您可以使用var payload = payloadFromJson(jsonString);
您可以在完整代码中看到长示例 json 字符串
相关类
// To parse this JSON data, do
//
// final payload = payloadFromJson(jsonString);
import 'dart:convert';
Payload payloadFromJson(String str) => Payload.fromJson(json.decode(str));
String payloadToJson(Payload data) => json.encode(data.toJson());
class Parent {
int id;
String name;
Payload parent;
DiagnosisClassifications diagnosisClassifications;
Parent({
this.id,
this.name,
this.parent,
this.diagnosisClassifications,
});
factory Parent.fromJson(Map<String, dynamic> json) => Parent(
id: json["id"] == null ? null : json["id"],
name: json["name"] == null ? null : json["name"],
parent: json["parent"] == null ? null : Payload.fromJson(json["parent"]),
diagnosisClassifications: json["diagnosis_classifications"] == null ? null : DiagnosisClassifications.fromJson(json["diagnosis_classifications"]),
);
Map<String, dynamic> toJson() => {
"id": id == null ? null : id,
"name": name == null ? null : name,
"parent": parent == null ? null : parent.toJson(),
"diagnosis_classifications": diagnosisClassifications == null ? null : diagnosisClassifications.toJson(),
};
}
class Payload {
int id;
String name;
Parent parent;
DiagnosisClassifications diagnosisClassifications;
Payload({
this.id,
this.name,
this.parent,
this.diagnosisClassifications,
});
factory Payload.fromJson(Map<String, dynamic> json) => Payload(
id: json["id"] == null ? null : json["id"],
name: json["name"] == null ? null : json["name"],
parent: json["parent"] == null ? null : Parent.fromJson(json["parent"]),
diagnosisClassifications: json["diagnosis_classifications"] == null ? null : DiagnosisClassifications.fromJson(json["diagnosis_classifications"]),
);
Map<String, dynamic> toJson() => {
"id": id == null ? null : id,
"name": name == null ? null : name,
"parent": parent == null ? null : parent.toJson(),
"diagnosis_classifications": diagnosisClassifications == null ? null : diagnosisClassifications.toJson(),
};
}
class DiagnosisClassifications {
int count;
List<Item> items;
DiagnosisClassifications({
this.count,
this.items,
});
factory DiagnosisClassifications.fromJson(Map<String, dynamic> json) => DiagnosisClassifications(
count: json["count"] == null ? null : json["count"],
items: json["items"] == null ? null : List<Item>.from(json["items"].map((x) => Item.fromJson(x))),
);
Map<String, dynamic> toJson() => {
"count": count == null ? null : count,
"items": items == null ? null : List<dynamic>.from(items.map((x) => x.toJson())),
};
}
class Item {
int id;
String name;
String code;
Item({
this.id,
this.name,
this.code,
});
factory Item.fromJson(Map<String, dynamic> json) => Item(
id: json["id"] == null ? null : json["id"],
name: json["name"] == null ? null : json["name"],
code: json["code"] == null ? null : json["code"],
);
Map<String, dynamic> toJson() => {
"id": id == null ? null : id,
"name": name == null ? null : name,
"code": code == null ? null : code,
};
}
完整代码
import 'package:flutter/material.dart';
// To parse this JSON data, do
//
// final payload = payloadFromJson(jsonString);
import 'dart:convert';
Payload payloadFromJson(String str) => Payload.fromJson(json.decode(str));
String payloadToJson(Payload data) => json.encode(data.toJson());
class Parent {
int id;
String name;
Payload parent;
DiagnosisClassifications diagnosisClassifications;
Parent({
this.id,
this.name,
this.parent,
this.diagnosisClassifications,
});
factory Parent.fromJson(Map<String, dynamic> json) => Parent(
id: json["id"] == null ? null : json["id"],
name: json["name"] == null ? null : json["name"],
parent: json["parent"] == null ? null : Payload.fromJson(json["parent"]),
diagnosisClassifications: json["diagnosis_classifications"] == null ? null : DiagnosisClassifications.fromJson(json["diagnosis_classifications"]),
);
Map<String, dynamic> toJson() => {
"id": id == null ? null : id,
"name": name == null ? null : name,
"parent": parent == null ? null : parent.toJson(),
"diagnosis_classifications": diagnosisClassifications == null ? null : diagnosisClassifications.toJson(),
};
}
class Payload {
int id;
String name;
Parent parent;
DiagnosisClassifications diagnosisClassifications;
Payload({
this.id,
this.name,
this.parent,
this.diagnosisClassifications,
});
factory Payload.fromJson(Map<String, dynamic> json) => Payload(
id: json["id"] == null ? null : json["id"],
name: json["name"] == null ? null : json["name"],
parent: json["parent"] == null ? null : Parent.fromJson(json["parent"]),
diagnosisClassifications: json["diagnosis_classifications"] == null ? null : DiagnosisClassifications.fromJson(json["diagnosis_classifications"]),
);
Map<String, dynamic> toJson() => {
"id": id == null ? null : id,
"name": name == null ? null : name,
"parent": parent == null ? null : parent.toJson(),
"diagnosis_classifications": diagnosisClassifications == null ? null : diagnosisClassifications.toJson(),
};
}
class DiagnosisClassifications {
int count;
List<Item> items;
DiagnosisClassifications({
this.count,
this.items,
});
factory DiagnosisClassifications.fromJson(Map<String, dynamic> json) => DiagnosisClassifications(
count: json["count"] == null ? null : json["count"],
items: json["items"] == null ? null : List<Item>.from(json["items"].map((x) => Item.fromJson(x))),
);
Map<String, dynamic> toJson() => {
"count": count == null ? null : count,
"items": items == null ? null : List<dynamic>.from(items.map((x) => x.toJson())),
};
}
class Item {
int id;
String name;
String code;
Item({
this.id,
this.name,
this.code,
});
factory Item.fromJson(Map<String, dynamic> json) => Item(
id: json["id"] == null ? null : json["id"],
name: json["name"] == null ? null : json["name"],
code: json["code"] == null ? null : json["code"],
);
Map<String, dynamic> toJson() => {
"id": id == null ? null : id,
"name": name == null ? null : name,
"code": code == null ? null : code,
};
}
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
String jsonStr = ''' {
"id": 59,
"name": "Trastornos de la glándula tiroides",
"parent": {
"id": 58,
"name": "Enfermedades endócrinas",
"parent" : {
"id": 60,
"name": "Enfermedades endócrinas",
"parent" : null,
"diagnosis_classifications": {
"count": 1,
"items": [
{
"id": 60,
"name": "CIE-10 Diagnósticos",
"code": "E00-E35"
}
]
}
},
"diagnosis_classifications": {
"count": 1,
"items": [
{
"id": 58,
"name": "CIE-10 Diagnósticos",
"code": "E00-E35"
}
]
}
}
} ''';
void _incrementCounter() {
final payload = payloadFromJson(jsonStr);
print('payload.id ${payload.id}');
print('payload.parent.id ${payload.parent.id}');
print('payload.parent.parent.id ${payload.parent.parent.id}');
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
输出
I/flutter ( 8924): payload.id 59
I/flutter ( 8924): payload.parent.id 58
I/flutter ( 8924): payload.parent.parent.id 60