Arrays 在flatter/dart中解析JSON
您好，我正在尝试解析这种类型的json：Arrays 在flatter/dart中解析JSON,arrays,json,parsing,flutter,dart,Arrays,Json,Parsing,Flutter,Dart,您好，我正在尝试解析这种类型的json： { "records": [ { "id": "recHSxuQBgXAkT9HR", "fields": { "Entry ID": "00663", "Date ID": "12-12", "(Gregorian) Year": " ?", "(Cop
{
"records": [
{
"id": "recHSxuQBgXAkT9HR",
"fields": {
"Entry ID": "00663",
"Date ID": "12-12",
"(Gregorian) Year": " ?",
"(Coptic) Month": "12-Mesori",
"(Coptic) Day": "14",
"Event Category": [
"Commemoration"
],
"Event Heading": "Heading01",
"Name 01 - Title": "Mr.",
"Name 01 - Name in English": "Jhon",
"Name 01 - Suffix": "23rd Pa",
"DayText": "On this day,..",
"Name 01 - Gender": "Male",
"Name 01 - Classification": [
"08 - Patriarch of Alexandria"
],
"Number of Saints Mentioned": 1,
"Regnal Number": "I",
"Apostolic Throne": "385-412",
"Entry Title": "Commemoration of "
},
"createdTime": "2020-04-27T05:30:53.000Z"
},
{
"id": "rec3gTgUKo5Co9Qi3",
"fields": {
"Entry ID": "00450",
"Date ID": "08-Paremoude - D30 - 0450",
"Century": "1st Century",
"(Gregorian) Year": "68",
"(Coptic) Month": "08-Paremoud",
"(Coptic) Day": "30",
"Event Category": [
"Martyrdom"
],
"Event Heading": "Martyrdom of ",
"Name 01 - Title": "Saint",
"Name 01 - Name in English": "Mark",
"Name 01 - Pronoun": "the",
"Name 01 - Suffix": "Evangelis",
"DayText": "On this day 2",
"Name 01 - Gender": "Male",
"Name 01 - Classification": [
"06 - Apostles Order",
"07 - Martyrs Order",
"08 - Patriarch of Alexandri"
],
"Number of Saints Mentioned": 1,
"Entry Title": "Martyrdo of the Evangelist () "
},
"createdTime": "2020-04-27T05:30:53.000Z"
},
Future<Record> _getRecords() async {
var response = await http.get(Uri.encodeFull("url"),
headers: {
"Authorization": "**********",
"Accept": "application/json"
});
Record record;
if(response == 200) {
var jsonData = json.decode(response.body);
record = Record.fromJson(jsonData);
}else{
print(response.statusCode);
}
return record;
}
Future\u getRecords（）异步{
var response=wait http.get（Uri.encodeFull（“url”），
标题：{
“授权”：“**********”，
“接受”：“应用程序/json”
});
记录；
如果（响应==200）{
var jsonData=json.decode（response.body）；
record=record.fromJson（jsonData）；
}否则{
打印（响应状态码）；
}
返回记录；
}
Tnx服务器端应该有更多信息或导致422错误的请求。你可能想检查一下 为了回答您的问题，由于数据是
记录的列表\u getRecordsFuture\u getRecords（）异步{
var response=wait http.get(
Uri.encodeFull（“url”），
标题：{
“授权”：“**********”，
“接受”：“应用程序/json”，
},
);
列出记录；
如果（response.statusCode==200）{
var jsonData=json.decode（response.body）？？[]；
records=jsonData.map（Record.fromJson.toList（）；
}否则{
打印（响应状态码）；
}
退货记录；
}
您可以查看完整代码中的
记录类定义，并使用FutureBuilder
代码片段
Record recordFromJson(String str) => Record.fromJson(json.decode(str));
...
if (response.statusCode == 200) {
return recordFromJson(jsonString);
...
@override
void initState() {
_future = _getRecords();
...
