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

Answer 2

First,

public boolean isEncrypted(String path) {

    try {
        try {
            new POIFSFileSystem(new FileInputStream(path));
        } catch (IOException ex) {

        }
        System.out.println("protected");
        return true;
    } catch (OfficeXmlFileException e) {
        System.out.println("not protected");
        return false;
    }
}

then,

if (isEncrypted(sourcepath)) {
        org.apache.poi.hssf.record.crypto.Biff8EncryptionKey.setCurrentUserPassword("1234");
        POIFSFileSystem filesystem = new POIFSFileSystem(new FileInputStream(inpFn));
        EncryptionInfo info = new EncryptionInfo(filesystem);
        Decryptor d = Decryptor.getInstance(info);

        if (!d.verifyPassword("1234")) {
            System.out.println("Not good");
        } else {
            System.out.println("Good!");
        }

        in = d.getDataStream(filesystem);
    } else {
        in = new FileInputStream(inpFn);
    }
    try {
        XSSFWorkbook wbIn = new XSSFWorkbook(in);
.
.
.

Answer 3

Try using

XSSFWorkbook wb = new XSSFWorkbook(dataStream);

From Apache POI: "HSSF is the POI Project's pure Java implementation of the Excel '97(-2007) file format. XSSF is the POI Project's pure Java implementation of the Excel 2007 OOXML (.xlsx) file format." http://poi.apache.org/spreadsheet/ You're using the HSSF (which will work for xls) on a XLSX file.