在Flutter中解析复杂的json数据

dependencies:
  json_annotation: ^4.0.1

dev_dependencies:
  build_runner: ^2.1.5
  json_serializable: ^4.1.3

import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

@JsonSerializable()
class User {
  final String name;
  final int age;
  final List<String> hobbies;
  final Address address;

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

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
  Map<String, dynamic> toJson() => _$UserToJson(this);
}

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

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

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

flutter pub run build_runner build

import 'dart:convert';

void main() {
  String jsonData = '{"name": "John", "age": 25, "hobbies": ["reading", "coding"], "address": {"street": "123 Main St", "city": "New York"}}';
  
  Map<String, dynamic> jsonMap = json.decode(jsonData);
  User user = User.fromJson(jsonMap);
  
  print(user.name); // 输出：John
  print(user.age); // 输出：25
  print(user.hobbies); // 输出：[reading, coding]
  print(user.address.street); // 输出：123 Main St
  print(user.address.city); // 输出：New York
}