如何批量给Excel文件添加数字签名？

public void AddSignature() {
    Workbook wb = new Workbook();
    ISignature signature = wb.getSignatures().addSignatureLine(wb.getActiveSheet(), 100, 50);

    ISignatureSetup setup = signature.getSetup();
    setup.setShowSignDate(false);
    setup.setAllowComments(false);
    setup.setSigningInstructions("Please check the content before signing");
    setup.setSuggestedSignerEmail("example@example.com");
    setup.setSuggestedSignerLine2("Commander (Balanced)");

    wb.save("output/SignatureLines.xlsx");
}

参考资料：https://www.grapecity.com.cn/developer/grapecitydocuments/exc...