检索承载令牌邮递员扑腾

问题描述

我在Flutter项目中创建了一个简单的登录功能，只需输入电子邮件和密码即可使用。 现在，我想从邮递员中添加令牌承载功能，以便即使应用程序已关闭，用户仍然可以登录。 我想问的是如何将令牌持有者的值添加到共享首选项功能中。

这是我的登录代码。

login() async {
final response = await http.post(
  "https://api.batulima.com//v1_ships/login_app",body: {"email": email,"password": password},);
final data = jsonDecode(response.body);
String status = data['status'];
String message = data['message'];
if (status == "success") {
  Navigator.of(context).pushReplacement(PageRouteBuilder(
      pageBuilder: (_,__,___) => new bottomNavBar(),transitionDuration: Duration(milliseconds: 600),transitionsBuilder:
          (_,Animation<double> animation,Widget child) {
        return Opacity(
          opacity: animation.value,child: child,);
      }));
  print(message);
} else {
  print(message);
 }
}

这是我的邮递员json结构

{
"status": "success","data": {
    "apikey": "ak5neGVDd3h4M0lVeVF2b2hXWjg3OEZMYUlvcWExTXRqQ21xSmJGWQ==","id_user": 49,"id_role": "8","name_role": "Ship Owner","email": "[e-mail]","phone": "082258785595","saldo": "0","photo": "https://batulimee.com/foto_user/avatar.png"
},"message": "login successfully "
}

我应该添加些什么以便能够从apikey检索值？

下面是我在main.dart中创建的getpref。如果为null，则从初始屏幕开始到登录页面。并且如果该apikey已保存，它会进入bottomnavbar页面

Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
SharedPreferences prefs = await SharedPreferences.getInstance();
var apikey = prefs.getString('apikey');
print(apikey);
runApp(MaterialApp(
  debugShowCheckedModeBanner: false,home: apikey == null ? splash() : bottomNavBar()));
}

解决方法

您可以在下面复制粘贴运行完整代码
要在JSON中检索apikey的值，您可以执行data['data']['apikey']
代码段

String apiKey = data['data']['apikey'];
print("apiKey $apiKey");

SharedPreferences prefs = await SharedPreferences.getInstance();   
await prefs.setString('apiKey',apiKey);

String getedApiKey = await prefs.getString('apiKey');
print(getedApiKey);

输出

I/flutter (22942): apiKey ak5neGVDd3h4M0lVeVF2b2hXWjg3OEZMYUlvcWExTXRqQ21xSmJGWQ==
I/flutter (22942): ak5neGVDd3h4M0lVeVF2b2hXWjg3OEZMYUlvcWExTXRqQ21xSmJGWQ==
I/flutter (22942): login successfully 

完整代码

import 'dart:convert';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

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;

  login() async {
    /*final response = await http.post(
      "https://api.batulima.com//v1_ships/login_app",body: {"email": email,"password": password},);*/
    String jsonString = '''
    {
"status": "success","data": {
    "apikey": "ak5neGVDd3h4M0lVeVF2b2hXWjg3OEZMYUlvcWExTXRqQ21xSmJGWQ==","id_user": 49,"id_role": "8","name_role": "Ship Owner","email": "[e-mail]","phone": "082258785595","saldo": "0","photo": "https://batulimee.com/foto_user/avatar.png"
},"message": "login successfully "
}
    ''';
    final response = http.Response(jsonString,200);

    final data = jsonDecode(response.body);
    String status = data['status'];
    String message = data['message'];
    String apiKey = data['data']['apikey'];
    print("apiKey $apiKey");

    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setString('apiKey',apiKey);

    String getedApiKey = await prefs.getString('apiKey');
    print(getedApiKey);

    if (status == "success") {
      /* Navigator.of(context).pushReplacement(PageRouteBuilder(
          pageBuilder: (_,__,___) => new bottomNavBar(),transitionDuration: Duration(milliseconds: 600),transitionsBuilder:
              (_,Animation<double> animation,Widget child) {
            return Opacity(
              opacity: animation.value,child: child,);
          }));*/
      print(message);
    } else {
      print(message);
    }
  }

  @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: login,tooltip: 'Increment',child: Icon(Icons.add),);
  }
}