Loading Excel file and saving as signed PDF using JAVA

Aspose.Cells Cloud Product Family
1

Hi,

We are reviewing ASPOSE CELLS for the cloud API & would like to know what is the best way to load excel, upgrade and save it as a signed PDF document.

I have seen in Aspose Cells the ability to add a signature to an excel file, but what about the ability to create signature in pdf document? This is what the example code looks like with the element I would like to achieve:

    Workbook workbook = new Workbook("File.xlsx");

    Worksheet worksheet = workbook.getWorksheets().get(0);

    Cells cells = worksheet.getCells();
    Cell cell = cells.get(1, 1);
    cell.putValue(100);

    workbook.getWorksheets().setActiveSheetIndex(0);
    worksheet.setActiveCell("B2");
    worksheet.setFirstVisibleColumn(1);
    worksheet.setFirstVisibleRow(1);

    String FILE_PATH = "Keystore.pkx";
    DigitalSignatureCollection signatures = new DigitalSignatureCollection();
    InputStream inStream = new FileInputStream(FILE_PATH);
    KeyStore inputKeyStore = KeyStore.getInstance("PKCS12");
    String KEYSTORE_PASSWORD = "password";
    inputKeyStore.load(inStream, KEYSTORE_PASSWORD.toCharArray());
    DigitalSignature signature = new DigitalSignature(inputKeyStore, KEYSTORE_PASSWORD, "test for  sign",
            DateTime.getNow());

    signatures.add(signature);
    workbook.setDigitalSignature(signatures);

    workbook.save("signed_example.pdf", FileFormatType.PDF); // Here I would like save a signed PDF Document

Do I need to use the Aspose PDF library in addition…? If so, is there any way to convert an object of the Workbook class to the (probably) Document class…?

I would be very grateful for your help

Thanks
Patryk

2

@Jarema6,

First, convert an Excel file to a PDF file, and then digitally sign PDF files with PDF libraries.

About Converting Excel to PDF, you can refer to online documents.

3

Thank you very much for your help!

All the best

4

@Jarema6,

Feel free to contact us any time if you have further comments or questions.