Question

我正在尝试从用密码加密的xlsm Excel文件中读取数据到目前为止，我在Apache POI网站上找到的方法和堆栈溢出都没有成功这是我到目前为止所尝试的，以及我得到的例外：

    String fileName = "C:\\encryptedExcel.xlsm";
    String password = "passcode!";

        try {
            // XOR/RC4 decryption for xls
            Biff8EncryptionKey.setCurrentUserPassword(password);
            NPOIFSFileSystem fs = new NPOIFSFileSystem(new File(fileName), true);           
            HSSFWorkbook hwb = new HSSFWorkbook(fs.getRoot(), true);
        }
        catch(Exception e) {e.printStackTrace();System.err.println(e);}
        //org.apache.poi.EncryptedDocumentException: The supplied spreadsheet seems to be an Encrypted .xlsx file. It must be decrypted before use by XSSF, it cannot be used by HSSF


        try {
            Biff8EncryptionKey.setCurrentUserPassword(password);            
            Workbook workbook = new XSSFWorkbook(OPCPackage.open(fileName,PackageAccess.READ));
            Biff8EncryptionKey.setCurrentUserPassword(null);
        }
        catch(Exception e) {e.printStackTrace();System.err.println(e);}
        //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)  

        try {
            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(fileName));
            //if (!bis.markSupported()) {is = new PushbackInputStream(bis, 8);}
            if (POIFSFileSystem.hasPOIFSHeader(bis)) {
                POIFSFileSystem fs = new POIFSFileSystem(bis);
                EncryptionInfo info = new EncryptionInfo(fs);
                Decryptor d = Decryptor.getInstance(info);
                d.verifyPassword(password);
                //is = d.getDataStream(fs);
            }
        }
        catch(Exception e) {e.printStackTrace();}
        //throws java.io.IOException: getFileMagic() only operates on streams which support mark(int)
        //fixed by converting to BufferedInputStream
        //then throws org.apache.poi.EncryptedDocumentException: Export Restrictions in place - please install JCE Unlimited Strength Jurisdiction Policy files


        try {
            File input = new File(fileName);
            Workbook wb = WorkbookFactory.create(input, password);
        }
        catch(Exception e) {e.printStackTrace();System.err.println(e);}
        //org.apache.poi.EncryptedDocumentException: Export Restrictions in place - please install JCE Unlimited Strength Jurisdiction Policy files

Answer 1

宣传回答评论......

首先，您应该使用WorkbookFactory.create method which takes a password，让Apache POI为您检测类型和设置解密的所有艰苦工作，例如

Workbook wb = WorkbookFactory.create(new File("protected.xlsx"),"SecurePassword);

其次，到目前为止，您工作中的关键错误信息是：

org.apache.poi.EncryptedDocumentException: Export Restrictions in place - please install JCE Unlimited Strength Jurisdiction Policy files

这告诉你，你有一个nobbled / hobbled /故意部分破解的JVM安装，缺乏足够的加密支持来解密你已经获得的文件。正如错误所解释的那样，您需要从JVM提供程序获取JVM的无限强度JCE文件，并将它们安装到您的所有Java安装中，以使用足够强大的加密来匹配Excel使用的

此外，Apache POI page on Encryption and Decryption也可能派上用场了！

如何从xlsm加密文件中读取？

1 个答案: