使用 multer 和 mongodb 将文件上传到 node-express 站点中的文件夹

Question

我有一个 node-express 应用程序，它使用 multer 验证用户数据和上传文件，当我单击提交时，名称、电子邮件、用户名和密码字段存储在 mongodb 数据库中。但是profileimage文件不存储在uploads文件夹中，也不由monogdb存储。我尝试使用我在网上找到的一些帮助，但都可以使用我的应用程序，但没有将图片存储在文件夹中，mongodb 也没有按照我使用的模型的预期传递 cli 中的 profileimage 字段。请问我在这里没有得到什么，那就是阻止文件上传并存储在所需的文件夹中，并且文件的名称显示在 mongodb cli 中？

注意：与我的应用程序正常工作的其他代码在下面的代码示例中进行了注释，但没有一个将图片存储在所需的文件夹中。

users.js

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


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

/*var storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, './uploads/');
    },
    filename: function (req, file, cb) {
        var originalname = file.originalname;
        var extension = originalname.split(".");
        filename = Date.now() + '.' + extension[extension.length-1];
        cb(null, filename);
    }
}); */

//Require a model page
var User = require('../models/user');
/* GET users listing. */
router.get('/', function(req, res, next) {
  res.send('respond with a resource');
});

router.get('/register', function(req, res, next) {
  res.render('register', {
    'title': 'Register'
  });
});

router.get('/login', function(req, res, next) {
  res.render('login', {
    'title': 'Log In'
  });
 });

//router.post('/register', multer({storage: storage, dest: './uploads/'}).single('profileimage'), function(req,res){
router.post('/register', uploads.single('profileimage'), function(req,res,next){
    //Get Form Value
    var name = req.body.name;
    var email = req.body.email;
    var username = req.body.username;
    var password = req.body.password;
    var password2 = req.body.password2;

    //Check for Image field
    if(req.file){
        console.log('uploading File...');

        // File Info
        var profileImageOriginalName = req.files.profileimage.originalname;
        var profileImageName = req.files.profileimage.name;

        var profileImageMime = req.files.profileimage.mimetype;
        var profileImagePath = req.files.profileimage.path;
        var profileImageExt = req.files.profileimage.extension;
        var profileImageSize = req.files.profileimage.size;
    } else {
        // Set a Default Image
        var profileImageName = 'noimage.png';
    }

    /*if(req.file){
     console.log('uploading File...');

     // File Info
     originalname = req.files.profileimage.originalname;
     feildname = req.files.profileimage.fieldname;

     mimetype = req.files.profileimage.mimetype;
     path = req.files.profileimage.path;
     encoding = req.files.profileimage.encoding;
     size = req.files.profileimage.size;
     } else {
     // Set a Default Image
     var original = 'noimage.png';
     } */

    //Form Validation
    req.checkBody('name', 'Name Field is required').notEmpty();
    req.checkBody('email', 'Email Field is required').notEmpty();
    req.checkBody('email', 'Email not valid').isEmail();
    req.checkBody('username', 'Username Field is required').notEmpty();
    req.checkBody('password', 'Password Field is required').notEmpty();
    req.checkBody('password2', 'Passwords do not match').equals(req.body.password);

    //Check for Errors
    var errors = req.validationErrors();

    if(errors){
        res.render('register',{
            errors: errors,
            name: name,
            email: email,
            username: username,
            password: password,
            password2: password2
        });
    } else {
        var newUser = new User({
            name: name,
            email: email,
            username: username,
            password: password,
            profileImage: profileImageName

    });

        //Create User
        User.createUser(newUser, function (err, user) {
            if(err) throw err;
            console.log(user);
        });

        //Success Message
        req.flash('success', 'You are now registered and may Log in');

        res.location('/');
        res.redirect('/');
    }
});
module.exports = router;

app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var expressValidator = require('express-validator');
var cookieParser = require('cookie-parser');

var session = require('express-session');
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var bodyParser = require('body-parser');
//var multer = require('multer');
var flash = require('connect-flash');
var mongo = require('mongodb');
var mongoose = require('mongoose');
var db = mongoose.connection;
var multer = require('multer');


var routes = require('./routes/index');
var users = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

//Handle File Uploads
var upload = multer({ dest: './uploads' });

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

//Handle Express Sessions
app.use(session({
  secret:'secret',
  saveUninitialized: true,
  resave: true
}));

//Passport
app.use(passport.initialize());
app.use(passport.session());

// Validator
app.use(expressValidator({
  errorFormatter: function(param, msg, value) {
      var namespace = param.split('.')
      , root    = namespace.shift()
      , formParam = root;

    while(namespace.length) {
      formParam += '[' + namespace.shift() + ']';
    }
    return {
      param : formParam,
      msg   : msg,
      value : value
    };
  }
}));

app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(flash());
app.use(function (req, res, next) {
  res.locals.messages = require('express-messages')(req, res);
  next();
});

app.use('/', routes);
app.use('/users', users);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


    module.exports = app;

模型/user.js

var mongoose = require('mongoose');

//This chooses the database to use for storing data a very important step
mongoose.connect('mongodb://localhost/nodeauth');

var db = mongoose.connection;

//User Schema
var UserSchema = mongoose.Schema({
    username: {
        type: String,
        index: true
    },
    password: {
        type: String
    },
    email: {
        type: String
    },
    name: {
        type: String
    },
    profileimaage: {
        type: String
    }
});

var User = module.exports = mongoose.model('User', UserSchema);

module.exports.createUser = function (newUser, callback) {
    newUser.save(callback);
}

Answer 1

在这里，您只是在加载没有在任何地方使用的 multer 模块。

查看完整使用链接：

https://github.com/expressjs/multer

Answer 2

在您的应用中创建 multerhelper.js 文件并在其中添加以下代码

const multer = require('multer');

// const fs = require('fs');
let fs = require('fs-extra');

let storage = multer.diskStorage({
  destination: function (req, file, cb) {
    let Id = req.body.id;
    let path = `tmp/daily_gasoline_report/${Id}`;
    fs.mkdirsSync(path);
    cb(null, path);
},
filename: function (req, file, cb) {
    // console.log(file);

    let extArray = file.mimetype.split("/");
    let extension = extArray[extArray.length - 1];
    cb(null, file.fieldname + '-' + Date.now() + "." + extension);
}
})

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

let createUserImage = upload.single('images');


let multerHelper = {
createUserImage,

}

module.exports = multerHelper;

在你的 user.js 文件中导入这个文件

const multerhelper = require("../multerhelper.js");

router.post('/register',multerhelper  , function(req,res,next){