是否可以上传两个不同的文件（不同的扩展名）到不同的文件夹使用multer+node js。multer(1.3.0)。
我得到一个错误：“意外的字段”
//uploading content code here
router.post('/v1/uploads', function(req, res){
//uploading the cover
//set storage engine for COVER
var storage = multer.diskStorage({
destination : './uploads/covers/',
filename: function(req, file, callback){
callback(null, randomString.generate(10) + "_"+ Date.now() + path.extname(file.originalname));
}
});
//init upload for cover
var upload = multer({
storage: storage,
limits:{fileSize: 50 * 1024 * 1024},
fileFilter: function(req, file, callback) {
checkFileTypeCover(file,callback)
}
}).single('artwork');
upload(req,res, (err) => {
if(err){
res.json({
success: false,
message: 'upload failed cover with an error : '+err
});
}else{
if(req.file == 'undefined'){
res.json({
success: false,
message: 'failed to upload the file on the server for cover'
});
}else{
console.log('we have uploaded an image');
multer = '';
var storage2 = multer2.diskStorage({
destination : './uploads/content/',
filename: function(req, file, callback){
callback(null, randomString.generate(10) + "_"+ Date.now() + path.extname(file.originalname));
}
});
//init upload for cover
var upload2 = multer2({
storage: storage2,
limits:{fileSize: 50 * 1024 * 1024},
fileFilter: function(req, file, callback) {
checkfile(file,callback)
}
}).single('pdf');
//upload image successfully, then upload pdf with new cover name
//uploading the pdf
upload2(req, res, (err) => {
if(err){
res.json({
success: false,
message: 'upload failed pdf with an error : '+err
});
}else{
if(req.file == 'undefined'){
res.json({
success: false,
message: 'failed to upload the file on the server'
});
}else{
console.log('we have uploaded a pdf');
/*
//pdf file url for the content
var pdf_url = req.file.filename;
var title = req.body.title;
var description = req.body.description;
var free = req.body.free;
var content_type = req.body.content_type;
var category = req.body.category;
var publisher = req.body.publisher;
var newzine = new Newzine();
newzine.title = title;
newzine.description = description;
if(free != null){
newzine.free = free;
}
if(content_type !=null){
newzine.content_type = content_type;
}
newzine.category = category;
newzine.publisher = publisher;
newzine.cover_url = 'no_image.png';
newzine.pdf_url = pdf_url;
//save the newzine on the mongo db database
newzine.save(function(err){
if(err){
res.json({
success: false,
message: 'uploaded failed',
error: err
});
}else{
res.json({
success: true,
message: 'file uploaded successful'
});
}
});
}
}
});
}
}
});
}）；
下面我检查图像和封面
var storage = multer.diskStorage({
destination : './uploads/content/',
filename: function(req, file, callback){
callback(null, randomString.generate(10) + "-"+ Date.now()+path.extname(file.originalname));
}
});
var upload = multer({
storage: storage,
limits:{fileSize: 50 * 1024 * 1024},
fileFilter: function(req, file, callback) {
checkFileTypePDF(file,callback)
}
}).single('pdf');
//check file type here for pdf
function checkFileTypePDF(file, callback){
// Allow only PDF extensions
const fileTypes = /pdf|PDF/;
//check extension
const extname = fileTypes.test(path.extname(file.originalname).toLowerCase());
//check mime type
const mimetype = fileTypes.test(file.mimeType);
if(extname){
return callback(null,true);
}else{
callback('only pdf is allowed');
}
}
//check file type here for cover
function checkFileTypeCover(file, callback){
// Allow only Image extensions
const fileTypes = /jpg/;
//check extension
const extname = fileTypes.test(path.extname(file.originalname).toLowerCase());
console.log('the ext name is '+extname);
//check mime type
const mimetype = fileTypes.test(file.mimeType);
console.log('the mimetype is '+mimetype);
if(extname){
return callback(null,true);
}else{
callback('only images are allowed');
}
}
我正在使用邮递员上传图像和pdf，但它在邮递员上失败了，因为它不允许两个文件同时上传。一次只能上传一个文件。
我希望你能上传你的代码。我将在这里发布一个非常通用的方法供您参考。无论如何，multer不介意多次上传或扩展，至少根据它的默认设置。前端代码示例：
<form action="PathOfYourChoice" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="ANY_NAME_YOU_WANT" id="fileToUpload" multiple="">
<input type="submit" value="Upload Image" name="submit">
</form>
使用此表单多次上载任何文件扩展名。注意，您只需要在html标记中有多个attribute（没有必要的值）。
在后端，提供您的存储配置，例如
var storage = multer.diskStorage({//further options to be specified after
discussion
destination: function(req, file, callback) {
callback(null, destination_fileupload(a variable,you should set the
path))
},
filename: function(req, file, callback) {
//filename schema has to be changed.Further decision pending on naming
scheme
callback(null, Date.now()+"-"+file.originalname)
}
});
在后端的路由上，例如
router.post("/PathOfYourChoice",function(req,res){
var upload = multer({
storage: storage
}).array('ANY_NAME_YOU_WANT'); //use .singleif you want only single file
upload . Al
upload(req,res,function(err){
if(err)
throw err;
res.send("files uploaded")
})
需要注意的一件事是.array方法中的字符串必须与您在表单HTML中为输入元素指定的名称相同。在form action属性中指定的路径和路由路径的情况也是一样的。
您可以遵循以下方法：
const storage = multer.diskStorage({
destination: function (req, file, cb) {
let filextPos = file
.originalname
.lastIndexOf('.'),
filext = file
.originalname
.substring(filextPos)
if (filext === 'jpg') {
cb(null, './public/images/jpgs/')
} else {
cb(null, './public/images/pngs/')
}
}
});
const uploader = multer({storage: storage}).single('img');
我们在这里所做的是根据文件（图像）扩展名更改默认的上传路径。
此外,我们使用上载程序中间件,
app.post('/uploadImage', uploader, function(req, res) {
//file uploaded and callback received.
})