FutureBuilder(
future: _future,
builder: (context, AsyncSnapshot<Record> snapshot) {
switch (snapshot.connectionState) {
Record-recordFromJson（String-str）=>Record.fromJson（json.decode（str））；
...
如果（response.statusCode==200）{
返回recordFromJson（jsonString）；
...
@凌驾
void initState（）{
_future=_getRecords（）；
...
未来建设者(
未来：未来，
生成器：（上下文，异步快照）{
交换机（快照.连接状态）{
工作演示
完整代码
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
Record recordFromJson(String str) => Record.fromJson(json.decode(str));
String recordToJson(Record data) => json.encode(data.toJson());
class Record {
List<RecordElement> records;
Record({
this.records,
});
factory Record.fromJson(Map<String, dynamic> json) => Record(
records: List<RecordElement>.from(
json["records"].map((x) => RecordElement.fromJson(x))),
);
Map<String, dynamic> toJson() => {
"records": List<dynamic>.from(records.map((x) => x.toJson())),
};
}
class RecordElement {
String id;
Fields fields;
DateTime createdTime;
RecordElement({
this.id,
this.fields,
this.createdTime,
});
factory RecordElement.fromJson(Map<String, dynamic> json) => RecordElement(
id: json["id"],
fields: Fields.fromJson(json["fields"]),
createdTime: DateTime.parse(json["createdTime"]),
);
Map<String, dynamic> toJson() => {
"id": id,
"fields": fields.toJson(),
"createdTime": createdTime.toIso8601String(),
};
}
class Fields {
String entryId;
String dateId;
String gregorianYear;
String copticMonth;
String copticDay;
List<String> eventCategory;
String eventHeading;
String name01Title;
String name01NameInEnglish;
String name01Suffix;
String dayText;
String name01Gender;
List<String> name01Classification;
int numberOfSaintsMentioned;
String regnalNumber;
String apostolicThrone;
String entryTitle;
String century;
String name01Pronoun;
Fields({
this.entryId,
this.dateId,
this.gregorianYear,
this.copticMonth,
this.copticDay,
this.eventCategory,
this.eventHeading,
this.name01Title,
this.name01NameInEnglish,
this.name01Suffix,
this.dayText,
this.name01Gender,
this.name01Classification,
this.numberOfSaintsMentioned,
this.regnalNumber,
this.apostolicThrone,
this.entryTitle,
this.century,
this.name01Pronoun,
});
factory Fields.fromJson(Map<String, dynamic> json) => Fields(
entryId: json["Entry ID"],
dateId: json["Date ID"],
gregorianYear: json["(Gregorian) Year"],
copticMonth: json["(Coptic) Month"],
copticDay: json["(Coptic) Day"],
eventCategory: List<String>.from(json["Event Category"].map((x) => x)),
eventHeading: json["Event Heading"],
name01Title: json["Name 01 - Title"],
name01NameInEnglish: json["Name 01 - Name in English"],
name01Suffix: json["Name 01 - Suffix"],
dayText: json["DayText"],
name01Gender: json["Name 01 - Gender"],
name01Classification:
List<String>.from(json["Name 01 - Classification"].map((x) => x)),
numberOfSaintsMentioned: json["Number of Saints Mentioned"],
regnalNumber:
json["Regnal Number"] == null ? null : json["Regnal Number"],
apostolicThrone:
json["Apostolic Throne"] == null ? null : json["Apostolic Throne"],
