如何使用nodejs在服务器上上载文件

Question

我花了几个小时试图将文件上载到本地服务器文件夹upload，但比预期的困难，请帮助。

在我的前端下面插入文件form.hbs

<form action="/editcrew/" method="POST" encType="multipart/form-data" novalidate></form>
<input type="file" name="profile_image">
<button class="btn btn-primary" type="submit" style="margin:90px 0 0 0">Submit</button>
 

下面是我的控制器导出。更新位于文件userController内的。js，它成功地将文件名插入MySql数据库。

exports.update = (req, res) => {
    
    const { first_name, last_name, profile_image } = req.body;

   

    connection.query('UPDATE user SET first_name=? ,last_name=?, profile_image=? ', [first_name, last_name, profile_image, req.params.id], (err, rows) => {
        if (!err) {
            connection.query('SELECT * FROM user WHERE id = ?', [req.params.id], (err, rows) => {
                //when done with the connection release it
                // connection.release();
                if (!err) {
                    res.render('edit-crew', { rows, alert: `${first_name} has been updated.` });
                } else {
                    console.log(err);
                }
                console.log('The data from user table:\n', rows);
            });
        } else {
            console.log(err);
        }
        console.log('The data from user table:\n', rows);
    });
};

下面是用于post请求的路由器。

router.post('/editcrew/:id',userController.update);

const express = require("express");
const exphbs = require("express-handlebars");
const fileUpload = require('express-fileupload');

// const userContoller = require('./controllers/userController')
// to be removed when deployed in heroku

require("dotenv").config();
const cookieParser = require('cookie-parser');



// Parsing middleware
const app = express();

// default option
app.use(fileUpload());

//to load static file
app.use(express.static("public"));
app.use(express.static("upload"));
//Listen on port 5000
app.use(express.urlencoded({ extended: false })); //To parse URL-encoded bodies (as sent by HTML forms)

app.use(express.json()); //To parse the incoming requests with JSON bodies
app.use(cookieParser());

app.engine("hbs", exphbs({ extname: ".hbs" }));//Templating engine to change the extenion of file from .handlebar to .hbs
app.set("view engine", "hbs");


//link which tell to the server express.js to get the routeing from user.js
// const routes = require('./server/routes/user');
app.use("/", require('./routes/user'));
app.use('/auth', require('./routes/auth'));


const port = process.env.PORT || 5000;
app.listen(port, () => console.log(`Listening on port ${port}`));

我的目标是让控制器update不仅在MySql数据库中插入名称文件，而且还将文件上载到本地文件夹/upload




Answer 1

如果您只想将文件上载到服务器并保存文件。我建议您在expressjs中使用“multer”。如果你需要额外的功能，你可以自定义它。您可以阅读文档并开始使用它。这是医生