在node.js中使用multer上载多个文件的服务 [英] Service for uploading multiple file using multer in node.js
问题描述
我创建了一个名为FileUpload的类,并使用multer创建了一个上载多个文件的函数.我想在控制器中使用此方法,但我不能这样做.我无法从请求中获取其他字段. 这是FileUpload类:
I have created class named FileUpload and made one function to upload multiple files using multer.I want to use this method in controller but i cannot to do so. i can not get other fields from request. Here is the FileUpload class :
var multer = require('multer');
class FileUpload{
constructor(){
this.storage = null;
this.filepath = null;
this.upload = null;
}
uploadMultipleFile(req,res,path){
this.filepath = path;
this.storage = multer.diskStorage({
destination : (req,file,callback) =>{
callback(null,path)
},
filename : (req,file,callback)=>{
this.filepath = this.filepath + file.fieldname + '-' + new Date().getTime();
callback(null,this.filepath);
}
});
this.upload = multer({storage:this.storage}).array('files',req.files.length);
this.upload(req,res,(err) => {
if(err){
return res.status(403).send({
success:false,
message : SystemMessage.UploadErrorMessage.replace('{0}',"Files"),
data : {
filepath : filepath
}
});
}
return res.status(200).send({
success:true,
message : SystemMessage.UploadSuccessMessage.replace('{0}',"Files"),
data : {
filepath : filepath
}
});
});
}
}
module.exports = FileUpload;
这是我在其中定义路线的控制器文件:
Here is the controller file in which i have defined route:
const express = require('express');
const router = express.Router();
const FileUpload = require('../services/fileUpload');
router.post("/add",(req,res)=>{
let localdate=CommonFunction.datetime();
let fileUpload = new FileUpload();
let obj = {
user_id:req.body.user_id,
subject:req.body.subject,
message:req.body.message,
created_date:localdate,
modified_date:localdate
};
});
当我从邮递员那里叫这条路线时,我在body.form中使用表格数据格式.我得到了以下响应:
when i call this route from postman,i use form-data format in body.i got following response :
{
user_id: undefined,
subject: undefined,
message: undefined,
created_date: '2019-1-22 13:55:42',
modified_date: '2019-1-22 13:55:42'
}
指导我如何在路由/add中使用uploadMultipleFile函数?
Guide me how can i use uploadMultipleFile function in route /add ?.
推荐答案
定义文件时,可以将multer用作中间件
You can use multer as middleware when you define your file Uploading router like this
在路由器文件中
var multer = require('multer');
var path = require('path');
var storage = multer.diskStorage({
destination: 'public/upload/', // uploading directory
filename: function ( req, file, cb ) { //cahnge file name
let ext = (path.extname(file.originalname)).toLowerCase(); //get file extension
let time = Date.now(); //get timestamp
cb( null, 'vehicle-'+time+ext); //return renamed file
}
});
var upload = multer( { storage: storage } );
router.post('/add',upload.any(), function (req,res){ // any() will accept files that comes over the wire. An array of files will be stored in req.files
uploadMultipleFile(req, res); //or redirect to your controller as you normal do
});
现在转到您的控制器(uploadMultipleFile(req,res))文件.
Now go to your controller (uploadMultipleFile(req, res)) file.
uploadMultipleFile(req, res){
console.log(req.files); //see your files in console
// in req.files files are available do what stuff you want
// you can use loop function to save files details in your database
// you can get single file like this 'your uploaded directory/'+req.file[0].filename;
}
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