post请求Spring boot和Flutter应用程序时出现错误404

Question

我尝试使用Springboot和Flutter技术创建一个移动登录页面。我是新开发的。 Tomcat正常启动并连接到db。我使用模拟器 Pixel 4 api 31 来测试我的应用程序。

dart 文件中的 url http://192.168.2.6:8080/users/login' 是否正确？当按下登录按钮时

I/flutter ( 7730): Error: 404

出现了。

我也尝试将login_page.dart文件中的url更改为'http://localhost:8080/users/login'、'http://127.0.0.1:8080/users/login'和http://'127.0 .0.2':8080/users/login' 但我收到连接拒绝错误。 这是代码：

应用程序.java

@SpringBootApplication
@EnableJpaRepositories("org.example.repository.*")
@ComponentScan(basePackages = { "org.example.controller.*" })
@EntityScan("org.example.model.*")
public class App
{
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

用户控制器.java

@RestController
@RequestMapping("/users")

public class UserController {

    private final UserService userService;
    private UserMapper userMapper; // Inject UserMapper here

    @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }

    @PostMapping("/register") // in mobile app doesn't need all users should be registered by corresponding gym
    public ResponseEntity<UserDTO> registerUser(@RequestBody UserDTO userDTO) {
        // Receive and validate userDTO from the client

        // Map userDTO to a User entity
        User userEntity = userService.registerUser(userDTO);

        // Map the resulting User entity to a UserDTO for the response
        UserDTO registeredUserDTO = UserMapper.mapToDTO(userEntity);

        return ResponseEntity.ok(registeredUserDTO);
    }

    @PostMapping("/login")
    public ResponseEntity<UserDTO> loginUser(@RequestBody UserDTO userDTO) throws AuthenticationException {
        // Validate the loginRequest, e.g., check for null values

        // Map userDTO to a User entity
        UserDTO loginUserDTO = userService.loginUser(userDTO);

        return ResponseEntity.ok(loginUserDTO);
    }

应用程序.属性

server.port=8080
server.tomcat.threads.max=200
server.connection-timeout=5s
server.max-http-header-size=8KB
server.tomcat.max-swallow-size=2MB
server.tomcat.max-http-post-size=2MB
spring.datasource.url=jdbc:mysql://localhost:3306/testdbgymapp?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect
spring.jpa.hibernate.ddl-auto=update

login_page.dart（Flutter 应用程序）

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

import 'home_page.dart';

class LoginDemo extends StatefulWidget {
  @override
  _LoginDemoState createState() => _LoginDemoState();
}

class _LoginDemoState extends State<LoginDemo> {
  final TextEditingController usernameController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();

  Future<void> loginUser() async {
    final response = await http.post(
      Uri.parse('http://192.168.2.6:8080/users/login'),
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
      body: jsonEncode(<String, String>{
        'username': usernameController.text,
        'password': passwordController.text,
      }),
    );

    if (response.statusCode == 200) {
      // Successful login
      Navigator.push(
          context, MaterialPageRoute(builder: (_) => HomePage()));
    } else if (response.statusCode == 400) {
      // Invalid username or password
      print('Invalid username or password');
    } else {
      // Handle other error cases
      print('Error: ${response.statusCode}');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        title: Text("Login Page"),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.only(top: 60.0),
              child: Center(
                child: Container(
                    width: 200,
                    height: 150,
                    decoration: BoxDecoration(
                        color: Colors.red,
                        borderRadius: BorderRadius.circular(50.0)),
                    child: Image.asset('asset/images/gymApp-logo.png')),
              ),
            ),
            Padding(
              //padding: const EdgeInsets.only(left:15.0,right: 15.0,top:0,bottom: 0),
              padding: EdgeInsets.symmetric(horizontal: 15),
              child: TextField(
                decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: 'Email',
                    hintText: 'Enter valid email id as [email protected]'),
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(
                  left: 15.0, right: 15.0, top: 15, bottom: 0),
              //padding: EdgeInsets.symmetric(horizontal: 15),
              child: TextField(

                obscureText: true,
                decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: 'Password',
                    hintText: 'Enter secure password'),
              ),
            ),
            TextButton(
              onPressed: (){
                //TODO FORGOT PASSWORD SCREEN GOES HERE
              },
              child: Text(
                'Forgot Password',
                style: TextStyle(color: Colors.blue, fontSize: 15),
              ),
            ),
            Container(
              height: 50,
              width: 250,
              decoration: BoxDecoration(
                  color: Colors.blue, borderRadius: BorderRadius.circular(20)),
                        child: TextButton(
                onPressed: () {
                  loginUser();
                },
                child: Text(
                  'Login',
                  style: TextStyle(color: Colors.white, fontSize: 25),
                ),
              ),
            ),
            SizedBox(
              height: 130,
            ),
            Text('New User? Create Account')
          ],
        ),
      ),
    );
  }
}

Answer 1

您可以通过输入轻松测试这一点

curl -XPOST localhost:8000/users/login

在你的控制台中。

如果两者都在本地运行，“IP”通常是

localhost

而不是

192.168.x.x

。

如果您使用 Android 模拟器，请检查以下文档：

https://developer.android.com/studio/run/emulator-networking#networkaddresses