Tilldela och validera digitala signaturer

Att signera kalkylbladen kräver ett certifikat som diskuterats ovan. Tillsammans med certifikatet bör man också ha dess lösenord för att framgångsrikt signera kalkylbladen med hjälp av Aspose.Cells API.

Följande kodsnutt demonstrerar användningen av Aspose.Cells for Java API för att signera en kalkylblad.

Följande kodsnutt visar användningen av Aspose.Cells for Java API för att signera ett kalkylblad.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir(SigningSpreadsheets.class);
// Create an instance of DigitalSignatureCollection
DigitalSignatureCollection signatures = new DigitalSignatureCollection();
// Load the certificate into an instance of InputStream
InputStream inStream = new FileInputStream("d:/temp.pfx");
// Create an instance of KeyStore with PKCS12 cryptography
KeyStore inputKeyStore = KeyStore.getInstance("PKCS12");
// Use the KeyStore.load method to load the certificate stream and its password
inputKeyStore.load(inStream, KEYSTORE_PASSWORD.toCharArray());
// Create an instance of DigitalSignature and pass the instance of KeyStore, password, comments and time
DigitalSignature signature = new DigitalSignature(inputKeyStore, KEYSTORE_PASSWORD, "test for sign",
DateTime.getNow());
// Add the instance of DigitalSignature into the collection
signatures.add(signature);
// Load an existing spreadsheet using the Workbook class
Workbook workbook = new Workbook(dataDir + "unsigned.xlsx");
// Set the signature
workbook.setDigitalSignature(signatures);
// Save the signed spreadsheet
workbook.save(dataDir + "signed.xlsx");

Validering av kalkylblad

Följande kodsnutt visar användningen av Aspose.Cells for Java API för att validera kalkylarket.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir(ValidatingSpreadsheets.class);
// Load an existing spreadsheet in an instance of Workbook
Workbook workbook = new Workbook(dataDir + "signed.xlsx");
// Retrieve the collection of digital signatures from the Workbook
DigitalSignatureCollection signatures = workbook.getDigitalSignature();
// Loop over the collection of digital signatures
for (DigitalSignature signature : (Iterable<DigitalSignature>) signatures) {
// Check the signature status using the isValid property
System.out.println(signature.isValid());
}