API Nexus 快速入门指南¶

pip install openai

from openai import OpenAI
client = OpenAI(
    api_key="nxk-你的APIKey",
    base_url="https://apinexus.net/v1",
)
response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "你好"}],
)
print(response.choices[0].message.content)

dependencies:
  flutter:
    sdk: flutter
  http: ^1.2.0
  flutter_dotenv: ^5.1.0

flutter:
  assets:
    - .env

flutter pub get

APINEXUS_API_KEY=nxk-你的APIKey
APINEXUS_BASE_URL=https://apinexus.net/v1

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await dotenv.load(fileName: ".env");
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'API Nexus Demo',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: const ChatHomePage(),
    );
  }
}

class ChatHomePage extends StatefulWidget {
  const ChatHomePage({super.key});

  @override
  State<ChatHomePage> createState() => _ChatHomePageState();
}

class _ChatHomePageState extends State<ChatHomePage> {
  final TextEditingController _input = TextEditingController();
  String _response = '';
  bool _isLoading = false;

  Future<void> _sendMessage() async {
    setState(() => _isLoading = true);
    try {
      final response = await http.post(
        Uri.parse('${dotenv.env['APINEXUS_BASE_URL']!}/chat/completions'),
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer ${dotenv.env['APINEXUS_API_KEY']!}',
        },
        body: json.encode({
          'model': 'gpt-4o-mini',
          'messages': [{'role': 'user', 'content': _input.text}],
        }),
      );
      final data = json.decode(response.body);
      setState(() => _response = data['choices'][0]['message']['content']);
    } catch (e) {
      setState(() => _response = '调用失败: $e');
    } finally {
      setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('API Nexus 快速入门')),
      body: Padding(
        padding: const EdgeInsets.all(16),
        child: Column(
          children: [
            TextField(
              controller: _input,
              decoration: const InputDecoration(hintText: '输入你的问题'),
            ),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: _isLoading ? null : _sendMessage,
              child: Text(_isLoading ? '请求中...' : '发送'),
            ),
            const SizedBox(height: 24),
            Expanded(
              child: Container(
                width: double.infinity,
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: Colors.grey[100],
                  borderRadius: BorderRadius.circular(8),
                ),
                child: SingleChildScrollView(
                  child: Text(_response.isEmpty ? '回复将显示在这里' : _response),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

flutter run -d chrome     # Web 浏览器
flutter run -d linux      # Linux 桌面
flutter run -d macos      # macOS 桌面