import com.spire.xls.*;
import com.spire.xls.digital.CertificateAndPrivateKey;
import java.util.Date;

public class AddSignature {
  public static void main(String[] args) throws Exception {
    //加載Excel工作簿
    Workbook wb = new Workbook();
    wb.loadFromFile("test.xlsx");

    //添加數(shù)字簽名
    wb.addDigitalSignature(new CertificateAndPrivateKey("cer.pfx","123654yes!"), "The Author is Mia",new Date());
    
    //保存文檔
    wb.saveToFile("AddSignature.xlsx",ExcelVersion.Version2013);
    wb.dispose();
  }
}

import com.spire.xls.*;
public class DetectSignature {
  public static void main(String[] args) {
    //加載Excel工作簿
    Workbook wb = new Workbook();
    wb.loadFromFile("AddSignature.xlsx");

    //判斷文檔是否簽名
    boolean signature = wb.isDigitallySigned();
    if(signature==true)
    {
      System.out.println("文檔已簽名！");
    }
    else
      {
        System.out.println("未簽名文檔！");
      }
  }
}

import com.spire.xls.*;

public class RemoveSignature {
  public static void main(String[] args) {
    //加載Excel工作簿
    Workbook wb = new Workbook();
    wb.loadFromFile("AddSignature.xlsx");

    //刪除簽名
    wb.removeAllDigitalSignatures();

    //保存文檔
    wb.saveToFile("RemoveSignature.xlsx",ExcelVersion.Version2013);
    wb.dispose();
  }
}