entryTitle: json["Entry Title"],
century: json["Century"] == null ? null : json["Century"],
name01Pronoun: json["Name 01 - Pronoun"] == null
? null
: json["Name 01 - Pronoun"],
);
Map<String, dynamic> toJson() => {
"Entry ID": entryId,
"Date ID": dateId,
"(Gregorian) Year": gregorianYear,
"(Coptic) Month": copticMonth,
"(Coptic) Day": copticDay,
"Event Category": List<dynamic>.from(eventCategory.map((x) => x)),
"Event Heading": eventHeading,
"Name 01 - Title": name01Title,
"Name 01 - Name in English": name01NameInEnglish,
"Name 01 - Suffix": name01Suffix,
"DayText": dayText,
"Name 01 - Gender": name01Gender,
"Name 01 - Classification":
List<dynamic>.from(name01Classification.map((x) => x)),
"Number of Saints Mentioned": numberOfSaintsMentioned,
"Regnal Number": regnalNumber == null ? null : regnalNumber,
"Apostolic Throne": apostolicThrone == null ? null : apostolicThrone,
"Entry Title": entryTitle,
"Century": century == null ? null : century,
"Name 01 - Pronoun": name01Pronoun == null ? null : name01Pronoun,
};
}
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;
Future<Record> _future;
Future<Record> _getRecords() async {
/*var response = await http.get(Uri.encodeFull("url"),
headers: {
"Authorization": "**********",
"Accept": "application/json"
});
*/
String jsonString = '''
{
"records": [
{
"id": "recHSxuQBgXAkT9HR",
"fields": {
"Entry ID": "00663",
"Date ID": "12-12",
"(Gregorian) Year": " ?",
"(Coptic) Month": "12-Mesori",
"(Coptic) Day": "14",
"Event Category": [
"Commemoration"
],
"Event Heading": "Heading01",
"Name 01 - Title": "Mr.",
"Name 01 - Name in English": "Jhon",
"Name 01 - Suffix": "23rd Pa",
"DayText": "On this day,..",
"Name 01 - Gender": "Male",
"Name 01 - Classification": [
"08 - Patriarch of Alexandria"
],
"Number of Saints Mentioned": 1,
"Regnal Number": "I",
"Apostolic Throne": "385-412",
"Entry Title": "Commemoration of "
},
"createdTime": "2020-04-27T05:30:53.000Z"
},
{
"id": "rec3gTgUKo5Co9Qi3",
"fields": {
"Entry ID": "00450",
"Date ID": "08-Paremoude - D30 - 0450",
"Century": "1st Century",
"(Gregorian) Year": "68",
"(Coptic) Month": "08-Paremoud",
"(Coptic) Day": "30",
"Event Category": [
"Martyrdom"
],
"Event Heading": "Martyrdom of ",
"Name 01 - Title": "Saint",
"Name 01 - Name in English": "Mark",
"Name 01 - Pronoun": "the",
"Name 01 - Suffix": "Evangelis",
"DayText": "On this day 2",
"Name 01 - Gender": "Male",
"Name 01 - Classification": [
"06 - Apostles Order",
"07 - Martyrs Order",
"08 - Patriarch of Alexandri"
],
"Number of Saints Mentioned": 1,
"Entry Title": "Martyrdo of the Evangelist () "
},
"createdTime": "2020-04-27T05:30:53.000Z"
}
]
}
''';
var response = http.Response(jsonString, 200);
if (response.statusCode == 200) {
return recordFromJson(jsonString);
} else {
print(response.statusCode);
}
}
@override
void initState() {
_future = _getRecords();
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: FutureBuilder(
future: _future,
