如何从多个文件类型字段中删除multer接受文件？
我有以下代码，使用node.js中的multer上传单个文件：
var storage = multer.diskStorage({
destination: function (req, file, callback) {
callback(null, './public/uploads');
},
filename: function (req, file, callback) {
callback(null, file.fieldname + '-' + Date.now());
}
});
var upload = multer({ storage : storage });
app.post('/rest/upload', upload.array('video', 1), function(req, res, next){
...
}
从下面的表单中，只有视频字段有一个值（如果我同时指定了一个＆＃39; Unexpected字段＆＃39;错误）：
<form action="/rest/upload" method="post" enctype="multipart/form-data">
<label>Video file: </label> <input type="file" name="video"/>
<label>Subtitles file: </label> <input type="file" name="subtitles"/>
<input type="submit"/>
</form>
从文档中不清楚如何处理这个问题？任何建议，将不胜感激。顺便说一句，我尝试了以下参数变化，但没有成功：
app.post('/rest/upload', [upload.array('video', 1), upload.array('subtitles', 1)] ...
app.post('/rest/upload', upload.array('video', 1), upload.array('subtitles', 1), ...
app.post('/rest/upload', upload.array(['video', 'subtitles'], 1), ...
答案 0 :(得分：19)
你想要的是upload.fields()：
app.post('/rest/upload',
upload.fields([{
name: 'video', maxCount: 1
}, {
name: 'subtitles', maxCount: 1
}]), function(req, res, next){
// ...
}
答案 1 :(得分：6)
If you want to upload multiple files/images from the same form, I have used the below code and it works fine. The path of the image is stored in the database; I will skip the database path and go straight to the upload function and how the fields are passed to the save function.
const path = require('path');
const multer = require('multer');
const storage = multer.diskStorage({
destination: (req, file, cb)=>{
if(file.fieldname==="profile")
{
cb(null, './uploads/profiles/')
}
else if(file.fieldname==="natid")
{
cb(null, './uploads/ids/');
}
else if(file.fieldname==="certificate")
{
cb(null, './uploads/certificates/')
}
},
filename:(req,file,cb)=>{
if(file.fieldname==="profile"){
cb(null, file.fieldname+Date.now()+path.extname(file.originalname));
}
else if(file.fieldname==="natid"){
cb(null, file.fieldname+Date.now()+path.extname(file.originalname));
}
else if(file.fieldname==="certificate"){
cb(null, file.fieldname+Date.now()+path.extname(file.originalname));
}
}
});
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 10
},
fileFilter: (req, file, cb) => {
checkFileType(file, cb);
}
}).fields(
[
{
name:'profile',
maxCount:1
},
{
name:'natid', maxCount:1
},
{
name:'certificate', maxCount:1
}
]
);
function checkFileType(file, cb) {
if(file.fieldname==="certificate")
{
if (
file.mimetype === 'application/pdf' ||
file.mimetype === 'application/msword' ||
file.mimetype === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
) { // check file type to be pdf, doc, or docx
cb(null, true);
} else {
cb(null, false); // else fails
}
}
else if(file.fieldname==="natid" || file.fieldname==="profile")
{
if (
file.mimetype === 'image/png' ||
file.mimetype === 'image/jpg' ||
file.mimetype === 'image/jpeg'||
fiel.mimetype==='image/gif'
) { // check file type to be png, jpeg, or jpg
cb(null, true);
} else {
cb(null, false); // else fails
}
}
}
//at the save function
upload(req, res, (err) => {
if (err) {
console.log(err);
} else {
if (req.file == "undefined") {
console.log("No image selected!")
