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81 lines
2.3 KiB
81 lines
2.3 KiB
const express = require('express');
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const multer = require('multer');
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const cors = require('cors');
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const fs = require('fs');
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const path = require('path');
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const morgan = require('morgan');
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const app = express();
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const port = 3000;
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// Middleware
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app.use(cors({
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origin: 'http://your-frontend-domain.com', // 指定允许的源
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methods: ['GET', 'POST'],
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}));
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app.use(express.json());
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app.use(express.static(path.join(__dirname, 'public'))); // 提供静态文件
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app.use(morgan('combined')); // 记录请求日志
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// 创建上传目录
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const uploadsDir = path.join(__dirname, 'uploads');
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if (!fs.existsSync(uploadsDir)) {
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fs.mkdirSync(uploadsDir, { recursive: true });
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}
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// Multer setup for file uploads
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const storage = multer.diskStorage({
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destination: (req, file, cb) => {
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cb(null, uploadsDir); // 确保上传目录存在
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},
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filename: (req, file, cb) => {
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cb(null, Date.now() + path.extname(file.originalname)); // Append timestamp to avoid name collisions
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}
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});
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const upload = multer({
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storage,
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limits: {
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fileSize: 5 * 1024 * 1024 // 限制文件大小为5MB
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},
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fileFilter: (req, file, cb) => {
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const filetypes = /csv|txt|json/; // 允许的文件类型
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const extname = filetypes.test(path.extname(file.originalname).toLowerCase());
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const mimetype = filetypes.test(file.mimetype);
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if (mimetype && extname) {
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return cb(null, true);
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}
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cb(new Error('Error: File type not supported!'));
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}
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});
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// Endpoint to handle file import
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app.post('/import', upload.single('file'), (req, res) => {
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if (!req.file) {
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return res.status(400).send('No file uploaded.');
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}
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console.log(req.file);
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res.send('File imported successfully!');
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});
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// Endpoint to handle file export
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app.get('/export', (req, res) => {
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const filePath = path.join(__dirname, 'exports', 'sample-data.csv'); // 确保该文件存在
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res.download(filePath, 'sample-data.csv', (err) => {
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if (err) {
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console.error(err);
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res.status(500).send('Error exporting file.');
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}
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});
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});
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// 路由
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app.get('/api/hello', (req, res) => {
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res.send('Hello, world!');
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});
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// 启动服务器
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app.listen(port, () => {
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console.log(`Server running at http://localhost:${port}`);
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}); |