Question

我想从html生成一个pdf并在其中包含签名块。 html可以是任何格式，但有时可能是1页，有时可能是50页。签名将是页面上的唯一输入。 html的一个例子可能是。

<div>
    <input type="text" />
</div>

有谁知道怎么做？我目前正在使用ItextSharp生成pdf。

Answer 1

技术组合将产生您想要的结果。

使用pdfHTML（iText7插件）将HTML（HTML5 + CSS3）转换为PDF
您可以为这些代码添加自定义代码和处理程序。您可以创建一个注入签名表单域
使用iText对PDF文档进行数字签名

数字签名的简短示例：

public void sign(String src, String dest,
             Certificate[] chain,
             PrivateKey pk, String digestAlgorithm, String provider,
             PdfSigner.CryptoStandard subfilter,
             String reason, String location)
    throws GeneralSecurityException, IOException {
// Creating the reader and the signer
PdfReader reader = new PdfReader(src);
PdfSigner signer = new PdfSigner(reader, new FileOutputStream(dest), false);
// Creating the appearance
PdfSignatureAppearance appearance = signer.getSignatureAppearance()
        .setReason(reason)
        .setLocation(location)
        .setReuseAppearance(false);
Rectangle rect = new Rectangle(36, 648, 200, 100);
appearance
        .setPageRect(rect)
        .setPageNumber(1);
signer.setFieldName("sig");
// Creating the signature
IExternalSignature pks = new PrivateKeySignature(pk, digestAlgorithm, provider);
IExternalDigest digest = new BouncyCastleDigest();
signer.signDetached(digest, pks, chain, null, null, null, 0, subfilter);
}

pdfHTML的简短示例：

public void createPdf(String src, String dest, String resources) throws IOException {
    try {
        FileOutputStream outputStream = new FileOutputStream(dest);

        WriterProperties writerProperties = new WriterProperties();
        //Add metadata
        writerProperties.addXmpMetadata();

        PdfWriter pdfWriter = new PdfWriter(outputStream, writerProperties);

        PdfDocument pdfDoc = new PdfDocument(pdfWriter);
        pdfDoc.getCatalog().setLang(new PdfString("en-US"));
        //Set the document to be tagged
        pdfDoc.setTagged();
        pdfDoc.getCatalog().setViewerPreferences(new PdfViewerPreferences().setDisplayDocTitle(true));

        //Set meta tags
        PdfDocumentInfo pdfMetaData = pdfDoc.getDocumentInfo();
        pdfMetaData.setAuthor("Samuel Huylebroeck");
        pdfMetaData.addCreationDate();
        pdfMetaData.getProducer();
        pdfMetaData.setCreator("iText Software");
        pdfMetaData.setKeywords("example, accessibility");
        pdfMetaData.setSubject("PDF accessibility");
        //Title is derived from html

        // pdf conversion
        ConverterProperties props = new ConverterProperties();
        FontProvider fp = new FontProvider();
        fp.addStandardPdfFonts();
        fp.addDirectory(resources);//The noto-nashk font file (.ttf extension) is placed in the resources

        props.setFontProvider(fp);
        props.setBaseUri(resources);
        //Setup custom tagworker factory for better tagging of headers
        DefaultTagWorkerFactory tagWorkerFactory = new AccessibilityTagWorkerFactory();
        props.setTagWorkerFactory(tagWorkerFactory);

        HtmlConverter.convertToPdf(new FileInputStream(src), pdfDoc, props);
        pdfDoc.close();

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

http://itextpdf.com/itext7/pdfHTML

ItextSharp html to pdf with signature

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