如何解析flutter dart上的复杂json

dependencies:
  flutter:
    sdk: flutter
  # 添加以下依赖
  dart:convert: ^2.0.0

{
  "name": "John Doe",
  "age": 30,
  "email": "johndoe@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY"
  },
  "phoneNumbers": [
    {
      "type": "home",
      "number": "555-1234"
    },
    {
      "type": "work",
      "number": "555-5678"
    }
  ]
}

class Person {
  String name;
  int age;
  String email;
  Address address;
  List<PhoneNumber> phoneNumbers;

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

  factory Person.fromJson(Map<String, dynamic> json) {
    return Person(
      name: json['name'],
      age: json['age'],
      email: json['email'],
      address: Address.fromJson(json['address']),
      phoneNumbers: (json['phoneNumbers'] as List)
          .map((phoneNumber) => PhoneNumber.fromJson(phoneNumber))
          .toList(),
    );
  }
}

class Address {
  String street;
  String city;
  String state;

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

  factory Address.fromJson(Map<String, dynamic> json) {
    return Address(
      street: json['street'],
      city: json['city'],
      state: json['state'],
    );
  }
}

class PhoneNumber {
  String type;
  String number;

  PhoneNumber({this.type, this.number});

  factory PhoneNumber.fromJson(Map<String, dynamic> json) {
    return PhoneNumber(
      type: json['type'],
      number: json['number'],
    );
  }
}

Map<String, dynamic> json = json.decode(jsonString);
Person person = Person.fromJson(json);