Connecter un Backend Spring Boot à un Frontend Flutter

# Configuration Database
spring.datasource.url=jdbc:mysql://localhost:3306/nom_bdd
spring.datasource.username=utilisateur
spring.datasource.password=mot_de_passe

# JPA Configuration
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect

# Server Port
server.port=8080

flutter create flutter_spring_app
cd flutter_spring_app

class Product {
  final int? id;
  final String name;
  final String description;
  final double price;

  Product({this.id, required this.name, required this.description, required this.price});

  factory Product.fromJson(Map json) {
    return Product(
      id: json['id'],
      name: json['name'],
      description: json['description'],
      price: json['price'].toDouble(),
    );
  }

  Map toJson() {
    return {
      'id': id,
      'name': name,
      'description': description,
      'price': price,
    };
  }
}

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

class ApiService {
  static const String baseUrl = "http://10.0.2.2:8080/api"; // Android emulator
  // static const String baseUrl = "http://localhost:8080/api"; // iOS simulator
  // static const String baseUrl = "http://192.168.1.100:8080/api"; // Physical device

  static Future get(String endpoint) async {
    final response = await http.get(Uri.parse('$baseUrl/$endpoint'));
    return _handleResponse(response);
  }

  static Future post(String endpoint, dynamic data) async {
    final response = await http.post(
      Uri.parse('$baseUrl/$endpoint'),
      headers: {'Content-Type': 'application/json'},
      body: json.encode(data),
    );
    return _handleResponse(response);
  }

  static http.Response _handleResponse(http.Response response) {
    if (response.statusCode >= 200 && response.statusCode < 300) {
      return response;
    } else {
      throw Exception('HTTP ${response.statusCode}: ${response.body}');
    }
  }
}

import 'package:flutter/foundation.dart';
import '../models/product.dart';
import '../services/api_service.dart';

class ProductProvider with ChangeNotifier {
  List _products = [];
  bool _isLoading = false;

  List get products => _products;
  bool get isLoading => _isLoading;

  Future loadProducts() async {
    _isLoading = true;
    notifyListeners();
    
    try {
      final response = await ApiService.get('products');
      final List data = json.decode(response.body);
      _products = data.map((json) => Product.fromJson(json)).toList();
    } catch (error) {
      throw Exception('Failed to load products: $error');
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  Future addProduct(Product product) async {
    try {
      await ApiService.post('products', product.toJson());
      await loadProducts(); // Reload the list
    } catch (error) {
      throw Exception('Failed to add product: $error');
    }
  }
}