Question

我使用multer上传文件。一切都很好，但fileFilter无法正常工作。我不知道我哪里出错了。

routes.js

var multer = require('multer');
// Multer diskStorage setting
var storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, './uploads/');
  },
  filFilter: function (req, file, cb) {
    var typeArray = file.mimetype.split('/');
    var fileType = typeArray[1];
    if (fileType == 'jpg' || fileType == 'png') {
      cb(null, true);
    } else {
      cb(null, false)
    }
  },
  filename: function (req, file, callback) {
    callback(null, file.fieldname + '_' + Date.now() + '.jpg');
  }
});

var upload = multer({ storage: storage });
router.post('/add', upload.single('photo'), function(req, res){

    console.log('uploaded');
}

Multer还会上传非允许的文件。有什么想法吗？

Answer 1

  const multer = require('multer');
  const storage = multer.diskStorage({
  destination: function (req, file, callback) {
  callback(null, './uploads/');
  },
  fileFilter: function(req,file, cb){
  const extension = path.extname(file.originalname).toLowerCase()
  const mimetyp = file.mimetype 
  if(extension !== '.jpg' || extension !== '.jpeg' || extension !== '.png' || mimetyp 
  !== 
  'image/png' || mimetyp !== 'image/jpg' || mimetyp !== 'image/jpeg' ){
     cb('error message', true)
  } 


  },
  filename: function (req, file, callback) {
  callback(null, file.fieldname + '_' + Date.now() + '.jpg');
  }
  });

  const upload = multer({ storage: storage });
  router.post('/add', upload.single('photo'), function(req, res){

 console.log('uploaded'); 
 }

我认为这会有所帮助

Answer 2

你的fileFilter上有一个拼写错误;你已经将它命名为filFilter。您能否将代码更改为以下内容并告诉我们它是否成功了？

var multer = require('multer');
// Multer diskStorage setting
var storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, './uploads/');
  },
  fileFilter: function (req, file, cb) {
    var typeArray = file.mimetype.split('/');
    var fileType = typeArray[1];
    if (fileType == 'jpg' || fileType == 'png') {
      cb(null, true);
    } else {
      cb(null, false)
    }
  },
  filename: function (req, file, callback) {
    callback(null, file.fieldname + '_' + Date.now() + '.jpg');
  }
});

var upload = multer({ storage: storage });
router.post('/add', upload.single('photo'), function(req, res){

    console.log('uploaded');
}

Answer 3

fileFilter必须在multer的options object中定义，而不是在diskStorage中定义

const uploadFilter = function(req, file, cb) {
    // filter rules here
}

const upload = multer({
    storage: storage,
    fileFilter: uploadFilter,
});

Multer：fileFilter无法正常工作

3 个答案: