javascript - 如何设置上传的文件名？

Question

通过使用 'multer' ，我可以像这样请求图像文件。

并且这个文件存储在我设置的“上传”文件夹中。我的代码如下:

var multer  = require('multer')
var upload = multer({dest:'./uploads/'});
//var upload = multer({ storage: storage });
var app = express();
app.use(app.router);
app.post('/upload', upload.single('puzzle'), function (req, res, next) {
    console.log(req.file);
});

但我想将我的文件名设置为“abc.png”而不是“abc”

我阅读了文档，发现了这一点

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, '/uploads');
  },
  filename: function (req, file, cb) {
    cb(null, file.fieldname + '-' + Date.now());
  }
});

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

所以我修改后的代码如下:

var multer  = require('multer')
var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, '/uploads');
  },
  filename: function (req, file, cb) {
    cb(file.filename+'.png', file);
  }
});

var upload = multer({ storage: storage });
var app = express();
app.use(app.router);
app.post('/upload', upload.single('puzzle'), function (req, res, next) {
    console.log(req.file);
});

但在这种情况下，会出现错误并显示 'Error: ENOENT, open '/uploads/puzzle-1449496743377' , not like the picture above...

我该如何解决这个问题？

我敢肯定，许多像我这样的新手开发人员会因为不友善的文档而遇到麻烦......

Answer 1

    var fs = require('fs');
var multer  = require('multer')
//var uploader = multer({dest:'./uploads/'});

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, './uploads/')
  },
  filename: function (req, file, cb) {
    crypto.pseudoRandomBytes(16, function (err, raw) {
      cb(null, raw.toString('hex') + Date.now() + '.png');
    });
  }
});
var upload = multer({ storage: storage });
var app = express();
app.use(app.router);
app.post('/upload', upload.single('puzzle'), function (req, res, next) {
    console.log(req.file);
});

解决了，谢谢大家谢谢