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我必须使用带有附件的 iText 创建 PDF/A-3-B（ISO 19005-3:2012。第 3 部分）。

如何在 PDF 的文档目录中创建 AF 条目？

我在这个问题的末尾使用了 Java 代码来生成模拟测试。使用 Adob​​e XI Pro Preflight，我看到 PDF 的结构变成了这样：

The document catalog root
   AF:
      0: (6)   /T:FileSpec

但结构应该是：

The document catalog root
   AF:
      0: (6) [6 0 R]   /T:FileSpec

换句话说，我认为 AF 条目应该是指向附件本身的指针。

ISO 说：

KEY:   AF
TYPE:  array of dictionaries
Value: (Optional) An array of File Specification Dictionaries 
       representing the source content from which this document is 
       derived or data used to produce the visual representation.

可用于生成示例的模拟 Java 代码如下：

public static final String RESULT = "target/pdfa3.pdf";
public static final String FONTPATH = "/usr/share/fonts/truetype/msttcorefonts/times.ttf";
private static Font FONT = FontFactory.getFont(FONTPATH, BaseFont.CP1252, BaseFont.EMBEDDED);

public void test(){
   //creating document
   Document document = new Document();
   PdfAWriter writer = PdfAWriter.getInstance(document, new FileOutputStream(RESULT), PdfAConformanceLevel.PDF_A_3B);

   //creating default Xmp
   writer.createXmpMetadata();

   document.open();

   //adding attachment as embedded file
   PdfDictionary fileParameter = new PdfDictionary();
   fileParameter.put(new PdfName("ModDate"), new PdfString("2013-01-09T16:28-02:00"));
   PdfFileSpecification fs = PdfFileSpecification.fileEmbedded(writer, src.getAbsolutePath(), src.getName(), null, false, "image/jpeg", fileParameter);
   fs.put(new PdfName("AFRelationship"), new PdfName("Source"));
   writer.addFileAttachment(src.getName().substring(0, src.getName().indexOf('.')), fs);

   //???????????????????
   //THIS IS THE POINT: HOW TO ADD AN AF ENTRY?
   //this does not work:
   writer.getExtraCatalog().put(new PdfName("AF"), new PdfArray(fs));
   //???????????????????

   //adding some text
   document.add(new Paragraph("Hello World!", FONT));

   //done!
   document.close();
}
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