我正在创建Flutter应用，并且试图将数据插入数据库中。我试图解决错误。但我找不到错误。为此，我从应用程序连接到服务器上的.php文件。但是我在Android Studio中看到了异常。
这是我的飞镖文件。
颤振：
import 'dart:convert';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:http/http.dart' as http;
class Register extends StatefulWidget {
Register() : super();
@override
_RegisterState createState() => _RegisterState();
}
class _RegisterState extends State<Register>{
TextEditingController voterIdCTRL, usernameCTRL, nameCTRL, passwordCTRL,
confirm_passCTRL, emailCTRL, ageCTRL, phone_numCTRL;
@override
void initState(){
super.initState();
voterIdCTRL = new TextEditingController();
usernameCTRL = new TextEditingController();
nameCTRL = new TextEditingController();
passwordCTRL = new TextEditingController();
confirm_passCTRL = new TextEditingController();
emailCTRL = new TextEditingController();
ageCTRL = new TextEditingController();
phone_numCTRL = new TextEditingController();
}
Future registerUser() async{
var theUrl = 'http://192.168.0.158/fyp_db/register.php';
var input = {
"voter_id" : voterIdCTRL.text,
"username" : usernameCTRL.text,
"name" : nameCTRL.text,
"password" : passwordCTRL.text,
"confirm_password" : confirm_passCTRL.text,
"email" : emailCTRL.text,
"age" : ageCTRL.text,
"phone_number" : phone_numCTRL.text,
};
var response = await http.post(theUrl, body: input);
//String data = json.decode(response.body);
if(jsonDecode(response.body.toString()) == "Account already exists!"){
Fluttertoast.showToast(
msg: "Username Exists. Please try again!",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
backgroundColor: Colors.red,
textColor: Colors.white,
fontSize: 16.0
);
}else{
if(jsonDecode(response.body.toString()) == "Success"){
Fluttertoast.showToast(
msg: "Register Successful!",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
fontSize: 16.0
);
}else {
Fluttertoast.showToast(
msg: "Error, Please try again!",
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1,
backgroundColor: Colors.green,
textColor: Colors.white,
fontSize: 16.0
);
}
}
}
@override
Widget build(BuildContext context) {
return new Scaffold(
resizeToAvoidBottomPadding: false,
body: ListView(
// crossAxisAlignment: CrossAxisAlignment.start,
padding: EdgeInsets.all(15),
children: <Widget>[
Container(
child: Stack(
children: <Widget>[
Container(
padding: EdgeInsets.fromLTRB(15.0, 110.0, 0.0, 0.0),
child: Text(
'Create An',
style:
TextStyle(fontSize: 50.0, fontWeight: FontWeight.bold),
),
),
Container(
padding: EdgeInsets.fromLTRB(15.0, 170.0, 0.0, 0.0),
child: Text(
'New Account',
style:
TextStyle(fontSize: 50.0, fontWeight: FontWeight.bold),
),
),
Container(
padding: EdgeInsets.fromLTRB(315.0, 170.0, 0.0, 0.0),
child: Text(
'.',
style: TextStyle(
fontSize: 50.0,
fontWeight: FontWeight.bold,
color: Colors.indigoAccent),
),
)
],
),
),
Container(
padding: EdgeInsets.only(top: 35.0, left: 20.0, right: 20.0),
child: Column(
children: <Widget>[
TextField(
controller: voterIdCTRL,
decoration: InputDecoration(
labelText: 'VOTER ID',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
),
SizedBox(height: 10.0),
TextField(
controller: usernameCTRL,
decoration: InputDecoration(
hintText: 'Username',
labelText: 'USERNAME',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
),
SizedBox(height: 10.0),
TextField(
controller: nameCTRL,
decoration: InputDecoration(
hintText: 'Name',
labelText: 'NAME',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
),
SizedBox(height: 10.0),
TextField(
controller: passwordCTRL,
decoration: InputDecoration(
hintText: 'Password',
labelText: 'PASSWORD',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
obscureText: true,
),
SizedBox(height: 10.0),
TextField(
controller: confirm_passCTRL,
decoration: InputDecoration(
hintText: 'Confirm Password',
labelText: 'CONFIRM PASSWORD ',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
obscureText: true,
),
SizedBox(height: 10.0),
TextField(
controller: emailCTRL,
decoration: InputDecoration(
hintText: 'Email',
labelText: 'EMAIL',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
),
SizedBox(height: 10.0),
TextField(
controller: ageCTRL,
decoration: InputDecoration(
hintText: 'Age',
labelText: 'AGE',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
),
SizedBox(height: 10.0),
TextField(
controller: phone_numCTRL,
decoration: InputDecoration(
hintText: 'Phone Number',
labelText: 'PHONE NUMBER',
labelStyle: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
color: Colors.grey),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: Colors.indigoAccent))),
),
SizedBox(height: 50.0),
Container(
height: 50.0,
child: Material(
borderRadius: BorderRadius.circular(30.0),
shadowColor: Colors.indigo,
color: Colors.indigoAccent,
elevation: 7.0,
child: MaterialButton(
onPressed: () => registerUser(),
child: Center(
child: Text(
'REGISTER',
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontFamily: 'Montserrat'),
),
),
),
)),
SizedBox(height: 20.0),
Container(
height: 50.0,
color: Colors.transparent,
child: Container(
