网站群建设指导意见,云南人社,企业免费网站制作比较好的,核酸检测是否收费对于网络请求返回的 Json 数据#xff0c;一般会进行如下解析#xff1a;
将 Json String 解析为 MapString, dynamic将 Json String 解析为 Dart Model
发起一个返回 Json String 的网络请求
import package:http/http.dart as http;void main() {_doGet();
}_do…对于网络请求返回的 Json 数据一般会进行如下解析
将 Json String 解析为 MapString, dynamic将 Json String 解析为 Dart Model
发起一个返回 Json String 的网络请求
import package:http/http.dart as http;void main() {_doGet();
}_doGet() async {var url Uri.parse(https://cx.shouji.360.cn/phonearea.php?number17688888888);var response await http.get(url);if (response.statusCode 200) {//请求成功print(请求成功);String jsonStr response.body;print(jsonStr); // {code:0,data:{province:广东,city:广州,sp:联通}}} else {//请求失败print(请求失败);print(错误码${response.statusCode});print(错误信息${response.body});}
}该请求返回的数据结构为
{code:0,data:{province:广东,city:广州,sp:联通}
}1、Json String 转 MapString, dynamic
引入
import dart:convert;jsonDecode()
_json2Map(String jsonStr) {MapString, dynamic map1 jsonDecode(jsonStr);print(map1[code]); // 0print(map1[data]); // {province: 广东, city: 广州, sp: 联通}MapString, dynamic map2 map1[data];print(map2[province]); // 广东print(map2[city]); // 广州print(map2[sp]); // 联通
}2、Json String 转 Dart Model
Json String 转 Model 中 Model 的要求
字段不能为私有普通构造函数声明为 XXX.fromJson 的命名构造函数声明为 MapString, dynamic toJson() 成员函数
Model
{code:0,data:{province:广东,city:广州,sp:联通}
}class Location {String? province;String? city;String? sp;Location({this.province, this.city, this.sp});Location.fromJson(MapString, dynamic json) {province json[province];city json[city];sp json[sp];}MapString, dynamic toJson() {final MapString, dynamic data String, dynamic{};data[province] province;data[city] city;data[sp] sp;return data;}
}//4、声明为MapString, dynamic toJson成员函数
class DataModel {int? code;Location? data;DataModel({this.code, this.data});DataModel.fromJson(MapString, dynamic json) {code json[code];//注意此处传值data Location.fromJson(json[data]);}MapString, dynamic toJson() {final MapString, dynamic d String, dynamic{};d[code] code;//注意此处传值d[data] data?.toJson();return d;}
}转换
_json2Model(String jsonStr) {MapString, dynamic map jsonDecode(jsonStr);DataModel model DataModel.fromJson(map);print(model.code); // 0print(model.data?.toJson()); // {province: 广东, city: 广州, sp: 联通}print(model.data?.province); // 广东print(model.data?.city); // 广州print(model.data?.sp); // 联通
}在线转换工具
Json String 转 Dart Model 在线工具Í 3、界面实例 main.dart
import package:flutter/material.dart;
import Json2MapModelPage.dart;void main() {runApp(const MyApp());
}class MyApp extends StatelessWidget {const MyApp({super.key});overrideWidget build(BuildContext context) {return MaterialApp(title: Leon Demo,theme: ThemeData(primarySwatch: Colors.blue,),home: const Json2MapModelPage(),);}
}Json2MapModelPage.dart
import dart:convert;
import package:flutter/material.dart;
import DataModel.dart;class Json2MapModelPage extends StatefulWidget {const Json2MapModelPage({super.key});overrideStateJson2MapModelPage createState() _Json2MapModelPageState();
}class _Json2MapModelPageState extends StateJson2MapModelPage {final String _jsonStr {code:0,data:{province:广东,city:广州,sp:联通}};var showResultJson2Map ;var showResultJson2Model ;overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: const Text(Json 解析 Demo),),body: Column(children: [_json2MapBtn(),Text(json 2 map 解析结果:\n $showResultJson2Map),_json2ModelBtn(),Text(json 2 Model 解析结果:\n $showResultJson2Model),],),);}_json2MapBtn() {return ElevatedButton(onPressed: _json2map, child: const Text(Json 转 Map));}void _json2map() {MapString, dynamic map jsonDecode(_jsonStr);setState(() {showResultJson2Map code: ${map[code]}\ndata: ${map[data]}\nprovince: ${map[data][province]} city: ${map[data][city]} sp: ${map[data][sp]};});}_json2ModelBtn() {return ElevatedButton(onPressed: _json2Model, child: const Text(Json 转 Model));}void _json2Model() {PhoneModel model PhoneModel.fromJson(jsonDecode(_jsonStr));setState(() {showResultJson2Model code: ${model.code}\ndata: ${model.data?.toJson()}\nprovince: ${model.data?.province} city: ${model.data?.city} sp: ${model.data?.sp};});}
}DataModel.dart
利用在线转换工具转换
///
/// Code generated by jsonToDartModel https://ashamp.github.io/jsonToDartModel/
///
class PhoneModelData {
/*
{province: 广东,city: 广州,sp: 联通
}
*/String? province;String? city;String? sp;PhoneModelData({this.province,this.city,this.sp,});PhoneModelData.fromJson(MapString, dynamic json) {province json[province]?.toString();city json[city]?.toString();sp json[sp]?.toString();}MapString, dynamic toJson() {final data String, dynamic{};data[province] province;data[city] city;data[sp] sp;return data;}
}class PhoneModel {
/*
{code: 0,data: {province: 广东,city: 广州,sp: 联通}
}
*/String? code;PhoneModelData? data;PhoneModel({this.code,this.data,});PhoneModel.fromJson(MapString, dynamic json) {code json[code]?.toString();data (json[data] ! null) ? PhoneModelData.fromJson(json[data]) : null;}MapString, dynamic toJson() {final data String, dynamic{};data[code] code;if (data ! null) {data[data] this.data!.toJson();}return data;}
}
