在Java中使用Apache POI用密码保护文档

Question

I want to protect a .doc file with password using apache poi. I am getting this error while running code. please help me

Exception in thread "main" org.apache.poi.openxml4j.exceptions.OLE2NotOfficeXmlFileException: The supplied data appears to be in the OLE2 Format. You are calling the part of POI that deals with OOXML (Office Open XML) Documents. You need to call a different part of POI to process this data (eg HSSF instead of XSSF) at org.apache.poi.openxml4j.opc.internal.ZipHelper.verifyZipHeader(ZipHelper.java:179) at org.apache.poi.openxml4j.opc.internal.ZipHelper.openZipFile(ZipHelper.java:237) at org.apache.poi.openxml4j.opc.ZipPackage.(ZipPackage.java:134) at org.apache.poi.openxml4j.opc.ZipPackage.(ZipPackage.java:117) at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:257)

    POIFSFileSystem fs=new POIFSFileSystem();
    EncryptionInfo info=new EncryptionInfo(EncryptionMode.agile);
    Encryptor enc=info.getEncryptor();
    enc.confirmPassword("user");
    OPCPackage opc=OPCPackage.open("D:/Amar.doc", PackageAccess.READ_WRITE);
    OutputStream os=enc.getDataStream(fs);
    opc.save(os);
    opc.close();
    FileOutputStream stream=new FileOutputStream("D:/ao.doc");
    fs.writeFilesystem(stream);
    stream.close();
    System.out.println("running");

Answer 1

I checked and reference to Apache POI documentation , it says that the password encryption for .doc file support since version 3.17, so I give it a try.

It must use HWPFDocument instead to open your doc file. Then you need to set password by:

Biff8EncryptionKey.setCurrentUserPassword(password);

Complete method:

public static void encryptDocFile(File inputDocFile, File outputDocFile, String password) {
    try {
        FileInputStream fileInput = new FileInputStream(inputDocFile);
        BufferedInputStream bufferInput = new BufferedInputStream(fileInput);
        POIFSFileSystem poiFileSystem = new POIFSFileSystem(bufferInput);
        // Setting password
        Biff8EncryptionKey.setCurrentUserPassword(password);

        HWPFDocument wordDoc = new HWPFDocument(poiFileSystem);
        FileOutputStream fileOut = new FileOutputStream(outputDocFile);
        wordDoc.write(fileOut);
        bufferInput.close();
        fileOut.close();
        wordDoc.close();
        System.out.println("Encrypted successfully");
    } catch (IOException e) {
        System.out.println("Failed to encrypt doc file");
        e.printStackTrace();
    }
}

Or you can checkout the complete code here :

If you have further question or feedback, please let me know. Thank you