4.29技术中心合并前更改

Co-authored-by: Copilot <copilot@github.com>

pdf-preview-site/backend/server.js

@@ -15,6 +15,8 @@ const JWT_SECRET = 'super-secret-key-pdf-preview';
 app.use(cors());
 app.use(express.json());
 app.use('/uploads/processed', express.static(path.join(__dirname, 'uploads/processed')));
+// Serve the built frontend from the public folder
+app.use(express.static(path.join(__dirname, 'public')));
 
 // Ensure upload directories exist
 const uploadDirOrig = path.join(__dirname, 'uploads/original');
@@ -24,7 +26,8 @@ if (!fs.existsSync(uploadDirProc)) fs.mkdirSync(uploadDirProc, { recursive: true
 
 const storage = multer.diskStorage({
   destination: function (req, file, cb) {
-    cb(null, 'uploads/original/');
+    // 使用绝对路径，避免服务器 CWD 不在项目目录时写入失败
+    cb(null, path.join(__dirname, 'uploads/original/'));
   },
   filename: function (req, file, cb) {
     const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
@@ -79,7 +82,13 @@ app.post('/api/admin/upload', authenticateJWT, upload.single('document'), async
     
     res.json({ message: 'Upload successful', documentId: info.lastInsertRowid });
   } catch (error) {
-    res.status(500).json({ message: 'Error processing PDF', error: error.toString() });
+    // 输出完整堆栈到服务器日志，便于排查
+    console.error('Upload error details:', error.stack || error);
+    res.status(500).json({
+      message: 'Error processing PDF',
+      error: error.message || error.toString(),
+      stack: process.env.NODE_ENV !== 'production' ? error.stack : undefined
+    });
   }
 });
 
@@ -105,7 +114,7 @@ app.get('/api/documents', (req, res) => {
     id: doc.id,
     title: doc.title,
     created_at: doc.created_at,
-    url: `http://localhost:3000/${doc.processed_path}`
+    url: `/${doc.processed_path}`
   }));
   res.json(responseData);
 });
@@ -119,10 +128,22 @@ app.get('/api/documents/:id', (req, res) => {
     id: doc.id,
     title: doc.title,
     created_at: doc.created_at,
-    url: `http://localhost:3000/${doc.processed_path}`
+    url: `/${doc.processed_path}`
   });
 });
 
 app.listen(PORT, () => {
   console.log(`Backend server running on http://localhost:${PORT}`);
 });
+
+// SPA fallback: must be after all API routes so Vue Router can handle client-side routing
+// Note: app.use() (not app.get('*')) is required for Express 5 compatibility
+app.use((req, res) => {
+  const indexPath = path.join(__dirname, 'public', 'index.html');
+  if (fs.existsSync(indexPath)) {
+    res.sendFile(indexPath);
+  } else {
+    res.status(404).send('Frontend not built yet. Run: cd frontend && npm run build');
+  }
+});
+