dio.request<T>()

@JsonSerializable()
class Site extends Object {
  String name;
  String version;
  String logo;
  int goods;
  int category;
  int brand;
  String currency;

  Site(this.name, this.version, this.logo, this.goods, this.category,
      this.brand, this.currency);

  factory Site.fromJson(Map<String, dynamic> json) => _$SiteFromJson(json);

  Map<String, dynamic> toJson() => _$SiteToJson(this);
}

{
"name": "zodream",
"version": "0.1",
"logo": "https://zodream.cn/assets/upload/image/wap_logo.png",
"category": 6,
"brand": 1,
"goods": 133,
"currency": "￥"
}

var response = dio.request<Map<String, dynamic>>();

return Site.fromJson(response.data);