Question

我正在使用ExpressJS的multer。我想将文件上传限制为0.5 MB。

var limits = { fileSize: 0.5 * 1024 * 1024 };

var upload = multer({ dest: './public/uploads/', limits: limits
 }).single('upl')

 app.post('/',upload, function (req, res) {
  upload(req, res, function (err) {
    if (err) {
            console.log("cs " + err);
      return
    }

           res.end('You new avatar is uploaded')
    // Everything went fine
  })
})

当文件小于0.5 MB时，我可以看到“你上传了新的头像”＃39;但是当它结束时，我明白了，

Error: File too large
   at makeError (C:\Users\Owner\Desktop\nodejs projects\dummy\node_modules\multer\lib\make-error.js:12:13)
   at abortWithCode (C:\Users\Owner\Desktop\nodejs projects\dummy\node_modules\multer\lib\make-middleware.js:77:22)
   at FileStream.<anonymous> (C:\Users\Owner\Desktop\nodejs projects\dummy\node_modules\multer\lib\make-middleware.js:139:11)
   at emitNone (events.js:80:13)
   at FileStream.emit (events.js:179:7)
   at PartStream.onData (C:\Users\Owner\Desktop\nodejs projects\dummy\node_modules\busboy\lib\types\multipart.js:220:18)
   at emitOne (events.js:90:13)
   at PartStream.emit (events.js:182:7)
   at readableAddChunk (_stream_readable.js:153:18)
   at PartStream.Readable.push (_stream_readable.js:111:10)

显然，我绝不希望最终用户看到这一点。我该如何妥善处理？

Answer 1

尝试像这样重写（删除＆＃34;上传＆＃34;首先）：

app.post('/', function (req, res) {
  upload(req, res, function (err) {
    if (err) {
        console.log("cs " + err);
      return
    }

    res.end('You new avatar is uploaded')
    // Everything went fine
  })

Answer 2

我已经在server.js文件的末尾创建了Express处理程序。

在所有app.use()之后放置处理程序函数，请检查来自multer的错误，然后发送所需的数据。我的代码发送了LIMIT_FILE_SIZE字符串。

app.use(() => (err: Error, req: Request, res: Response, next: NextFunction) => {
    if (err instanceof multer.MulterError) {
        return res.status(418).send(err.code);
    }
});

文档：http://expressjs.com/en/guide/error-handling.html#error-handling

文件太大错误处理Nodejs Express Multer

2 个答案: