用Aliyun oss 的 Multipart upload API 实现的Node.js模块，通过stream的方式上传文件。
官方指定Nodejs模块~
- 使用stream的方式上传文件可以很大程度上降低服务器内存开销。Aliyun官方SDK并没有对stream进行一个完美的封装，所以通常上传文件（Put Object）的流程是客户端上传文件到服务器，服务器把文件数据缓存到内存，等文件全部上传完毕后，一次性上传到Aliyun Oss服务。这样做一旦瞬间上传文件的请求过多，服务器的内存开销会直线上升。而使用stream的方式上传文件的流程是客户端在上传文件数据到服务器的过程中，服务器同时也在把文件数据往Aliyun Oss服务传送，而不需要在服务器上缓存文件数据。
- 可以上传大文件，根据上传数据方式不同而不同, Put Object 方式 文件最大不能超过 5GB，而使用stream的方式，文件大小不能超过 48.8TB
- 更快的速度，由于传统方式（Put Object方式）是客户端上传完毕文件后，统一上传到Aliyun Oss，而stream的方式基本上客户端上传完毕后，服务器已经把一大半的文件数据上传到Aliyun了，所以速度要快很多
- 使用更简单，经过封装后，stream的方式使用起来非常的方便，1分钟就可以学会如何使用
var ALY = require('aliyun-sdk'),
fs = require('fs');
var ossStream = require('aliyun-oss-upload-stream')(new ALY.OSS({
accessKeyId: '在阿里云OSS申请的 accessKeyId',
secretAccessKey: '在阿里云OSS申请的 secretAccessKey',
endpoint: 'http://oss-cn-hangzhou.aliyuncs.com',
apiVersion: '2013-10-15'
}));
var upload = ossStream.upload({
Bucket: 'Bucket',
Key: 'Key (可以理解为文件名)'
});
// 可选配置
upload.minPartSize(1048576); // 1M，表示每块part大小至少大于1M
upload.on('error', function (error) {
console.log('error:', error);
});
upload.on('part', function (part) {
console.log('part:', part);
});
upload.on('uploaded', function (details) {
var s = (new Date() - startTime) / 1000;
console.log('details:', details);
console.log('Completed upload in %d seconds', s);
});
var read = fs.createReadStream('./photo.jpg');
read.pipe(upload);
var startTime = new Date();var ALY = require('aliyun-sdk');
var ossStream = require('aliyun-oss-upload-stream')(new ALY.OSS({
accessKeyId: '在阿里云OSS申请的 accessKeyId',
secretAccessKey: '在阿里云OSS申请的 secretAccessKey',
endpoint: 'http://oss-cn-hangzhou.aliyuncs.com',
apiVersion: '2013-10-15'
}));var upload = ossStream.upload({
Bucket: 'Bucket-Name',
Key: 'Key-Name'
});
var read = fs.createReadStream('./photo.jpg');
read.pipe(upload);upload.minPartSize
用于调整每次上传一小块数据的大小，不得低于200KB，默认为200KB，如果经常上传大文件，建议用此方法把值调整大一些
var upload = ossStream.upload({
Bucket: 'Bucket-Name',
Key: 'Key-Name'
});
// 可选配置
upload.minPartSize(1048576); // 1M，表示每块part大小至少大于1M
var read = fs.createReadStream('./photo.jpg');
read.pipe(upload);
error
当上传过程中发生错误，触发error事件，回调函数参数为错误信息
upload.on('error', function (error) {
console.log('error:', error);
});part
上传文件的过程中，会触发part事件，回调函数参数为当前分片的信息
upload.on('part', function (part) {
console.log('part:', part);
});uploaded
上传成功后触发该事件，回调函数参数为完整的 Object
upload.on('uploaded', function (details) {
console.log('details:', details);
});npm i --save aliyun-oss-upload-stream
PS: 如果大家使用过程中，发现什么问题或者需要添加什么功能，及时通知我哈~ 我会及时更新和发布新版本~
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