一.基本原理篇

1.model类

class User {
  final String name;
  final String email;

  User(this.name, this.email);

  User.fromJson(Map<String, dynamic> json)
      : name = json['name'],
        email = json['email'];

  Map<String, dynamic> toJson() =>
    <String, dynamic>{
      'name': name,
      'email': email,
    };
}

2.json字符串变成model (两步)

Map userMap = json.decode(jsonStr);
var user = new User.fromJson(userMap);

print('Howdy, ${user.name}!');
print('We sent the verification link to ${user.email}.');

3.将user对象 转换成jsonStr [我们不需要手动调用toJson这个方法，因为`JSON.encode内部会自动调用]

String json = json.encode(user);

二.工具篇
json_serializable

import 'package:json_annotation/json_annotation.dart';
part 'base_result.g.dart';

@JsonSerializable()
class BaseResult {
  int status;
  @JsonKey(nullable: false)
  bool success;
  @JsonKey(name: "nicehash-CNHeavy")
  final String nicehash_CNHeavy;
  String error = "";
  String message = "";
  dynamic object;

  BaseResult({this.status, this.success, this.error, this.message, this.object});

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

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

之后运行

flutter packages pub run build_runner build

image.png

三. 在json_serializable基础上 做成Json_model插件https://github.com/flutterchina/json_model

1.注意最新版本3.0.0不支持

如下配置就可以了

dependencies:
  # Your other regular dependencies here
  json_annotation: ^2.0.0

dev_dependencies:
  # Your other dev_dependencies here
  json_model: ^0.0.2
  build_runner: ^1.0.0
  json_serializable: ^2.0.0

用法 切换到根目录，运行如下语句就可以[首次使用，先创建jsons目录和models目录]

flutter packages pub run json_model 

用法

image.png

之后运行

flutter packages pub run json_model 【Run flutter packages pub run json_model (in Flutter) or pub run json_model (in Dart VM)】

就会自动生成如下3个文件

image.png

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