Let's talk about how node+multiparty implements file uploading

How to upload files using node? The following article will introduce to you how to upload files using node combined with multiparty. I hope it will be helpful to you!

File uploading is probably an essential operation in every project. Today we use nodejs to implement a file upload module.

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1.Module

npm i multiparty

npm i express

2.Code

We put the code in the (upload.js) file. The code in the file is as follows:

// 上传文件模块
const multiparty = require('multiparty')
// 文件操作模块
const fs = require('fs')
// 导入express框架
const express = require('express')
// 路由
const router = express.Router()
// 上传文件接口
router.post('/upload/file', (req, res) => {
    /* 生成multiparty对象，并配置上传目标路径 */
    let form = new multiparty.Form();
    // 设置编码
    form.encoding = 'utf-8';
    // 设置文件存储路径，以当前编辑的文件为相对路径
    form.uploadDir = './public';
    // parse，表单解析器
    // fields :普通的表单数据
    // files:上传的文件的信息
    form.parse(req, function (err, fields, files) {
        try {
            // 文件为files.file[0]
            let upfile = files.file[0]
            // 为文件进行命名,修改upfile文件中的path,否则会随机生成文件名
            let newpath = form.uploadDir + '/' + upfile.originalFilename  //文件名
            // 重命名
            fs.renameSync(upfile.path, newpath);
            // 返回信息,((upfile.size)/1048576).toFixed(2)将文件由B转换为M的单位并进行取小数点后两位进行四舍五入向上取操作
            res.send({
                code:200,
                msg:'File Success',
                file_name:upfile.originalFilename,
                file_size:((upfile.size)/1048576).toFixed(2)+'M'
            })
        } catch {
            //    异常情况下的消息
            console.log(err)
            res.send({
                code:401,
                msg:'File error',
                more_msg:err
            })
        }
    })
})
// 导出该模块供main主函数文件中进行调用
module.exports = router

##3.main .js file

// 引入express模块
const express = require('express')
// 实例化express
const app = express()
// 文件夹映射
app.use('/static',express.static('public'))
// 上传文件接口
const upload=require('./router/upload')
app.use(upload)
// 监听服务
app.listen('3333', '0.0.0.0', (res) => {
    console.log('Server running http://127.0.0.1:3333')
})

4. Example

Call it done

For more node-related knowledge, please visit:

nodejs tutorial!

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