问加密(密码保护)已创建的.xls文件的方法

EN

if(!CSVToEXCEL.pw.equals("NA")){

                if(CSVToEXCEL.oformat.equals("xlsx")){
                    POIFSFileSystem fs = new POIFSFileSystem();
                    EncryptionInfo info = new EncryptionInfo(fs, EncryptionMode.agile);

                    Encryptor enc = info.getEncryptor();
                    enc.confirmPassword(CSVToEXCEL.pw);

                    OPCPackage opc = OPCPackage.open(new File(CSVToEXCEL.opath), PackageAccess.READ_WRITE);
                    OutputStream os = enc.getDataStream(fs);
                    opc.save(os);
                    opc.close();

                    FileOutputStream fos = new FileOutputStream(CSVToEXCEL.opath);
                    fs.writeFilesystem(fos);
                    System.out.println("File created..."+CSVToEXCEL.opath);
                    fos.close();    
            }
                else {
                    // if file is of '.xls' format
                    System.out.println("xls cannot be Encrypted...");
                    ZipAndProtectReport zipAndProtectReport = new ZipAndProtectReport();
                    String xlsoutputzip = zipAndProtectReport.ZipAndProtectMethod(CSVToEXCEL.opath,CSVToEXCEL.pw);
                    System.out.println("Zip Created..... path: "+xlsoutputzip);             
                    }
            }

        else 
            System.out.println("File Created....."+CSVToEXCEL.opath);
    }