如何在 node.js 中处理 multipart/form-data
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how to handle multipart/form-data in node.js
提问by R J.
I am uploading image file from client side using multipart form data. I want to receieve and write it as a file in the server side using node.js.
我正在使用多部分表单数据从客户端上传图像文件。我想在服务器端使用 node.js 接收和写入一个文件。
<html>
<body>
<form action="url" method="post" enctype="multipart/form-data">
<input type="text" name="imageName">
<input type="file" name="sam">
</form>
</body>
</html>
This is my client side code. How to handle this file in server side.
这是我的客户端代码。如何在服务器端处理这个文件。
回答by Rajnish
It is repeated question below link.
链接下面有重复的问题。
Uploading images using Node.js, Express, and Mongoose
使用 Node.js、Express 和 Mongoose 上传图片
Here is example:
这是示例：
// Expose modules in ./support for demo purposes
require.paths.unshift(__dirname + '/../../support');
/**
* Module dependencies.
*/
var express = require('../../lib/express')
, form = require('connect-form');
var app = express.createServer(
// connect-form (http://github.com/visionmedia/connect-form)
// middleware uses the formidable middleware to parse urlencoded
// and multipart form data
form({ keepExtensions: true })
);
app.get('/', function(req, res){
res.send('<form method="post" enctype="multipart/form-data">'
+ '<p>Image: <input type="file" name="image" /></p>'
+ '<p><input type="submit" value="Upload" /></p>'
+ '</form>');
});
app.post('/', function(req, res, next){
// connect-form adds the req.form object
// we can (optionally) define onComplete, passing
// the exception (if any) fields parsed, and files parsed
req.form.complete(function(err, fields, files){
if (err) {
next(err);
} else {
console.log('\nuploaded %s to %s'
, files.image.filename
, files.image.path);
res.redirect('back');
}
});
// We can add listeners for several form
// events such as "progress"
req.form.on('progress', function(bytesReceived, bytesExpected){
var percent = (bytesReceived / bytesExpected * 100) | 0;
process.stdout.write('Uploading: %' + percent + '\r');
});
});
app.listen(3000);
console.log('Express app started on port 3000');
If your question is not solve then please visit this link . This is a nice article about file uploading.
如果您的问题没有解决，请访问此链接。这是一篇关于文件上传的好文章。
回答by Gautam
You can use request module for sending a multipart request. Here is the sample code:
您可以使用请求模块发送多部分请求。这是示例代码：
var jsonUpload = { };
var formData = {
'file': fs.createReadStream(fileName),
'jsonUpload': JSON.stringify(jsonUpload)
};
var uploadOptions = {
"url": "https://upload/url",
"method": "POST",
"headers": {
"Authorization": "Bearer " + accessToken
},
"formData": formData
}
var req = request(uploadOptions, function(err, resp, body) {
if (err) {
console.log('Error ', err);
} else {
console.log('upload successful', body)
}
});
