flutter json框架

详情https://github.com/dart-lang/json_serializable/tree/master/example

具体如链接： https://github.com/dart-lang/json_serializable/tree/master/example   

1在 pubspec.yaml文件中添加如下.然后更新一下

dependencies:
  json_annotation: ^0.2.4

dev_dependencies:
  build_runner: ^0.8.0
  json_serializable: ^0.5.2

2书写代码,假如我的dart文件交bean.dart。大概如下, _$NoDataFromJson,_$NoDataSerializerMixin 替换为你自己类名开头即可，注意添加@JsonSerializable()，然后drat文件顶部添加

part 'bean.g.dart';//与当前文件相比，多一个.g即可

@JsonSerializable()
class NoData extends Object with _$NoDataSerializerMixin{
  final int code;
  final String message;
  NoData({this.code, this.message});
  factory NoData.fromJson(Map<String, dynamic> json) => _$NoDataFromJson(json);
}

3 运行 flutter packages pub run build_runner build 后就会生成一个 bean.g.dart 然后就可以使用了