使用 flutter 连接到端点时，它返回错误 500，旁边是过期时间变量，现在只有当我发送用户名和密码时才会发生这种情况，问题是，使用 PostMan 的相同信息，结果是代码 200 和所有相应的变量。可能是什么问题？
基本上将 flutter 与 Android Studio 和 postman 结合使用
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:async';
import 'package:loginqr/post_model.dart';
import 'dart:io';
import 'package:loginqr/SignIn.dart';
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 applicatio
// 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: 'aa',),
);
}
}
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;
void _incrementCounter() {
setState(() {
// 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: MyCustomFrom(),
// This trailing comma makes auto-formatting nicer for build methods.
);
}
}
class MyCustomFrom extends StatefulWidget{
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return MyCustomFromState();
}
}
class MyCustomFromState extends State<MyCustomFrom> {
Future<String> getData() async {
final response = await http.post(
Uri.encodeFull("Example End Point login"),
body: {
"username": user,
"password": password
},
);
//application/json
// print(response.statusCode);
print(response.body);
// print(response.toStri()ng());
}
String _deviceid = 'Unknown';
String user = '';
String password = '';
TextEditingController controller = new TextEditingController();
TextEditingController controller2 = new TextEditingController();
@override
void dispose() {
controller.dispose();
controller2.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
final username = TextFormField(
controller: controller,
keyboardType: TextInputType.text,
autofocus: false,
decoration: InputDecoration(
hintText: "Username",
hintStyle: TextStyle(fontSize: 16.0),
contentPadding: EdgeInsets.fromLTRB(20.0, 0.0, 20.0, 10.0),
border:
UnderlineInputBorder(borderRadius: BorderRadius.circular(32.0))),
);
final password = TextFormField(
controller: controller2,
autofocus: false,
obscureText: true,
decoration: InputDecoration(
hintText: "Password",
hintStyle: TextStyle(fontSize: 16.0),
contentPadding: EdgeInsets.fromLTRB(20.0, 25.0, 20.0, 10.0),
border:
UnderlineInputBorder(borderRadius: BorderRadius.circular(32.0))),
);
final loginButton = Padding(
padding: EdgeInsets.symmetric(vertical: 25.0),
child: Material(
borderRadius: BorderRadius.circular(30.0),
shadowColor: Colors.blueAccent.shade100,
elevation: 10.0,
child: MaterialButton(
minWidth: 200.0,
height: 42.0,
color: Colors.blueAccent,
onPressed: (){
getData();
},
child: Text(
"Login",
style: TextStyle(color: Colors.white),
),
),
),
);
return Form(
child: new Center(
child: ListView(
padding: EdgeInsets.only(left: 24.0, right: 24.0, top: 10.0),
children: <Widget>[
username,
SizedBox(height: 8.0),
password,
SizedBox(height: 24.0),
loginButton
]),
),
);
}
}
使用 tue 代码 print(response.body); 输出是：
I/flutter (21983): {"timestamp":1563220761561,"status":500,"error":"Internal Server Error","exception":"java.lang.IllegalStateException","message":"java.lang.IllegalStateException: STREAMED","path":"/api/login"}
使用邮递员 tue 输出是：
{"access-token":"eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJBRE1JTklTVFJBRE9SIiwiZXhwIjoxNTYzMzAwOTE3fQ.MMTqHaROX69WEDrCdHK9DFToA49CeraVzQC4zGn08CrSz3GCiA7HabbFaZAZLeKtoK0Z_-OulPMoVgZhCW9R7g","status":true,"expire":1563300917916}
这是您在上面的评论中所说的 cURL 请求，格式更好一点：
curl -X POST \
URLSample..orSomething \
-H 'Content-Type: application/json' \
-H 'Postman-Token: a3621ffc-f029-4973-b015-c7fea1c2b429' \
-H 'cache-control: no-cache' \
-d '{ "username" : "administrador", "password" : "admin2010" }'
正如您通过
Content-Type现在查看您的代码，我们可以开始理解为什么它不起作用。您没有在请求中设置内容类型标头，但更重要的是您没有发送 JSON。
这是您的请求正文：
body: {
"username": user,
"password": password
},
这实际上是一个飞镖
Map<String, dynamic>如果 body 是一个 Map，则使用编码将其编码为表单字段。请求的content-type将被设置为“application/x-www-form-urlencoded”；这不能被覆盖。
因此，要修复您的请求，我们应该设置
Content-Type// we import the convert library to access jsonEncode
import 'dart:convert';
Map<String, dynamic> requestPayload = {
"username": user,
"password": password,
};
final response = await http.post(
Uri.encodeFull("Example End Point login"),
body: jsonEncode(requestPayload),
headers: {'Content-Type': 'application/json'},
);
您确定请求方法是Post吗？如果不是，可能就是错误原因。 检查一下：
await http.post我也有同样的问题，请问解决了吗？谢谢