pdf - Apache PDFBox 和 PDF/A-3

Question

是否可以使用 Apache PDFBox 处理 PDF/A-3 文档？（特别是对于更改字段值？）

PDFBox 1.8 Cookbook说可以创建 PDF/A-1 文档pdfaid.setPart(1);

1. 我可以申请pdfaid.setPart(3)PDF/A-3 文件吗？

2. 如果不是：是否可以读取 PDF/A-3 文档，更改一些字段值并通过我不需要的内容来保护它>创建/转换为 PDF/A-3< 但该文档仍然是 PDF/A -3？

Answer 1

如何创建 PDF/A {2,3} - {B, U, A) 有效：在此示例中，我将 PDF 转换为图像，然后使用图像创建有效的 PDF / Ax-y。PDFBOX2.0x

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

    String resultFile = "result/PDFA-x.PDF";  
    FileInputStream in = new FileInputStream("src/PDFOrigin.PDF");

    PDDocument doc = new PDDocument();
    try 
    {
        PDPage page = new PDPage();
        doc.addPage(page); 
        doc.setVersion(1.7f);

        /*             
        // A PDF/A file needs to have the font embedded if the font is used for text rendering
        // in rendering modes other than text rendering mode 3.
        //
        // This requirement includes the PDF standard fonts, so don't use their static PDFType1Font classes such as
        // PDFType1Font.HELVETICA.
        //
        // As there are many different font licenses it is up to the developer to check if the license terms for the
        // font loaded allows embedding in the PDF.

        String fontfile = "/org/apache/pdfbox/resources/ttf/ArialMT.ttf"; 
        PDFont font = PDType0Font.load(doc, new File(fontfile));           
        if (!font.isEmbedded())
        {
            throw new IllegalStateException("PDF/A compliance requires that all fonts used for"
                    + " text rendering in rendering modes other than rendering mode 3 are embedded.");
        }
      */ 

        PDPageContentStream contents = new PDPageContentStream(doc, page);
        try 
        {   
            PDDocument docSource = PDDocument.load(in);
            PDFRenderer pdfRenderer = new PDFRenderer(docSource);               
            int numPage = 0;

            BufferedImage imagePage = pdfRenderer.renderImageWithDPI(numPage, 200); 
            PDImageXObject pdfXOImage = LosslessFactory.createFromImage(doc, imagePage);

            contents.drawImage(pdfXOImage, 0,0, page.getMediaBox().getWidth(), page.getMediaBox().getHeight());
            contents.close();   

        }catch (Exception e) {
            // TODO: handle exception
        }

        // add XMP metadata
        XMPMetadata xmp = XMPMetadata.createXMPMetadata();
        PDDocumentCatalog catalogue = doc.getDocumentCatalog();
        Calendar cal =  Calendar.getInstance();          

        try
        {
            DublinCoreSchema dc = xmp.createAndAddDublinCoreSchema();
           // dc.setTitle(file);
            dc.addCreator("My APPLICATION Creator");
            dc.addDate(cal);

            PDFAIdentificationSchema id = xmp.createAndAddPFAIdentificationSchema();
            id.setPart(3);  //value => 2|3
            id.setConformance("A"); // value => A|B|U

            XmpSerializer serializer = new XmpSerializer();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            serializer.serialize(xmp, baos, true);

            PDMetadata metadata = new PDMetadata(doc);
            metadata.importXMPMetadata(baos.toByteArray());                
            catalogue.setMetadata(metadata);
        }
        catch(BadFieldValueException e)
        {
            throw new IllegalArgumentException(e);
        }

        // sRGB output intent
        InputStream colorProfile = CreatePDFA.class.getResourceAsStream(
                "../../../pdmodel/sRGB.icc");
        PDOutputIntent intent = new PDOutputIntent(doc, colorProfile);
        intent.setInfo("sRGB IEC61966-2.1");
        intent.setOutputCondition("sRGB IEC61966-2.1");
        intent.setOutputConditionIdentifier("sRGB IEC61966-2.1");
        intent.setRegistryName("http://www.color.org");

        catalogue.addOutputIntent(intent);  
        catalogue.setLanguage("en-US");

        PDViewerPreferences pdViewer =new PDViewerPreferences(page.getCOSObject());
        pdViewer.setDisplayDocTitle(true);; 
        catalogue.setViewerPreferences(pdViewer);

        PDMarkInfo  mark = new PDMarkInfo(); // new PDMarkInfo(page.getCOSObject()); 
        PDStructureTreeRoot treeRoot = new PDStructureTreeRoot(); 
        catalogue.setMarkInfo(mark);
        catalogue.setStructureTreeRoot(treeRoot);           
        catalogue.getMarkInfo().setMarked(true);

        PDDocumentInformation info = doc.getDocumentInformation();               
        info.setCreationDate(cal);
        info.setModificationDate(cal);            
        info.setAuthor("My APPLICATION Author");
        info.setProducer("My APPLICATION Producer");;
        info.setCreator("My APPLICATION Creator");
        info.setTitle("PDF title");
        info.setSubject("PDF to PDF/A{2,3}-{A,U,B}");           

        doc.save(resultFile);
    }catch (Exception e) {
        throw new IllegalArgumentException(e);
    }
}

Answer 2

PDFBox 支持这一点，但请注意，由于 PDFBox 是一个低级库，您必须自己确保一致性，即没有“另存为 PDF/A-3”。您可能想看看http://www.mustangproject.org，它使用 PDFBox 来支持 ZUGFeRD（电子发票），它也需要 PDF/A-3。