无法在node.js中发布
[英]Cannot post in node.js
问题描述
I want to upload file using node.js , being new to it a tried to check if the file is being send to server. 
我想使用node.js上传文件，这是它的新手，试图检查文件是否正在发送到服务器。 html HTML
<html>
<head>
<title>File Uploading Form</title>
</head>
<body>
<h3>File Upload:</h3>
Select a file to upload: <br />
<form action="img" method="POST"
enctype="multipart/form-data">
<input type="file" name="file" size="50" />
<br />
<input type="submit" value="Upload File" />
</form>
</body>
</html>
js JS
var express = require("express");
var app=express();
var http=require("http").Server(app);
app.get("/",function(req,res){
res.end("hello")
});
app.get("/upload",function(req,res){
res.sendFile(__dirname + "/form.html")
})
app.post("/img",function(req,res){
if(req.files){
console.log(req.files.file.name);
}
else{
console.log("ee")
}
});
http.listen(3000,function(){
console.log("listening on 3000")
})
When i upload something , it throws error 当我上传东西时，它会引发错误
Cannot read files of undefined
Being new to back end i have no idea why its happening , why doesnt the server recieve the file? 作为后端的新手，我不知道为什么会这样，服务器为什么不接收文件？
2 个解决方案
解决方案1
2 已采纳 2016-02-23 20:35:33
You need to app.use() a fileparser. 您需要app.use()一个文件app.use() 。 For example, you could use connect-busboy . 例如，您可以使用connect-busboy 。 You can get more information about options and usage at above link; 您可以在上面的链接中获得有关选项和用法的更多信息。 a simple setup would be somehting like this: 一个简单的设置就是这样：
var busboy = require('connect-busboy');
app.use(busboy());
app.post("/img",function(req,res){
req.busboy.on('file', function (fieldname, file, filename, encoding, mimetype) {
// ...
});
req.busboy.on('field', function (key, value, keyTruncated, valueTruncated) {
// ...
});
req.pipe(req.busboy);
// etc ...
});
解决方案2
0 2016-02-23 21:31:43
As stated in the above answer, you must use a body parser for multipart bodies, but the better solution is to use the express middleware multer which lets you to use req.files just like in your OP. 如以上答案中所述，您必须对多部分主体使用主体解析器，但是更好的解决方案是使用快速中间件multer ，它使您可以像在OP中一样使用req.files 。
Also, multer is built on top of busboy which is the fastest multipart body parser for node.js 此外，multer建立在busboy之上，而busboy是node.js最快的多部分主体解析器
With multer: 与multer：
var express = require('express'),
multer = require("multer"),
app = express();
app.use(multer({
dest: path.resolve(__root + path.sep + config.get("localFolders").rawImages),
limits: {
files: 2
}
}));
// handle file upload
app.post("/img", function (req, res, next) {
var image = req.files.image;
// do something with image;
console.log(image.name);
});
Have a look on the documentation for multer within the link provided above. 在上面提供的链接中查看有关multer的文档。 Good luck. 祝好运。 :) :)
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