取回不记名令牌邮递员扑腾

Question

我在我的 Flutter 项目中创建了一个简单的登录功能，它只需输入电子邮件和密码即可工作。 现在我想从邮递员添加令牌持有者功能，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承载值放入共享偏好函数中。

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": "afriansyahm86@gmail.com",
    "phone": "082258785595",
    "saldo": "0",
    "photo": "https://batulimee.com/foto_user/avatar.png"
},
"message": "login successfully "
}

我应该添加什么才能从 apikey 检索值？

下面是我在 main.dart 中创建的 getpref。如果为空，则从初始屏幕开始到登录页面。如果 apikey 已保存，则进入底部导航栏页面

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()));
}

Answer 1

您可以在下面复制粘贴运行完整代码
要检索 JSON 中 apikey 的值，您可以执行 data['data']['apikey']
代码sn-p

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": "afriansyahm86@gmail.com",
    "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),
      ),
    );
  }
}