MongoDB 作为静态文件提供者

MongoDB 作为静态文件提供者的实现方法及案例代码

javascript
const express = require('express');
const mongodb = require('mongodb');
const Grid = require('gridfs-stream');
// 创建 Express 应用
const app = express();
// 连接到 MongoDB
const mongoURI = 'mongodb://localhost/mydb';
const conn = mongodb.createConnection(mongoURI);
// 初始化 GridFS
let gfs;
conn.once('open', () => {
  gfs = Grid(conn.db, mongodb);
  console.log('Connected to MongoDB');
});
// 定义文件下载接口
app.get('/download/:filename', (req, res) => {
  const filename = req.params.filename;
  // 从 MongoDB 中读取文件
  const readstream = gfs.createReadStream({ filename });
  // 将文件流返回给客户端
  readstream.pipe(res);
});
// 监听端口
const port = 3000;
app.listen(port, () => {
  console.log(`Server started on port ${port}`);
});