedImage image = new BufferedImage(tmp_image.getWidth(), tmp_image.getHeight(),
            BufferedImage.TYPE_4BYTE_ABGR);
    image.createGraphics().drawRenderedImage(tmp_image, null);
    PDXObjectImage ximage = new PDPixelMap(document, image);
    contentStream.drawXObject(ximage, x, y, ximage.getWidth() * scale, ximage.getHeight() * scale);
}