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1、FlutterJsonBeanFactory
在Setting->Tools->FlutterJsonBeanFactory里边自定义实体类的后缀，默认是entity
复制json到粘贴板，右键自己要存放实体的目录，可以看到JsonToDartBeanAction
Class Name是实体名字，会默认加上entityJSON TextJson文本null-able勾选后所有属性都是可空的?,不勾选都会加上late，延迟初始化
执行Make后生成代码目录如下：models项目自建，存放实体generated/json是插件生成目录，xx_entity.g.daet是实体类生成的辅助类方法， base是存放基础公共代码
后台返回的数据一般是经过一层包装
{"code": 200,"message": "success","data":{"id": "1","name": "qi1","age": 18}
}
而重新用插件生成会生成如下代码：
@JsonSerializable()
class ApiResponseEntity {int? code;String? message;ApiResponseData? data;ApiResponseEntity();factory ApiResponseEntity.fromJson(Map<String, dynamic> json) => $ApiResponseEntityFromJson(json);Map<String, dynamic> toJson() => $ApiResponseEntityToJson(this);@overrideString toString() {return jsonEncode(this);}
}@JsonSerializable()
class ApiResponseData {String? id;String? name;int? age;ApiResponseData();factory ApiResponseData.fromJson(Map<String, dynamic> json) => $ApiResponseDataFromJson(json);Map<String, dynamic> toJson() => $ApiResponseDataToJson(this);@overrideString toString() {return jsonEncode(this);}
}
要是这样，每一个接口的都有一个ResponseEntity，使用起来不便于统一封装。
所以我们可以把ApiResponseData换成 dynamic，文件底部的ApiResponseData信息也全部删除，再执行Alt+J，这样就会自动清理掉整理json_convert_content.dart和api_response_entity.g.dart中的ApiResponseData痕迹。再把dynamic替换成T,并且去除顶部的@JsonSerializable()，避免下次执行Alt+J，替换掉自己的自定义。
@JsonSerializable()
class ApiResponseEntity<T> {late int code;late String message;late T data;ApiResponseEntity();factory ApiResponseEntity.fromJson(Map<String, dynamic> json) =>$ApiResponseEntityFromJson<T>(json);Map<String, dynamic> toJson() => $ApiResponseEntityToJson(this);@overrideString toString() {return jsonEncode(this);}
}
ApiResponseEntity<T> $ApiResponseEntityFromJson<T>(Map<String, dynamic> json) {final ApiResponseEntity<T> apiResponseEntity = ApiResponseEntity<T>();final int? code = jsonConvert.convert<int>(json['code']);if (code != null) {apiResponseEntity.code = code;}final String? message = jsonConvert.convert<String>(json['message']);if (message != null) {apiResponseEntity.message = message;}final T data = jsonConvert.convert<dynamic>(json['data']);if (data != null) {apiResponseEntity.data = data;}return apiResponseEntity;
}Map<String, dynamic> $ApiResponseEntityToJson(ApiResponseEntity entity) {final Map<String, dynamic> data = <String, dynamic>{};data['code'] = entity.code;data['message'] = entity.message;data['data'] = entity.data;return data;
}
并且把api_response_entity.g.dart移除generated目录，因为那个目录会自动删除无用的文件。可以和api_reponse_entity.dart单独存放在一个文件夹当中。
优化后使用
第一次发现，reponse的data是null。因为新的插件在 asT方法没有去调用fromJsonAsT，这个需要我们自加上，否则会失败。
if (_convertFuncMap.containsKey(type)) {return _convertFuncMap[type]!(value) as T;
} else {return fromJsonAsT<T>(value);// throw UnimplementedError('$type unimplemented');
}
//单实体String responseData1 = """{"code": 200,"message": "success","data":{"id": 1,"name": "qi1","age": 21}}""";//ListString responseData2 = """{"code": 200,"message": "success","data":[{"id": 1,"name": "qi1","age": 21},{"id": 2,"name": "qi2","age": 22}]}""";//基础数据类型String responseData3 = """{"code": 200,"message": "success","data": 18}""";_apiResponseDecode() {setState(() {response1 = ApiResponseEntity.fromJson(jsonDecode(responseData1));response2 = ApiResponseEntity.fromJson(jsonDecode(responseData2));response3 = ApiResponseEntity.fromJson(jsonDecode(responseData3));});}_getApiResponseContent() {return response1.toString() +"\n" +response2.toString() +"\n" +response3.toString();}
参考链接：https://juejin.cn/post/7043721908801503269