把流轉換成string

 private String streamTostring(InputStream inputStream){
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        String str;
        StringBuilder stringBuilder = new StringBuilder();
        try {
            while ((str=bufferedReader.readLine())!=null){
                stringBuilder.append(str);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  stringBuilder.toString();

}