在java中使用Apache POI使用密码保护文档

Question

    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

我查看并参考了Apache POI文档，它说.doc文件的密码加密从3.17版本开始就支持了，所以我试了一下。

它必须使用hwpfdocument来打开文档文件。则需要通过以下方式设置密码：

Biff8EncryptionKey.setCurrentUserPassword(password);

完成方法：

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();
    }
}