Question

尝试在将文件上传到文件夹之前创建一个文件夹。但是，如果我尝试再次下载文件时未更新节点上的服务器，则会出现问题，该文件已添加到已创建的文件夹中。如果我更新服务器，它将创建一个新文件夹并根据需要上载它。请查看代码，我该如何改进？

const db = require('../db');
const fs = require('fs');
const path = require('path');
const uuidv1 = require('uuid/v1');
const multer = require('multer');

console.log(uuidv1())
let storage = multer.diskStorage({
  destination: `./uploads/${uuidv1()}`,
  filename: (req, file, cb) => {
    cb(null, 'test1' + '-' + Date.now() + '.' + path.extname(file.originalname));
  }
});

let upload = multer({storage});

module.exports = (router) => {

  router.get('/get', (req, res) => {
    db.connect.query('SELECT * FROM habalka',
      {type: db.sequelize.QueryTypes.SELECT}
    ).then(result => {
      res.json(result);
    })
  });

  router.post('/post', upload.any(), (req, res) => {
    res.json('test');


  });

  return router;
};

Answer 1

您的问题是启动应用时，它生成新的uuid （一次-在应用启动时）并将其作为字符串传递给{ {1}}方法。

但是您希望每次上传文件时都生成该路径。

这是解决方案：

Multer 具有功能，可以动态生成 目标路径和文件名。

因此，您必须传递一个函数，该函数将生成路径并通过回调返回。

阅读this manual后的示例：

diskStorage

Answer 2

我的最终代码在这里，可以正常工作！谢谢

const db = require('../db');
const fs = require('fs');
const uuidv1 = require('uuid/v1');
const path = require('path');
const multer = require('multer');
const shell = require('shelljs');


console.log(uuidv1())

let storage = multer.diskStorage({

  // pass function that will generate destination path
  destination: (req, file, cb) => {
    // initial upload path
    let destination = path.join(__dirname, '../uploads'); // ./uploads/

    let id = uuidv1();
    shell.mkdir('-p', './uploads/' + id);
    destination = path.join(destination, '', id); // ./uploads/files/generated-uuid-here/
    console.log('dest', destination)

    cb(
      null,
      destination
    );
  },

  // pass function that may generate unique filename if needed
  filename: (req, file, cb) => {
    cb(
      null,
      Date.now() + '.' + path.extname(file.originalname)
    );
  }

});

var upload = multer({storage: storage})

module.exports = (router) => {

  router.get('/get', (req, res) => {
    db.connect.query('SELECT * FROM habalka',
      {type: db.sequelize.QueryTypes.SELECT}
    ).then(result => {
      res.json(result);
    })
  });

  router.post('/post', upload.any(), (req, res) => {
    res.json('test');


  });

  return router;
};

文件上传之前生成目标路径-multer

2 个答案: