eSign Pdf ไฟล์ที่มีลายเซ็น Digital ใน Java

        
// Set up input Pdf file
String filePath = "input.pdf";
// Set up output file
String outputFilePath = "output.pdf";
// Provide digital certificate
String certificateFilePath = "certificate.pfx";

// Instantiate Signature for input file
Signature signature = new Signature(filePath);

//Provide sign options
DigitalSignOptions options = new DigitalSignOptions(certificateFilePath);

// set certificate password
options.setPassword("1234567890");

// set signature position
options.setLeft(50);
options.setTop(200);

// sign Pdf document
SignResult result = signature.sign(outputFilePath, options);