decoration: BoxDecoration(
border: Border.all(
color: Colors.black,
style: BorderStyle.solid,
width: 1.0),
color: Colors.transparent,
borderRadius: BorderRadius.circular(30.0)),
child: InkWell(
onTap: () {
Navigator.of(context).pop();
},
child:
Center(
child: Text('Go Back',
style: TextStyle(
fontWeight: FontWeight.bold,
fontFamily: 'Montserrat')),
),
),
),
),
SizedBox(height: 30.0),
],
)),
]));
}
}
这些是我的.PHP文件。
PHP： connection.php
<?php
$dbserver = "localhost";
$username = "root";
$password = "";
$dbname = "fypdb";
// Create connection
//$conn = new PDO('mysql:host=localhost;dbname=fypdb', $username, $password);
$connect = new mysqli($dbserver, $username, $password, $dbname);
if($connect){
echo json_encode('Connected successfully');
}else{
echo $exc -> getMessage();
die("Connection failed : " . $conn -> connect_error);
}
?>
register.php
<?php
require("connection.php");
$voter_id = $_POST["voter_id"];
$username = $_POST["username"];
$password = $_POST["password"];
$confirm_password = $_POST["confirm_password"];
$email = $_POST["email"];
$age = $_POST["age"];
$name = $_POST["name"];
$phone_number = $_POST["phone_number"];
$profile_pic = $_POST["profile_pic"];
$query = "SELECT * FROM voter_profile WHERE email = '$email'";
$res = mysqli_query($connect,$query);
$data = mysqli_fetch_array($res);
if($data[0] > 1){
echo json_encode("Account already exists!");
}else{
$query = "INSERT INTO voter_profile(voter_id, username, password, confirm_password, email, age, name, phone_number, profile_pic)
VALUES ('$voter_id', '$username', '$password', '$confirm_password', '$email', '$age', '$name', '$phone_number', NULL)";
$res = mysqli_query($query);
if($res){
echo json_encode("Success");
}else{
echo json_encode("Error");
}
}
?>
错误：
E/flutter (16663): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: FormatException: Unexpected character (at character 25)
E/flutter (16663): "Connected successfully"<br />
E/flutter (16663): ^
E/flutter (16663):
E/flutter (16663): #0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1404:5)
E/flutter (16663): #1 _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:934:48)
E/flutter (16663): #2 _parseJson (dart:convert-patch/convert_patch.dart:40:10)
E/flutter (16663): #3 JsonDecoder.convert (dart:convert/json.dart:505:36)
E/flutter (16663): #4 JsonCodec.decode (dart:convert/json.dart:156:41)
E/flutter (16663): #5 jsonDecode (dart:convert/json.dart:96:10)
E/flutter (16663): #6 _RegisterState.registerUser (package:test_app/register.dart:47:8)
E/flutter (16663): <asynchronous suspension>
E/flutter (16663): #7 _RegisterState.build.<anonymous closure> (package:test_app/register.dart:237:48)
E/flutter (16663): #8 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
E/flutter (16663): #9 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1111:38)
E/flutter (16663): #10 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
E/flutter (16663): #11 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
E/flutter (16663): #12 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
E/flutter (16663): #13 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:259:7)
E/flutter (16663): #14 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
E/flutter (16663): #15 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:362:20)
E/flutter (16663): #16 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
E/flutter (16663): #17 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
E/flutter (16663): #18 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
E/flutter (16663): #19 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
E/flutter (16663): #20 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
E/flutter (16663): #21 _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter (16663): #22 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (16663): #23 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (16663): #24 _invoke1 (dart:ui/hooks.dart:265:10)
E/flutter (16663): #25 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)
E/flutter (16663):
答案 0 :(得分：1)
您需要将input编码为json。
var input = {
"voter_id" : voterIdCTRL.text,
"username" : usernameCTRL.text,
"name" : nameCTRL.text,
"password" : passwordCTRL.text,
"confirm_password" : confirm_passCTRL.text,
"email" : emailCTRL.text,
"age" : ageCTRL.text,
"phone_number" : phone_numCTRL.text,
};
// Here is important
var body = json.encode(input);
var response = await http.post(theUrl, body: body);
您可以从official document中阅读更多内容。
答案 1 :(得分：0)
下面的代码您的连接是成功的，它不是数组对象 json_encode 解码函数仅用于 aaray 对象，因此删除 joson_encode 和 flutter 文件删除 json_decode....
<?php
$dbserver = "localhost";
$username = "root";
$password = "";
$dbname = "fypdb";
// Create connection
//$conn = new PDO('mysql:host=localhost;dbname=fypdb', $username, $password);
$connect = new mysqli($dbserver, $username, $password, $dbname);
if($connect){
echo('Connected successfully');
}else{
echo $exc -> getMessage();
die("Connection failed : " . $conn -> connect_error);
}
?>