如何从flutter中的嵌套json对象映射数据

dependencies:
  json_annotation: ^4.0.0
  build_runner: ^2.0.0
  # 其他依赖...
dev_dependencies:
  json_serializable: ^4.1.0

{
  "name": "John Doe",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY"
  }
}

import 'package:json_annotation/json_annotation.dart';

part 'person.g.dart';

@JsonSerializable()
class Person {
  final String name;
  final int age;
  final Address address;

  Person({required this.name, required this.age, required this.address});

  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
  Map<String, dynamic> toJson() => _$PersonToJson(this);
}

@JsonSerializable()
class Address {
  final String street;
  final String city;
  final String state;

  Address({required this.street, required this.city, required this.state});

  factory Address.fromJson(Map<String, dynamic> json) => _$AddressFromJson(json);
  Map<String, dynamic> toJson() => _$AddressToJson(this);
}

flutter pub run build_runner build

import 'dart:convert';

// ...

String jsonData = '{"name": "John Doe", "age": 30, "address": {"street": "123 Main St", "city": "New York", "state": "NY"}}';
Map<String, dynamic> jsonMap = json.decode(jsonData);
Person person = Person.fromJson(jsonMap);

// 访问解析后的数据
print(person.name); // 输出：John Doe
print(person.address.street); // 输出：123 Main St