기본 초기세팅 작업

lib/main.dart

@@ -1,5 +1,58 @@
+import 'dart:convert';
 import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
 
 void main() {
-  runApp(const MaterialApp());
+    runApp(const App());
+}
+
+class App extends StatelessWidget {
+    const App({super.key});
+
+    Future<bool> checkApiConnection() async {
+        final res = await http.get(
+            Uri.parse('http://localhost:5000/db'),
+        );
+
+        final Map<String, dynamic> data = jsonDecode(res.body);
+        return data['value'] == 777;
+    }
+
+    @override
+    Widget build(BuildContext context) {
+        return MaterialApp(
+            home: Scaffold(
+                body: Center(
+                    child: FutureBuilder<bool>(
+                        future: checkApiConnection(),
+                        builder: (context, snapshot) {
+                            if (snapshot.connectionState == ConnectionState.waiting) {
+                                return const CircularProgressIndicator();
+                            }
+                            if (snapshot.hasError) {
+                                return const Text(
+                                    'API SERVER CONNECTION FAILED',
+                                    style: TextStyle(
+                                        fontSize: 20,
+                                        fontWeight: FontWeight.bold,
+                                        color: Colors.red,
+                                    ),
+                                );
+                            }
+
+                            return const Text(
+                                'API SERVER CONNECTED',
+                                style: TextStyle(
+                                    fontSize: 22,
+                                    fontWeight: FontWeight.bold,
+                                    color: Colors.green,
+                                    letterSpacing: 1.2,
+                                ),
+                            );
+                        },
+                    ),
+                ),
+            ),
+        );
+    }
 }