使用JavaPDFBox将源pdf页面复制（或重复）到另一个pdf中

Question

我有一个模板。有页眉和页脚的pdf（一些文本/图像）。我正在生成一个包含其他数据的新pdf（比如result.pdf）。我需要复制/重复模板。结果的每一页上都有pdf。pdf。所以基本上是模板。pdf将作为结果每页的页眉和页脚。pdf。

问题在于模板。pdf仅显示在结果的第1页。pdf。我的结果。pdf可以是任意“n”个页面。

public class templateTest {

 public static void main(String[] args) throws IOException { 
   File file = new File("template.pdf");
   PDDocument mainDocument = PDDocument.load(file);     

    PDPage myPage = mainDocument.getPage(0);
    PDPageContentStream contentStream = new PDPageContentStream(mainDocument, myPage, AppendMode.APPEND, true);

    contentStream.beginText();
    // Some text
    // Table 1 (Depending on table 1 size, pdf pages will increase) 

    contentStream.endText();
    contentStream.close();

    mainDocument.save("result.pdf");
    mainDocument.close();
 }
}

Answer 1

我已经回答了我自己的问题。蒂尔曼·豪斯赫尔为我指明了正确的方向。

public class templateTest {

 public static void main(String[] args) throws IOException { 

   File file = new File("template.pdf");
   PDDocument templatePdf = PDDocument.load(file);
   PDDocument mainDocument = new PDDocument();     

   PDPage myPage = new PDPage();
    mainDocument.addPage(myPage);
   PDPageContentStream contentStream = new PDPageContentStream(mainDocument, myPage, AppendMode.APPEND, true);

   contentStream.beginText();
   // Some text
  // Table 1 (Depending on table 1 size, pdf pages will increase) 

  contentStream.endText();
  contentStream.close();

  // Process of imposing a layer begins here
  PDPageTree destinationPages = mainDocument.getDocumentCatalog().getPages();

  LayerUtility layerUtility = new LayerUtility(mainDocument);

  PDFormXObject firstForm = layerUtility.importPageAsForm(templatePDF, 0);

  AffineTransform affineTransform = new AffineTransform();

  PDPage destPage = destinationPages.get(0);

  layerUtility.wrapInSaveRestore(destPage);
  layerUtility.appendFormAsLayer(destPage, firstForm, affineTransform, "external page");

  mainDocument.save("result.pdf");
  mainDocument.close();
 }
}