flutter - Json on Body的HTTP POST方法-Flutter/Dart

Question

身上带有Json的 HTTP POST方法-Flutter / Dart:

 Future<List<dynamic>> requestMethodtwo() async {
    var url = "";
    var body = json.encode({"finYr": "6", "UserID": "1"});
    setState(() {
      isLoading = true;
    });
    Map<String, String> headers = {
      'Content-type': 'application/json',
      'Accept': 'application/json',
    };
    final response =
    await http.post(url, body: body, headers: headers);
    final responseJson = json.decode(response.body);
    final items = json.decode(response.body).cast<Map<String, dynamic>>();
    List<dynamic> listOfString = items.map((json) {
      return json['rows'];
    }).toList();
    print(listOf[enter image description here][1]String);
    print(response.statusCode);
    if (response.statusCode == 200) {
    }
    else {
      throw Exception('Failed to load internet');
    }
    return listOfString;
  }

My Api Call 
[
    {
        "status": 200,
        "msg": "Ok",
        "rows": [
            {
                "lid": "11031",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            },
            {
               "lid": "11032",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            },
            {
                 "lid": "11034",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            }
        ],
        "sql": "gg",
        "reserved": null
    }
]

Answer 1

您可以在下面复制粘贴运行完整代码
假设您的响应JSON字符串是这样的，它是数组

[
    {
        "status": 200,
        "msg": "Ok",
        "rows": [
            {
                "lid": "11031",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            },
            {
               "lid": "11032",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            },
            {
                 "lid": "11034",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            }
        ],
        "sql": "gg",
        "reserved": null
    }
]

你可以解析相关的类

// To parse this JSON data, do
//
//     final payload = payloadFromJson(jsonString);

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 {
    int status;
    String msg;
    List<Row> rows;
    String sql;
    dynamic reserved;

    Payload({
        this.status,
        this.msg,
        this.rows,
        this.sql,
        this.reserved,
    });

    factory Payload.fromJson(Map<String, dynamic> json) => Payload(
        status: json["status"],
        msg: json["msg"],
        rows: List<Row>.from(json["rows"].map((x) => Row.fromJson(x))),
        sql: json["sql"],
        reserved: json["reserved"],
    );

    Map<String, dynamic> toJson() => {
        "status": status,
        "msg": msg,
        "rows": List<dynamic>.from(rows.map((x) => x.toJson())),
        "sql": sql,
        "reserved": reserved,
    };
}

class Row {
    String lid;
    String companyName;
    String leadSourceName;
    String leadSourceValue;

    Row({
        this.lid,
        this.companyName,
        this.leadSourceName,
        this.leadSourceValue,
    });

    factory Row.fromJson(Map<String, dynamic> json) => Row(
        lid: json["lid"],
        companyName: json["CompanyName"],
        leadSourceName: json["LeadSourceName"],
        leadSourceValue: json["LeadSourceValue"],
    );

    Map<String, dynamic> toJson() => {
        "lid": lid,
        "CompanyName": companyName,
        "LeadSourceName": leadSourceName,
        "LeadSourceValue": leadSourceValue,
    };
}

并显示ListView与

loading == true
                ? CircularProgressIndicator()
                : Expanded(
                    flex: 1,
                    child: ListView.builder(
                        padding: const EdgeInsets.all(8),
                        itemCount: payloadList == null ? 0 : payloadList[0].rows.length,
                        itemBuilder: (BuildContext context, int index) {
                          return Container(
                            height: 50,
                            child: Center(
                                child: Text(
                                    'lid ${payloadList[0].rows[index].lid}')),
                          );
                        }),
                  ),

工作演示



完整的代码

import 'package:flutter/material.dart';
// To parse this JSON data, do
//
//     final payload = payloadFromJson(jsonString);

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 {
  int status;
  String msg;
  List<Row> rows;
  String sql;
  dynamic reserved;

  Payload({
    this.status,
    this.msg,
    this.rows,
    this.sql,
    this.reserved,
  });

  factory Payload.fromJson(Map<String, dynamic> json) => Payload(
        status: json["status"],
        msg: json["msg"],
        rows: List<Row>.from(json["rows"].map((x) => Row.fromJson(x))),
        sql: json["sql"],
        reserved: json["reserved"],
      );

  Map<String, dynamic> toJson() => {
        "status": status,
        "msg": msg,
        "rows": List<dynamic>.from(rows.map((x) => x.toJson())),
        "sql": sql,
        "reserved": reserved,
      };
}

class Row {
  String lid;
  String companyName;
  String leadSourceName;
  String leadSourceValue;

  Row({
    this.lid,
    this.companyName,
    this.leadSourceName,
    this.leadSourceValue,
  });

  factory Row.fromJson(Map<String, dynamic> json) => Row(
        lid: json["lid"],
        companyName: json["CompanyName"],
        leadSourceName: json["LeadSourceName"],
        leadSourceValue: json["LeadSourceValue"],
      );

  Map<String, dynamic> toJson() => {
        "lid": lid,
        "CompanyName": companyName,
        "LeadSourceName": leadSourceName,
        "LeadSourceValue": leadSourceValue,
      };
}

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;
  List<Payload> payloadList;
  bool loading = false;
  String jsonString = '''
  [
    {
        "status": 200,
        "msg": "Ok",
        "rows": [
            {
                "lid": "11031",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            },
            {
               "lid": "11032",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            },
            {
                 "lid": "11034",
                "CompanyName": "WALLS ICE CREAM",
                "LeadSourceName": "Website",
                "LeadSourceValue": "ONLINE ADS"
            }
        ],
        "sql": "gg",
        "reserved": null
    }
]
  ''';

  void _incrementCounter() {
    setState(() {
      loading = true;
      payloadList = payloadFromJson(jsonString);
      loading = false;
      // 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>[
            loading == true
                ? CircularProgressIndicator()
                : Expanded(
                    flex: 1,
                    child: ListView.builder(
                        padding: const EdgeInsets.all(8),
                        itemCount: payloadList == null ? 0 : payloadList[0].rows.length,
                        itemBuilder: (BuildContext context, int index) {
                          return Container(
                            height: 50,
                            child: Center(
                                child: Text(
                                    'lid ${payloadList[0].rows[index].lid}')),
                          );
                        }),
                  ),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_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.
    );
  }
}