How to check if xlsx file is password protected or not using apache poi

Question

How to check if xlsx file is password protected or not. we can check for xls file as follows

FileInputStream fin = new FileInputStream(new File(\"C:/Book1.xl         


        

Answer 1

If you don't know what you have, but you know the password, then you should use WorkbookFactory.create and pass the password to it, eg

Workbook wb = WorkbookFactory.create(new File("protected.xls"),
                                     "NiceSecurePassword");

WorkbookFactory will identify the type, then call the appropriate decryption and workbook loading for you. If the file isn't protected, the password will be ignored

.

If you know for sure that the file is .xlsx based, but aren't sure if it is protected or not, then you can do something like:

Workbook wb = null;
try {
   wb = new XSSFWorkbook(new File("test.xlsx"));
} catch (EncryptedDocumentException e) {
   // Password protected, try to decrypt and load
}

If you give the XSSFWorkbook a password protected .xlsx file, it'll throw a EncryptedDocumentException which you can catch and then try decrypting, based on the code you've already got