【Flutter】JSON 模型转换 ( JSON 序列化工具 | JSON 手动序列化 | 根据 JSON 编写 Dart 模型类 | 在线自动根据 JSON 转换 Dart 类 )（一）

/// json 序列化 , 反序列化 包
import 'dart:convert';

{
  "icon": "icon.png",
  "title": "标题",
  "url": "https://www.baidu.com/",
  "statusBarColor": "FFFFFF",
  "hideAppBar": true
}

import 'dart:convert';
void main() {
  String jsonString = '{ "icon": "icon.png", "title": "标题", "url": "https://www.baidu.com/", "statusBarColor": "FFFFFF", "hideAppBar": true }';
  /// 处理中文乱码
  Utf8Codec utf8codec = Utf8Codec();
  Utf8Decoder utf8decoder = Utf8Decoder();
  Utf8Encoder utf8encoder = Utf8Encoder();
  /// 将二进制 Byte 数据以 UTF-8 格式编码 , 获取编码后的字符串
  String responseString = utf8decoder.convert(utf8codec.encode(jsonString));
  // 将 json 字符串信息转为 Map<String, dynamic> 类型的键值对信息
  Map<String, dynamic> jsonMap = json.decode(responseString);
  // 使用工厂方法构造 Dart 对象
  CommonModel commonModel = CommonModel.fromJson(jsonMap);
  print('icon : ${commonModel.icon}\ntittle : ${commonModel.title}\nurl : ${commonModel.url}');
}
// Dart 模型类
class CommonModel {
  final String? icon;
  final String? title;
  final String? url;
  final String? statusBarColor;
  final bool? hideAppBar;
  CommonModel({this.icon, this.title, this.url, this.statusBarColor, this.hideAppBar});
  factory CommonModel.fromJson(Map<String, dynamic> json) {
    return CommonModel(
      icon: json['icon'],
      title: json['title'],
      url: json['url'],
      statusBarColor: json['statusBarColor'],
      hideAppBar: json['hideAppBar'],
    );
  }
}

icon : icon.png
tittle : 标题
url : https://www.baidu.com/

{
  "school": "第一小学",
  "students": [
    {
      "name": "小王",
      "age": "12"
    },
    {
      "name": "小白",
      "age": "13"
    }
  ]
}

class School {
  /// json 字符串中 school 字段
  String? school;
  /// json 字符串中的 students 数组
  List<Student>? students;
  School({this.school, this.students});
  /// 构造方法有两种写法
  /// 参数不是 final 类型的 , 就使用这种方式编写
  /// 方法前不需要添加 factory
  /// 如果成员是 final 类型的 , 那么方法前需要加入 factory
  School.fromJson(Map<String, dynamic> json) {
    school = json['school'];
    /// 先将 json 数组转为 List
    /// 然后调用 map 方法 , 为具体的每个元素赋值
    (json['students'] as List).map((i) => Student.fromJson(i));
  }
}
class Student {
  String? name;
  String? age;
  Student({this.name, this.age});
  Student.fromJson(Map<String, dynamic> json) {
    name = json['name'];
    age = json['age'];
  }
}

class School {
  /// json 字符串中 school 字段
  final String? school;
  /// json 字符串中的 students 数组
  final List<Student>? students;
  School({this.school, this.students});
  /// 构造方法有两种写法
  /// 参数不是 final 类型的 , 就使用这种方式编写
  /// 方法前不需要添加 factory
  /// 如果成员是 final 类型的 , 那么方法前需要加入 factory
  factory School.fromJson(Map<String, dynamic> json) {
    String school = json['school'];
    /// 先将 json 数组转为 List
    /// 然后调用 map 方法 获取每个值
    List<Student> students = (json['students'] as List).map((i) => Student.fromJson(i)).toList();
    return School(school: school, students: students);
  }
}
class Student {
  final String? name;
  final String? age;
  Student({this.name, this.age});
  factory Student.fromJson(Map<String, dynamic> json) {
    String name = json['name'];
    String age = json['age'];
    return Student(name: name, age: age);
  }
}