java - 使用现有 PDF 作为模板创建具有多个页面的新 PDF

Question

我一直在使用 PDFBox 尝试根据现有模板生成自动生成的 PDF。下面的代码在 finalDoc.save() 处失败，并出现 IndexOutOfBoundsException，我不确定我做错了什么。

PDDocument finalDoc = new PDDocument(); 
for (StudentEN student : students) {
    PDDocument document = PDDocument.load("template.pdf");
    PDPage page = (PDPage) document.getDocumentCatalog().getAllPages().get(0);
    PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true);

    contentStream.beginText();
    // Draw stuff
    contentStream.endText();

    contentStream.close();
    finalDoc.addPage(page);
    document.close();
}

finalDoc.save(response.getOutputStream());
finalDoc.close();

非常感谢任何帮助!

Answer 1

PDFMergerUtility 帮我完成了这项工作:

PDFMergerUtility finalDoc = new PDFMergerUtility(); 
for (StudentEN student : students) {
    PDDocument document = PDDocument.load("template.pdf");
    PDPage page = (PDPage) document.getDocumentCatalog().getAllPages().get(0);
    PDPageContentStream contentStream = new PDPageContentStream(document, page, true, true);

    contentStream.beginText();
    // Draw stuff
    contentStream.endText();

    contentStream.close();

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    document.save(out);
    finalDoc.addSource(new ByteArrayInputStream(out.toByteArray()));
    document.close();
}

response.setContentType("application/pdf");
finalDoc.setDestinationStream(response.getOutputStream());
finalDoc.mergeDocuments();