feat: 实现成绩管理系统核心功能

添加响应工具、错误处理中间件和数据库模型
创建用户、学生、课程和成绩相关服务
实现管理员、教师和学生控制器的基本功能
重构路由处理并优化数据库查询

backend/server.js

@@ -5,19 +5,21 @@ const MySQLStore = require('express-mysql-session')(session);
 const path = require('path');
 require('dotenv').config();
 
-// 导入路由
+// Config & Utils
+const db = require('./config/database');
+const errorHandler = require('./middleware/errorHandler');
+const { requireAuth, requireRole } = require('./middleware/auth');
+
+// Routes
 const authRoutes = require('./routes/auth');
 const studentRoutes = require('./routes/student');
 const teacherRoutes = require('./routes/teacher');
 const adminRoutes = require('./routes/admin');
 
-// 数据库配置
-const db = require('./config/database');
-
 const app = express();
 const PORT = process.env.PORT || 3000;
 
-// 中间件
+// Middleware
 app.use(cors({
     origin: 'http://localhost:3000',
     credentials: true
@@ -25,9 +27,9 @@ app.use(cors({
 app.use(express.json());
 app.use(express.urlencoded({ extended: true }));
 
-// 会话配置
+// Session
 const sessionStore = new MySQLStore({
-    expiration: 86400000, // 1天
+    expiration: 86400000,
     createDatabaseTable: true,
     schema: {
         tableName: 'sessions',
@@ -52,14 +54,13 @@ app.use(session({
     }
 }));
 
-// 静态文件服务 - 只公开 public 目录
+// Static Files
 app.use('/public', express.static(path.join(__dirname, '../frontend/public')));
 
-// 页面认证中间件
+// View Routes (HTML Serving)
+// 为了简单起见，这里仍然直接 serve HTML，未来可以考虑使用模板引擎或分离前端部署
 const requirePageAuth = (req, res, next) => {
-    if (!req.session.user) {
-        return res.redirect('/login');
-    }
+    if (!req.session.user) return res.redirect('/login');
     next();
 };
 
@@ -73,7 +74,7 @@ const requirePageRole = (allowedRoles) => {
     };
 };
 
-// 页面路由
+// --- Page Routes ---
 app.get('/', (req, res) => res.redirect('/login'));
 app.get('/login', (req, res) => {
     if (req.session.user) return res.redirect('/dashboard');
@@ -91,49 +92,42 @@ app.get('/dashboard', requirePageAuth, (req, res) => {
     }
 });
 
-// 学生页面
+// Student Pages
 app.get('/student/dashboard', requirePageAuth, requirePageRole(['student']), (req, res) => {
     res.sendFile(path.join(__dirname, '../frontend/views/student/dashboard.html'));
 });
 
-// 教师页面
-const teacherRouter = express.Router();
-teacherRouter.use(requirePageAuth, requirePageRole(['teacher']));
-teacherRouter.get('/dashboard', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/teacher/dashboard.html')));
-teacherRouter.get('/grade_entry', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/teacher/grade_entry.html')));
-teacherRouter.get('/grade_management', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/teacher/grade_management.html')));
-app.use('/teacher', teacherRouter);
+// Teacher Pages
+const teacherPageRouter = express.Router();
+teacherPageRouter.use(requirePageAuth, requirePageRole(['teacher']));
+teacherPageRouter.get('/dashboard', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/teacher/dashboard.html')));
+teacherPageRouter.get('/grade_entry', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/teacher/grade_entry.html')));
+teacherPageRouter.get('/grade_management', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/teacher/grade_management.html')));
+app.use('/teacher', teacherPageRouter);
 
-// 管理员页面
-const adminRouter = express.Router();
-adminRouter.use(requirePageAuth, requirePageRole(['admin']));
-adminRouter.get('/dashboard', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/admin/dashboard.html')));
-adminRouter.get('/student_management', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/admin/student_management.html')));
-adminRouter.get('/user_management', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/admin/user_management.html')));
-app.use('/admin', adminRouter);
+// Admin Pages
+const adminPageRouter = express.Router();
+adminPageRouter.use(requirePageAuth, requirePageRole(['admin']));
+adminPageRouter.get('/dashboard', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/admin/dashboard.html')));
+adminPageRouter.get('/student_management', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/admin/student_management.html')));
+adminPageRouter.get('/user_management', (req, res) => res.sendFile(path.join(__dirname, '../frontend/views/admin/user_management.html')));
+app.use('/admin', adminPageRouter);
 
-// API 路由
+// --- API Routes ---
 app.use('/api/auth', authRoutes);
 app.use('/api/student', studentRoutes);
 app.use('/api/teacher', teacherRoutes);
 app.use('/api/admin', adminRoutes);
 
-// 404处理
+// Error Handler
 app.use((req, res) => {
-    res.status(404).json({ error: 'Not found' });
-});
-
-// 错误处理
-app.use((err, req, res, next) => {
-    console.error(err.stack);
-    res.status(500).json({ error: 'Internal server error' });
+    res.status(404).json({ success: false, message: 'Not Found' });
 });
+app.use(errorHandler);
 
+// Start Server
 app.listen(PORT, async () => {
     console.log(`Server running on port ${PORT}`);
     console.log(`访问地址: http://localhost:${PORT}`);
-    
-    // 测试数据库连接
-    const dbConfig = require('./config/database');
-    await dbConfig.testConnection();
+    await db.testConnection();
 });