代码报错import dartconvert;import packagefluttermaterialdart;import packagediodiodart;class StreamTextPage extends StatefulWidget override _StreamTextPageState createState = _StreamTextPageState;class

将 _getTextStream() 方法的返回值改为 Stream<Uint8List>。修改后的代码如下：

Stream<Uint8List> _getTextStream() async* {
  final dio = Dio();
  final response = await dio.get(
      'http://127.0.0.1:9000/?content=%E7%BB%99%E6%88%91%E5%86%99%E4%B8%80%E7%AF%87300%E5%AD%97%E7%9A%84%E6%96%87%E7%AB%A0%EF%BC%8C%E5%85%B3%E4%BA%8E%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD',
      options: Options(responseType: ResponseType.stream));

  yield* response.data.stream();
}

同时，需要将 utf8.decode(data) 改为 String.fromCharCodes(data)，如下：

_getTextStream().listen((data) {
  setState(() {
    _text = String.fromCharCodes(data);
  });
});
``