Flutter 代码优化：抽取公共部分和网络请求

//抽取网络请求到api_service部分 static Future getRequest(String url, {ResponseType type = ResponseType.json}) async { Dio dio = Dio(); Response response = await dio.get(url, options: Options(responseType: type)); return response; }

//抽取获取验证码的方法 static Future getVerifyCode(context, setState) async { print(_pureyzm.toString()); if (!_pureyzm) { Response response = await ApiService.getRequest('https://nepuback-nepu-restart-xbbhhovrls.cn-beijing.fcapp.run/jwc_login', type: ResponseType.bytes); print(response.headers.value('Set-Cookie').toString()); //如果分割后的字符串长度为32则为jessonid for (var item in response.headers .value('Set-Cookie') .toString() .replaceAll('{', '') .replaceAll('}', '') .replaceAll("'", '') .replaceAll(' ', '') .split(',')) { if (item.length < 50 && item.length > 10) { jwc_jsessionid = item; } if (item.length > 100) { jwc_webvpn_key = item; } if (item.length > 50 && item.length < 100) { jwc_webvpn_username = item; } if (item.length == 4) { jwc_verifycode = item; jwc_verifycodeController.text = item; } if (item.length == 5) { setState(() {}); } }

try {
  await AchievementView(context,
      title: '你可以无需验证码登录啦，验证码是',
      subTitle: Global.jwc_verifycode,
      icon: Icon(
        Icons.error,
        color: Colors.white,
      ),
      color: Colors.green,
      duration: Duration(seconds: 3),
      isCircle: true,
      listener: (status) {})
    ..show();
} catch (e) {
  print(e);
}
return Image.memory(response.data);

} else { return Image.asset('assets/jwc_login.jpg'); } }

//抽取无感知登录的方法 Future No_perception_login() async { Response response = await ApiService.getRequest('https://nepuback-nepu-restart-xbbhhovrls.cn-beijing.fcapp.run/jwc_login', type: ResponseType.bytes); //如果分割后的字符串长度为32则为jessonid for (var item in response.headers .value('Set-Cookie') .toString() .replaceAll('{', '') .replaceAll('}', '') .replaceAll("'", '') .replaceAll(' ', '') .split(',')) { if (item.length < 50 && item.length > 10) { jwc_jsessionid = item; } if (item.length > 100) { jwc_webvpn_key = item; } if (item.length > 50 && item.length < 100) { jwc_webvpn_username = item; } if (item.length == 4) { jwc_verifycode = item; } if (item.length == 5) { No_perception_login(); } } Response response1 = await ApiService.getRequest('https://nepu-node-login-nepu-restart-togqejjknk.cn-beijing.fcapp.run/course', queryParameters: { 'account': Global.jwc_xuehao, 'password': Global.jwc_password, 'verifycode': Global.jwc_verifycode, 'JSESSIONID': Global.jwc_jsessionid, '_webvpn_key': Global.jwc_webvpn_key, 'webvpn_username': Global.jwc_webvpn_username }); if (response1.data['message'].toString() == '登录成功') { print('无感登陆成功了'); print(await Global().getLoginInfo()); } }