builder: (context, AsyncSnapshot<Record> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('none');
case ConnectionState.waiting:
return Center(child: CircularProgressIndicator());
case ConnectionState.active:
return Text('');
case ConnectionState.done:
if (snapshot.hasError) {
return Text(
'${snapshot.error}',
style: TextStyle(color: Colors.red),
);
} else {
return ListView.builder(
itemCount: snapshot.data.records.length,
itemBuilder: (context, index) {
return Card(
elevation: 6.0,
child: Padding(
padding: const EdgeInsets.only(
top: 6.0,
bottom: 6.0,
left: 8.0,
right: 8.0),
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
snapshot.data.records[index].fields
.eventHeading,
),
Spacer(),
Text(
snapshot.data.records[index].fields
.name01NameInEnglish,
),
],
),
));
});
}
}
}));
}
}
导入“包装：颤振/材料.省道”；
将“package:http/http.dart”导入为http；
导入“dart:convert”；
Record recordFromJson（String str）=>Record.fromJson（json.decode（str））；
字符串recordToJson（记录数据）=>json.encode（data.toJson（））；
课堂记录{
列出记录；
记录({
这是我的记录，
});
工厂记录.fromJson（映射json）=>记录(
记录：List.from(
json[“records”].map（（x）=>RecordElement.fromJson（x）），
);
映射到JSON（）=>{
“记录”：List.from（records.map（（x）=>x.toJson（）），
};
}
类记录元素{
字符串id；
田地；
DateTime createdTime；
记录元素({
这个身份证，
这是我的地盘，
这个.createdTime，
});
factory RecordElement.fromJson（映射json）=>RecordElement(
id:json[“id”]，
fields:fields.fromJson（json[“fields”]），
createdTime:DateTime.parse（json[“createdTime”]），
);
映射到JSON（）=>{
“id”：id，
“字段”：fields.toJson（），
“createdTime”：createdTime.toIso8601String（），
};
}
类字段{
字符串入口ID；
字符串日期ID；
弦格里高利年；
弦连音月；
弦科普提克日；
列出事件类别；
字符串事件标题；
字符串名称01标题；
字符串名称01nameinenglish；
字符串名称后缀；
字符串dayText；
字符串名称和性别；
清单名称和分类；
提及的整数；
字符串regnalNumber；
字符串撇号；
字符串入口标题；
弦乐世纪；
串名代词；
田地({
这是恩特里德，
这是dateId，
今年，格雷戈里年，
这个月，
这一天，
这个.eventCategory，
这是一个事件标题，
这个.name01标题，
这是英语中的，
这个.name01后缀，
这是dayText，
这是性别，
这是我的分类，
上面提到的这个数字，
这个.regnalNumber，
这个，使徒时代，
这个.入口标题，
这个世纪,，
这个.name01代词，
});
工厂字段.fromJson（映射json）=>字段(
entryId:json[“条目ID”]，
dateId:json[“日期ID”]，
公历年：json[“（公历）年]，
科普特月：json[“（科普特）月”]，
科普特语日：json[“（科普特语）日”]，
eventCategory:List.from（json[“事件类别”].map（（x）=>x）），
eventHeading:json[“事件标题”]，
name01Title:json[“Name 01-Title”]，
name01 nameinenglish:json[“Name 01-Name in English”]，
name01后缀：json[“Name 01-Suffix”]，
dayText:json[“dayText”]，
name01Gender:json[“Name 01-Gender”]，
名称01分类：
List.from（json[“Name 01-Classification”].map（（x）=>x）），
NumberOfsantsMonted:json[“提及的圣徒数量”]，
注册表号：
json[“Regnal Number”]==null？null:json[“Regnal Number”]，
变节时期：
json[“使徒宝座”]==null？null:json[“使徒宝座”]，
entryTitle:json[“条目标题”]，
世纪：json[“世纪”]==null？null:json[“世纪”]，
name01代词：json[“Name 01-deon”]==null
无效的
：json[“名称01-代词”]，
);
映射到JSON（）=>{
“入口ID”：入口ID，
“日期ID”：日期ID，
“（公历）年”：公历年，
“（科普特）月”：科普特月，
“科普特日”：科普特日，
“事件类别”：列表.from（eventCategory.map（（x）=>x）），
“事件标题”：事件标题，
“名称01-标题”：名称01标题，
“名称01-英语名称”：名称01英语名称，
“名称01-后缀”：名称01后缀，
“DayText”：DayText，
“姓名01-性别”：姓名01性别，
“名称01-分类”：
List.from（name01Classification.map（（x）=>x）），
“提到的圣徒人数”：提到的圣徒人数，
“Regnal Number”：regnalNumber==null？