我正在處理一個(gè)用于通過 Adobe AATL 證書簽署 PDF 文件的項(xiàng)目，我正在使用 PDFBOX 庫。我下面的代碼適用于小于 4MB 的文件，并適用于更大的文件。注意：下面的代碼不會(huì)引發(fā)異常。但是，由于完整性問題，它簽名的文件沒有打開。public void signDetached(PDDocument document, File inFile, SignProperties sigProps)        throws IOException {    int accessPermissions = SigUtils.getMDPPermission(document);    if (accessPermissions == 1) {        throw new IllegalStateException("No changes to the document are permitted due to DocMDP transform parameters dictionary");    }    // create signature dictionary    PDSignature signature = new PDSignature();    signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);    signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED);    signature.setName(sigProps.getName());    signature.setLocation(sigProps.getLocation());    signature.setReason(sigProps.getReason());    // the signing date, needed for valid signature    signature.setSignDate(Calendar.getInstance());    // Optional: certify     if (accessPermissions == 0)        SigUtils.setMDPPermission(document, signature, 2);    SignatureOptions signatureOptions = new SignatureOptions();    // Size can vary, but should be enough for purpose.    signatureOptions.setPreferredSignatureSize(SignatureOptions.DEFAULT_SIGNATURE_SIZE * 3);    // register signature dictionary and sign interface    document.addSignature(signature, this, signatureOptions);    FileOutputStream stream = new FileOutputStream(inFile);    // write incremental (only for signing purpose)    document.saveIncremental(stream);    document.close();    stream.close();}更新： PDFBOX 版本是 2.0.8 輸入文件大于 4 MB