使用built_value和StandardJsonPlugin序列化多态对象列表的步骤如下:
dependencies:
built_value: ^7.1.0
built_collection: ^4.3.0
import 'package:built_collection/built_collection.dart';
import 'package:built_value/built_value.dart';
part 'animal_list.g.dart';
abstract class AnimalList implements Built<AnimalList, AnimalListBuilder> {
BuiltList<Animal> get animals;
AnimalList._();
factory AnimalList([void Function(AnimalListBuilder) updates]) = _$AnimalList;
}
import 'package:built_value/built_value.dart';
part 'animal.g.dart';
abstract class Animal implements Built<Animal, AnimalBuilder> {
String get name;
Animal._();
factory Animal([void Function(AnimalBuilder) updates]) = _$Animal;
}
flutter packages pub run build_runner build
import 'package:built_value/serializer.dart';
import 'package:built_value/standard_json_plugin.dart';
void main() {
// 注册StandardJsonPlugin插件
final standardSerializers = (serializers.toBuilder()
..addPlugin(StandardJsonPlugin())).build();
// 序列化AnimalList对象
final animalList = AnimalList((b) => b
..animals = ListBuilder<Animal>([
Cat((b) => b..name = 'Tom'),
Dog((b) => b..name = 'Max'),
]));
final json = standardSerializers.serialize(animalList);
final jsonString = jsonEncode(json);
print(jsonString);
// 反序列化AnimalList对象
final parsedJson = jsonDecode(jsonString);
final deserializedAnimalList = standardSerializers.deserialize(parsedJson);
print(deserializedAnimalList);
}
这样,你就可以使用built_value和StandardJsonPlugin来序列化和反序列化多态对象列表了。
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