Spire.PDF for Java 12.6.4 现已正式发布。该版本新增了对 PDF 阅读方向与语言设置的支持，并为 PDF 签名操作提供了更灵活的格式控制能力。此外，两处与签名验证、图像渲染相关的已知问题也已成功被修复。 详情请查阅以下内容。

新功能:

• 支持设置PDF阅读方向与语言。

PdfDocument pdf = new PdfDocument();
pdf.loadFromFile(inputFile);
pdf.getViewerPreferences().setReadingDirection(PdfReadingDirection.LeftToRight);
pdf.setLanguage("zh-CN");
pdf.saveToFile(outputFile , FileFormat.PDF);

• PdfMDPSignatureMaker 新增 IPdfSignatureFormatter 重载，为 PDF 签名操作提供更灵活的格式支持。

PdfDocument document = new PdfDocument();
PdfPageBase pdfPageBase = document.getPages().add();
pdfPageBase.getCanvas().drawString("Hello, World!",
new PdfFont(PdfFontFamily.Helvetica, 30f),
PdfBrushes.getBlack(), 10, 10);

PdfCertificate certificate = new PdfCertificate(path+"gary.pfx", "e-iceblue");
PdfPKCS7Formatter formatter = new PdfPKCS7Formatter(certificate, false);
String timeStampUrl = "https://rfc3161.ai.moda/adobe";
formatter.setTimestampService(new TSAHttpService(timeStampUrl));
formatter.setOCSPService(new OCSPHttpService(null));

PdfMDPSignatureMaker signatureMaker = new PdfMDPSignatureMaker (document, formatter, PdfMDPSignatureMaker.Level2Permissions);
signatureMaker.makeSignature("signName");
com.spire.pdf.interactive.digitalsignatures.PdfSignature signature = signatureMaker.getSignature();
signature.setName("Gary");
// signature.setReason("This is the final version.");
signature.setLocation("U.S.");
signature.setContactInfo("112554");

PdfSignatureAppearance appearance = new PdfSignatureAppearance(signature);
appearance.setNameLabel("Signer: ");
// appearance.setReasonLabel("Reason: ");
appearance.setLocationLabel("Location: ");
appearance.setContactInfoLabel("Phone: ");

PdfImage image = PdfImage.fromFile(path+"logo.png");
appearance.setSignatureImage(image);
appearance.setGraphicMode(GraphicMode.SignImageAndSignDetail);

Rectangle2D rect = new Rectangle2D.Float();
rect.setFrame(new Point2D.Float(90, 550), new Dimension(150, 80));

signatureMaker.makeSignature("Signature", pdfPageBase,
    (float) rect.getMinX(), (float) rect.getMinY(),
    (float) rect.getWidth(), (float) rect.getHeight(),
    appearance);

String output = "signature.pdf";
document.saveToFile(path+output, FileFormat.PDF);
document.close(); 

问题修复:

• 修复了验证签名有效性不准确的问题。
• 修复了绘制图片效果不正确的问题

https://www.e-iceblue.cn/Downloads/Spire-PDF-JAVA.html