Dart 处理json，built_value库

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import 'dart:convert';

main() async {
  // json 转化为 map
  String jsonStr = '''
    [
      {"name": "ajanuw"},
      {"name": "suou"}
    ]
  ''';

  var jsonObj = jsonDecode(jsonStr);
  print(jsonObj[0]['name'] == 'ajanuw'); // true

  // list

使用对象添加模板 JSON to Dart

import 'dart:convert';

class MyInfo {
  MyInfo({this.age, this.name});

  String name;
  int age;

  factory MyInfo.fromJson(Map jsonMap) {
    return MyInfo(
      name: jsonMap['name'],
      age: jsonMap['age'],
    );
  }
}

main(List args) {
  String jsonStr = '''
    {
      "name": "ajanuw",
      "age": 12
    }
  ''';
  var parsed = jsonDecode(jsonStr);
  MyInfo data = MyInfo.fromJson(parsed);
  print(data.age);
}

使用“built_value”库来处理json

• pub库
• video教程
• 转换器

我在这里使用"stagehand console-full"创建的项目示例，项目名叫"dart_test"

1） 安装依赖

dependencies:
  ...
  built_value:
  built_collection:

dev_dependencies:
  ...
  build_runner:
  built_value_generator:

3) 准备json数据

{
      "id": 157538,
      "date": "2017-07-21T10:30:34",
      "date_gmt": "2017-07-21T17:30:34",
      "type": "post",
      "link": "https://example.com",
      "title": {
          "rendered": "Json 2 dart built_value converter"
      },
      "tags": [
          1798,
          6298
      ]
}

3) 创建文件"lib/models/hello.dart"，文件名很重要必须要要和你的class名一样

import 'dart:convert';

import 'package:built_collection/built_collection.dart';
import 'package:built_value/built_value.dart';
import 'package:built_value/serializer.dart';

part 'hello.g.dart';

abstract class Hello implements Built {
  Hello._();

  factory Hello([updates(HelloBuilder b)]) = _$Hello;

  @BuiltValueField(wireName: 'id')
  int get id;
  @BuiltValueField(wireName: 'date')
  String get date;
  @BuiltValueField(wireName: 'date_gmt')
  String get dateGmt;
  @BuiltValueField(wireName: 'type')
  String get type;
  @BuiltValueField(wireName: 'link')
  String get link;
  @BuiltValueField(wireName: 'title')
  Title get title;
  @BuiltValueField(wireName: 'tags')
  BuiltList get tags;

  String toJson() {
    return jsonEncode(serializers.serializeWith(Hello.serializer, this));
  }

  static Hello fromJson(String jsonString) {
    return serializers.deserializeWith(
        Hello.serializer, jsonDecode(jsonString));
  }

  static Serializer get serializer => _$helloSerializer;
}

abstract class Title implements Built {
  Title._();

  factory Title([updates(TitleBuilder b)]) = _$Title;

  @BuiltValueField(wireName: 'rendered')
  String get rendered;

  String toJson() {
    return jsonEncode(serializers.serializeWith(Title.serializer, this));
  }

  static Title fromJson(String jsonString) {
    return serializers.deserializeWith(
        Title.serializer, jsonDecode(jsonString));
  }

  static Serializer