Goland Gin 将上传的图片文件转存到七牛 CDN

更新日期: 2021-05-28 阅读次数: 5347 字数: 290 分类: golang

安装七牛 golang sdk

go get -u github.com/qiniu/go-sdk/v7
go get github.com/qiniu/go-sdk/v7/storage@v7.9.5

参考七牛官方文档:

https://developer.qiniu.com/kodo/sdk/go

zone 的可选值

参考这里

https://github.com/qiniu/go-sdk/blob/master/storage/zone.go

上传七牛

前端看到的上传格式:

Content-Disposition: form-data; name="file"; filename="some_point.png"
Content-Type: image/png

Golang Gin 的读取操作参考:

https://github.com/gin-gonic/gin#upload-files

示例:

// get file
file, _ := c.FormFile("file")
reader, _ := file.Open()

// qiniu upload
err := formUploader.Put(context.Background(), &ret, upToken, key, reader, file.Size, nil)

题外话,我发现对这些类型概念非常模糊,从网上找了一个非常浅显易懂的解释:

multipart.FileHeader, io.Reader, []byte 的区别

首先 Reader 是什么?

a Reader is any type that implements the Read method.

即实现了 Read 方法的类型,都是 Reader。

If you open a file for reading, the object returned is an os.File, which is a Reader (it implements the Read method):

var r io.Reader
var err error
r, err = os.Open("file.txt")

You can also make a Reader from a normal string using strings.NewReader:

var r io.Reader r = strings.NewReader("Read will return these bytes")

The body data from an http.Request is a Reader:

var r io.Reader
r = request.Body

A bytes.Buffer is a Reader:

var r io.Reader
var buf bytes.Buffer
r = &buf

ioutil.ReadAll

ReadAll 是从 Reader 读取 Byte Array,

b, err := ioutil.ReadAll(r)

io.Copy

从 io.Reader 复制到 io.Writer

n, err := io.Copy(w, r)

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