我收到以下类型的API响应
[
{"name":"lakshay","id":"1217","type":"Staff","temperature":56.6,"date":"12-06-2020"},
{"name":"lakshay","id":"1217","type":"Staff","temperature":56.6,"date":"12-06-2020"},
.....
]
我需要将整个内容解析为对象列表,以便可以执行类似的操作
// conceptual //
array.map((obj)=>{
// computation //
})
我从here那里获得了帮助,但没有说明如何解析外部数组。
感谢您的时间。
答案 0 :(得分:2)
您可以使用下面的链接在线生成期望的响应类,并在您的项目中创建和保存类: https://javiercbk.github.io/json_to_dart/
有关更多详细信息,请参见此图像:
class ApiRepositary {
Dio dio;
ApiRepositary() {
if (dio == null) {
BaseOptions options = new BaseOptions(
baseUrl: "your base url",
receiveDataWhenStatusError: true,
connectTimeout: 60*1000, // 60 seconds
receiveTimeout: 60*1000 // 60 seconds
);
dio = new Dio(options);
}
}
Future<List<UserResponse>> getUserDetails() async {
try {
Response res = await dio.get("/lookup/pollquestion/add your url here");
if (res.data.toString().isEmpty) {
throw Exception();
} else {
final List rawData = jsonDecode(jsonEncode(res.data));
List<UserResponse> response =
rawData.map((f) => UserResponse.fromJson(f)).toList();
return response;
}
} on DioError catch (dioError) {
throw Exception(dioError);
}
}
}
要致电您班上的服务:
ApiRepositary().getUserDetails().then((response){
debugPrint("Login Success $response");
//manage your response here, here you will get arralist as a response
},
onError: (exception){
//Handle exception message
if(exception.message != null ){
debugPrint(exception.message);
}
},
);
答案 1 :(得分:1)
请使用此响应类
class YourResponse {
String name;
String id;
String type;
double temperature;
String date;
YourResponse({this.name, this.id, this.type, this.temperature, this.date});
YourResponse.fromJson(Map<String, dynamic> json) {
name = json['name'];
id = json['id'];
type = json['type'];
temperature = json['temperature'];
date = json['date'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['name'] = this.name;
data['id'] = this.id;
data['type'] = this.type;
data['temperature'] = this.temperature;
data['date'] = this.date;
return data;
}
}
答案 2 :(得分:1)
您可以在下面复制粘贴运行完整代码
步骤1:使用List<Payload> payloadList = payloadFromJson(jsonString);
进行解析,您可以看到完整的代码以获取详细信息Payload
类定义
第2步:进行这样的循环
payloadList.forEach((element) {
print(element.name);
print(element.id);
});
输出
I/flutter (17660): lakshay
I/flutter (17660): 1217
I/flutter (17660): lakshay
I/flutter (17660): 1217
完整代码
import 'package:flutter/material.dart';
import 'dart:convert';
List<Payload> payloadFromJson(String str) =>
List<Payload>.from(json.decode(str).map((x) => Payload.fromJson(x)));
String payloadToJson(List<Payload> data) =>
json.encode(List<dynamic>.from(data.map((x) => x.toJson())));
class Payload {
Payload({
this.name,
this.id,
this.type,
this.temperature,
this.date,
});
String name;
String id;
String type;
double temperature;
String date;
factory Payload.fromJson(Map<String, dynamic> json) => Payload(
name: json["name"],
id: json["id"],
type: json["type"],
temperature: json["temperature"].toDouble(),
date: json["date"],
);
Map<String, dynamic> toJson() => {
"name": name,
"id": id,
"type": type,
"temperature": temperature,
"date": date,
};
}
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
String jsonString = '''
[
{"name":"lakshay","id":"1217","type":"Staff","temperature":56.6,"date":"12-06-2020"},
{"name":"lakshay","id":"1217","type":"Staff","temperature":56.6,"date":"12-06-2020"}
]
''';
void _incrementCounter() {
List<Payload> payloadList = payloadFromJson(jsonString);
payloadList.forEach((element) {
print(element.name);
print(element.id);
});
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
答案 3 :(得分:0)
假设
String jsonResponse = '''[
{"name":"lakshay","id":"1217","type":"Staff","temperature":56.6,"date":"12-06-2020"},
{"name":"lakshay","id":"1217","type":"Staff","temperature":56.6,"date":"12-06-2020"}
]''';
您可以执行以下操作: 步骤1)导入“ dart:convert”包。 第2步)添加以下行:
List<dynamic> responses = jsonDecode(jsonResponse);
responses.forEach((obj){
print(obj['name']);
});
请记住上面的代码是一种快速而肮脏的方法,可以使事情正常进行。您可能会失去静态类型检查的许多好处。它始终建议使用chunhunghan建议的类。