Java PDFBox-从页面中删除图像，并在不同位置添加相同的图像

我正在使用PDFBox 2.x版本，需要重新定位页面中的现有图像。为此，我将从页面中删除图像，然后重新添加。但是，在我当前的实现中，这两种图像都没有显示

请帮我解决这个问题，让我知道哪里出了问题

try {
  PDDocument document = PDDocument.load(new File("..\\sampleWithImage_with_barcode_img.pdf"));

  PDDocument newDocument = new PDDocument();
  for (int i = 0; i < document.getNumberOfPages(); i++) {
    PDPage sourcePage = document.getPage(i);
    PDPage pdPage = newDocument.importPage(sourcePage);
    pdPage.setResources(sourcePage.getResources());

    //To remove existing from the page
    stripUnusedImages(pdPage, newDocument);

    //ADD OTHER IMAGE
    PDImageXObject pdImage = PDImageXObject.createFromFile("D:\\copy\\pic.jpg", newDocument);

    PDPageContentStream contents = new PDPageContentStream(newDocument, pdPage,
      PDPageContentStream.AppendMode.APPEND, true);

    // Drawing the image in the PDF document
    contents.drawImage(pdImage, 0, 0, 50, 30);

    System.out.println("Image inserted Successfully.");

    // Closing the PDPageContentStream object
    contents.close();
  }
  newDocument.save("..\\RemovedImage.pdf");
  document.close();
  newDocument.close();

} catch (Exception e) {
  e.printStackTrace();
}

//Method to remove image
protected void stripUnusedImages(PDPage page, PDDocument document) throws IOException, XmpParsingException {
  PDResources resources = copyResources(page);
  PDFStreamParser parser = new PDFStreamParser(page);
  parser.parse();

  List < Object > tokens = parser.getTokens();
  System.out.println("Total Tokens=" + tokens.size());
  List < Object > newTokens = new ArrayList < Object > ();
  for (int j = 0; j < tokens.size(); j++) {
    Object token = tokens.get(j);
    if (token instanceof COSName) {
      COSName cosname = (COSName) token;
      PDXObject o = resources.getXObject(cosname);
      if (o instanceof PDImageXObject) {
        PDImageXObject pdImageXObject = (PDImageXObject) o;
        if (pdImageXObject.getMetadata() != null) {
          System.out.println("pdImageXObjec metadata exist");
          newTokens.remove(newTokens.size() - 1);
          continue;
        }
      }
    }

    newTokens.add(token);
  }

  PDStream newContents = new PDStream(document);
  OutputStream outputStream = newContents.createOutputStream();
  ContentStreamWriter writer = new ContentStreamWriter(outputStream);
  writer.writeTokens(newTokens);
  outputStream.close();
  newContents.addCompression();
  page.setContents(newContents);
}

试试看{
PDDocument document=PDDocument.load（新文件（“..\\sampleWithImage\u with\u barcode\u img.pdf”）；
PDDocument newDocument=新PDDocument（）；
对于（int i=0；itokens=parser.getTokens（）；
System.out.println（“Total Tokens=“+Tokens.size（））；
List