使用中间件 multiparty
安装
npm install multiparty
multiparty.Form
var form = new multiparty.Form(options)
Options:
- encoding - sets encoding for the incoming form fields. Defaults to utf8.
- maxFieldsSize - Limits the amount of memory all fields (not files) can allocate in bytes. If this value is exceeded, an error event is emitted. The default size is 2MB.
- maxFields - Limits the number of fields that will be parsed before emitting an error event. A file counts as a field in this case. Defaults to 1000.
- maxFilesSize - Only relevant when autoFiles is true. Limits the total bytes accepted for all files combined. If this value is exceeded, an error event is emitted. The default is Infinity.
- autoFields - Enables field events and disables part events for fields. This is automatically set to true if you add a field listener.
- autoFiles - Enables file events and disables part events for files. This is automatically set to true if you add a file listener.
- uploadDir - Only relevant when autoFiles is true. The directory for placing file uploads in. You can move them later using fs.rename(). Defaults to os.tmpdir().
使用实例
var multiparty = require('multiparty');
var http = require('http');
var util = require('util');
var fs = require('fs');
console.log(__dirname);
//注意权限问题
var path = __dirname + '/images/';
http.createServer(function(req, res) {
if (req.url === '/upload' && req.method === 'POST') {
//设置编码格式和上传路径。默认上传路径是os.tmpdir()，可以启动node环境输入查看
var form = new multiparty.Form({ encoding: 'utf-8', uploadDir: path });
form.parse(req, function(err, fields, files) {
var filesTmp = JSON.stringify(files, null, 2);
if (err) {
console.log('parse error: ' + err);
} else {
console.log('parse files: ' + filesTmp);
// upload 需要与网页中的input的name属性相同
for (var i in files.upload) {
var inputFile = files.upload[i];
var uploadedPath = inputFile.path;
var dstPath = path+inputFile.originalFilename;
//重命名为真实文件名
fs.rename(uploadedPath, dstPath, function(err) {
if (err) {
console.log('rename error: ' + err);
} else {
console.log('rename ok');
}
});
}
}
res.writeHead(200, { 'content-type': 'text/plain' });
res.write('received upload:\n\n');
res.end(util.inspect({ fields: fields, files: files }));
});
return;
}
// show a file upload form ，注意此处测试时设置utf-8，否则获取的文件名乱码，正常使用一般都是结合expess了
res.writeHead(200, { 'Content-Type': 'text/html;charset=utf-8' });
res.end(
'<form action="/upload" enctype="multipart/form-data" method="post">' +
'<input type="text" name="title"><br>' +
'<input type="file" name="upload" multiple="multiple"><br>' +
'<input type="submit" value="Upload">' +
'</form>'
);
}).listen(3000);