multer回调无法正常工作? [英] multer callbacks not working ?

问题描述

任何人都知道为什么重命名"功能(以及所有其他multer回调)不起作用吗?

Anyone knows why the "rename" function (and all other multer callbacks) are not working?

var express = require('express');
var multer  = require('multer');

var app = express();

app.use(multer({
    dest: 'uploads/',
    rename: function (fieldname, filename) {
        return new Date().getTime();
    },
    onFileUploadStart: function (file) {
        console.log(file.name + ' is starting ...');
    },
    onFileUploadComplete: function (file, req, res) {
        console.log(file.name + ' uploading is ended ...');
        console.log("File name : "+ file.name +"\n"+ "FilePath: "+ file.path)
    },
    onError: function (error, next) {
        console.log("File uploading error: => "+error)
        next(error)
    },
    onFileSizeLimit: function (file) {
        console.log('Failed: ', file.originalname +" in path: "+file.path)
        fs.unlink(path.join(__dirname, '../tmpUploads/') + file.path) // delete the partially written file
    }
}).array('photos', 12));



app.listen(8080,function(){
    console.log("Working on port 8080");
});

app.get('/',function(req,res){
    res.sendFile(__dirname + "/index.html");
});


app.post('/photos/upload', function (req, res, next) {
    // req.files is array of `photos` files
    // req.body will contain the text fields, if there were any
    //console.log(req.files);
    //console.log(req.body);
    res.json(req.files)

});

推荐答案

似乎用法已随着时间而改变.当前，multer构造函数仅接受以下选项( https://www.npmjs.com/package/multer#multer -opts ):

It seems the usage has been changed over time. Currently, multer constructor only accepts following options (https://www.npmjs.com/package/multer#multer-opts):

• dest或storage-文件存储位置
• fileFilter-控制接受哪些文件的功能
• limits-上载数据的限制

• dest or storage - Where to store the files
• fileFilter - Function to control which files are accepted
• limits - Limits of the uploaded data

因此，例如，重命名将通过配置适当的存储来解决( https://www.npmjs.com/package/multer#storage ).

So, for example the renaming is to be solved by configuring appropriate storage (https://www.npmjs.com/package/multer#storage).

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, '/tmp/my-uploads'); // Absolute path. Folder must exist, will not be created for you.
  },
  filename: function (req, file, cb) {
    cb(null, file.fieldname + '-' + Date.now());
  }
})

var upload = multer({ storage: storage });

app.post('/profile', upload.single('fieldname'), function (req, res, next) {
    // req.body contains the text fields 
});

fieldname必须与请求正文中的字段名称匹配.也就是说，在HTML表单发布的情况下，表单上传元素的输入名称.

The fieldname must match the field name in the request body. That is, in case of HTML form post, the form upload element input name.

还可以查看其他中间件功能，例如array和fields- https://www. npmjs.com/package/multer#single-fieldname ，它提供了一些不同的功能.

Also have a look for other middleware functions like array and fields - https://www.npmjs.com/package/multer#single-fieldname which provide a a little different functionality.

您可能还会对限制感兴趣( https://www.npmjs.com/package/multer#limits )和文件过滤器( https://www.npmjs.com/package/multer#filefilter )

Also you may be interested in the limits (https://www.npmjs.com/package/multer#limits) and file filter (https://www.npmjs.com/package/multer#filefilter)

而且-来源是真理的唯一来源-看看吧！( https://github .com/expressjs/multer/blob/master/index.js )

And also - source is the single source of truth - have a peek!(https://github.com/expressjs/multer/blob/master/index.js)

这篇关于multer回调无法正常工作?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！