} else {
let datecreated = new Date();
let fullnames = req.body.firstname + ' ' + req.body.lastname;
let formatedphone = '';
let phone = req.body.personalphone;
if (phone.charAt(0) == '0') {
formatedphone = '+254' + phone.substring(1);
} else if ((phone.charAt(0) == '+') && (phone.length > 12 || phone.length <= 15)) {
formatedphone = phone
}
let teachers = {
"teacherid": teacherid,
"schoolcode": req.body.schoolcode,
"fullnames": fullnames,
"email": req.body.email,
"dateofbirth": req.body.dateofbirth,
"nationalid": req.body.nationalid,
"personalphone": formatedphone,
"profile": req.files.profile[0].path,
"natid": req.files.natid[0].path,
"certificate":req.files.certificate[0].path
}
connection.query('INSERT INTO teachers SET ?', teachers, (error, results, fields) => {`enter code here`
if (error) {
res.json({
status: false,
message: 'there are some error with query'
})
console.log(error);
} else {console.log("Saved successfully");
}
答案 2 :(得分：2)
您是否尝试使用multer().any()？
答案 3 :(得分：1)
这对我有用。完整的例子
var multer = require('multer')
var storage = multer.diskStorage({
destination: function(req, file, callback) {
callback(null, './public/audio');
},
filename: function(req, file, callback) {
console.log(file);
if(file.originalname.length>6)
callback(null, file.fieldname + '-' + Date.now() + file.originalname.substr(file.originalname.length-6,file.originalname.length));
else
callback(null, file.fieldname + '-' + Date.now() + file.originalname);
}
});
const upload = multer({ storage: storage });
router.post('/save/audio',upload.fields([{
name: 'audio', maxCount: 1
}, {
name: 'graphic', maxCount: 1
}]) ,(req, res) => {
const audioFile = req.files.audio[0];
const audioGraphic = req.files.graphic[0];
const fileName = req.body.title;
saveAudio(fileName,audioFile.filename,audioGraphic.filename,req.body.artist,function (error,success) {
req.flash('success','File Uploaded Successfully')
res.redirect('/')
});
})
答案 4 :(得分：0)
使用Multer在不同页面上的两个不同格式的字段中上传文件 在此示例中，我有两个字段-简历和图像。以一种形式恢复，以另一种形式恢复图像。两者都在不同的页面上。 首次导入依赖项
const path = require('path'); // for getting file extension
const multer = require('multer'); // for uploading files
const uuidv4 = require('uuidv4'); // for naming files with random characters
定义fileStorage和fileFilter const fileStorage = multer.diskStorage（{ destination：（req，file，cb）=> {//设置文件存储位置
if (file.fieldname === "resume") { // if uploading resume
cb(null, 'resumes');
} else { // else uploading image
cb(null, 'images');
}
},
filename: (req, file, cb) => { // naming file
cb(null, file.fieldname+"-"+uuidv4()+path.extname(file.originalname));
}
});
const fileFilter = (req, file, cb) => {
if (file.fieldname === "resume") { // if uploading resume
if (
file.mimetype === 'application/pdf' ||
file.mimetype === 'application/msword' ||
file.mimetype === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
) { // check file type to be pdf, doc, or docx
cb(null, true);
} else {
cb(null, false); // else fails
}
} else { // else uploading image
if (
file.mimetype === 'image/png' ||
file.mimetype === 'image/jpg' ||
file.mimetype === 'image/jpeg'
) { // check file type to be png, jpeg, or jpg
cb(null, true);
} else {
cb(null, false); // else fails
}
}
};
用于中介的中间件
app.use(
multer(
{
storage: fileStorage,
limits:
{
fileSize:'2mb'
},
fileFilter: fileFilter
}
).fields(
[
{
name: 'resume',
maxCount: 1
},
{
name: 'image',
maxCount: 1
}
]
)
);
然后呼叫您的路线。为了安全起见，您可能需要同时添加csrf保护或身份验证。但这应该可以正常工作。
答案 5 :(得分：-4)
upload(req, res, (err) => {
if (err) {
console.log(err);
} else {
if (req.file == "undefined") {
console.log("No image selected!")
} else {
let datecreated = new Date();
let fullnames = req.body.firstname + ' ' + req.body.lastname;
let formatedphone = '';
let phone = req.body.personalphone;
if (phone.charAt(0) == '0') {
formatedphone = '+254' + phone.substring(1);
} else if ((phone.charAt(0) == '+') && (phone.length > 12 || phone.length <= 15)) {
formatedphone = phone
}
let teachers = {
"teacherid": teacherid,
"schoolcode": req.body.schoolcode,
"fullnames": fullnames,
"email": req.body.email,
"dateofbirth": req.body.dateofbirth,
"nationalid": req.body.nationalid,
"personalphone": formatedphone,
"profile": req.files.profile[0].path,
"natid": req.files.natid[0].path,
"certificate":req.files.certificate[0].path
}
connection.query('INSERT INTO teachers SET ?', teachers, (error, results, fields) => {
if (error) {
res.json({
status: false,
message: 'there are some error with query'
})
console.log(error);
} else {
console.log（“保存成功”）;}