Aspose pdf java PdfFileSignature setAuthority 不工作

Question

我正在尝试使用 Aspose pdf java 对文档进行数字签名。这是我的代码

public ByteArrayOutputStream signDocument(Document doc, String signedBy) throws Exception {

        PdfFileSignature pdfSignSingle = new PdfFileSignature();
        pdfSignSingle.bindPdf(doc);
        pdfSignSingle.setCertificate(prop.getSigningKeyStorePath(), prop.getKeystorePassword());
        PKCS7 signature = new PKCS7(prop.getSigningKeyStorePath(), prop.getKeystorePassword());
        pdfSignSingle.setSignatureAppearance(prop.getSimploudLogo());

        signature.setAuthority("Authority");
        signature.setDate(new Date());
        signature.setContactInfo("email");
        signature.setLocation("Location");
        signature.setReason("reason");
        pdfSignSingle.sign(1, true, new java.awt.Rectangle(100, 100, 200, 200), signature);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        pdfSignSingle.save(baos);
        pdfSignSingle.dispose();
        doc.dispose();
        return baos;
    }

在 picture 中显示签名在 adobeReader 中的外观。

如您所见，图片和权限均未显示。我尝试将图像设为 pdf 和 png 格式。我也试着让它比矩形区域小。至于权威，我真的需要它是可定制的，这样图片中第一行的文字就可以由“customParameter”签名

Answer 1

API 提供了另一个 Class 即 SignatureCustomAppearance 可进一步用于设置签名的此类属性，例如 DateSigned、Reason、Location 等。请检查以下内容可以满足您要求的完整代码段：

String inputFile = "doc.pdf";
String outSignedFile = "out_20.9.pdf";
// Create PdfFileSignature instance
com.aspose.pdf.facades.PdfFileSignature pdfSignSingle = new com.aspose.pdf.facades.PdfFileSignature();
// Bind the source PDF by reading contents of Stream
pdfSignSingle.bindPdf(inputFile);

PKCS7 pkcs = new PKCS7("mykey2.pfx", "pass");
pkcs.setAuthority("Authority");
pkcs.setDate(new Date());
pkcs.setContactInfo("email");
pkcs.setLocation("Location");
pkcs.setReason("reason");
pkcs.setImage(new FileInputStream("simpleLogo.png"));

SignatureCustomAppearance sca = new SignatureCustomAppearance();
sca.setDateSignedAtLabel(null);
sca.setDigitalSignedLabel(null);
sca.setShowReason(true);
sca.setShowLocation(true);
sca.setShowContactInfo(true);

pkcs.setCustomAppearance(sca);

pdfSignSingle.sign(1, true, new java.awt.Rectangle(100, 100, 200, 200), pkcs);
// Set image for signature appearance
//pdfSignSingle.setSignatureAppearance("simpleLogo.png");
// Save final output
pdfSignSingle.save(outSignedFile);

正如问题下方的评论所述，Aspose.PDF 官方论坛和“Aspose pdf java PdfFileSignature setAuthority not working”也发布了相同的查询，并且那里也提供了解决方案。

Aspose pdf java PdfFileSignature setAuthority 不工作

Aspose pdf java PdfFileSignature setAuthority not working

java

pdf

digital-signature

aspose