Java：上传文件txt后不保存读取txt内容

InputStream inputStream = file.getInputStream();

InputStreamReader inputStreamReader =new InputStreamReader(inputStream, "utf-8");

BufferedReader bufferedReader =new BufferedReader(inputStreamReader);

while ((txtContent=bufferedReader.readLine())!=null){

    System.out.println("txt内容："+txtContent);

}