使用express/multer时更改文件名

Question

我在上传 pdf 时遇到问题，当我上传它时（我正在使用

ng-file-upload

），到达express.js 的文件 json 是：

{ fieldname: 'file',
  originalname: 'db.pdf',
  encoding: '7bit',
  mimetype: 'application/pdf',
  destination: './client/public/docs/transactions/',
  filename: '8a3fe7cb7369d9cffa8e17b162ec3d6b',
  path: 'client\\public\\docs\\transactions\\8a3fe7cb7369d9cffa8e17b162ec3d6b',
  size: 9179145 }

我想将名称更改为我从 Angular 发送到 Express 的属性，这是所有设置：

html 元素：

<div ngf-select="vm.uploadPdf($file, $errFiles)"
     ngf-pattern="'.pdf'"
     accept="application/pdf" ngf-max-size="20MB">Select ...
</div>

角度函数

uploadPdf

（ctrl作为vm）：

function uploadPdf( file, errFiles ) {
    vm.pdf = file;
    vm.errorFile = errFiles && errFiles[ 0 ];

    if ( vm.pdf ) {
        Upload
            .upload( {
                url: '/upload',
                data: {
                    file: vm.pdf,
                    new_file_name: vm.new_name//this is the filename I want
                }
            } )
            .then(
                function ( response ) {
                    $timeout( function () {
                        vm.pdf.result = response.data;
                    } );
                }, function ( response ) {
                    if ( response.status > 0 ) {
                        vm.errorQuedanPdfUpload = response.status + ': ' + response.data;
                        console.log( vm.errorQuedanPdfUpload );
                    }
                }
            );
    }
}

表达：

var express = require( 'express' ),
    router  = express.Router(),
    util    = require( 'util' ),
    multer  = require( 'multer' );

var storage = multer.diskStorage(
    {
        destination: './uploads/',
        filename: function ( req, file, cb ) {
            //req.body is empty...
            //How could I get the new_file_name property sent from client here?
            cb( null, file.originalname );
        }
    }
);

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

router.route( '/upload' )
    .post( upload.single( 'file' ), post );

function post( request, response ) {

    response.json( { message: 'Files Uploaded!' } );

}

Answer 1

var express = require( 'express' ),
    router  = express.Router(),
    util    = require( 'util' ),
    multer  = require( 'multer' );

var storage = multer.diskStorage(
    {
        destination: './uploads/',
        filename: function ( req, file, cb ) {
            //req.body is empty...
            //How could I get the new_file_name property sent from client here?
            cb( null, file.originalname+ '-' + Date.now()+".pdf");
        }
    }
);

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

router.route( '/upload' )
    .post( upload.single( 'file' ), post );

function post( request, response ) {

    response.json( { message: 'Files Uploaded!' } );

}

Answer 2

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

      cb(null,  file.originalname );

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

在你的express中这样配置

Answer 3

在 Angular 中，您需要将 new_file_name 移动到 data 中的 file 上方，如下所示：

    Upload
        .upload( {
            url: '/upload',
            data: {
                new_file_name: vm.new_name, //this is the filename I want
                file: vm.pdf
            }
        } )

基本上浏览器需要在文件之前发送该数据......可以在这里找到更好的解释：https://github.com/expressjs/multer/issues/134

Answer 4

这就是我的上传配置的样子：

const storage = multer.diskStorage({
    destination: (req, file, callBack) => {
        callBack(null, "your_upload_path");
    },
});
const upload = multer({ storage });

这就是我在服务器上发帖的方式：

server.post(
    "/add/own-ship",
    upload({
        fileName: (req, file) => {
            return `${req.body.your_desired_field_name}_${file.originalname}`;
        },
    }).single("your_file_key_name"),
    async (req, res) => {
        try {
            // your code
        } catch (err) {
            res.status(500).send(err);
        }
    }
);