Golang GAE将图片网址保存到Blobstore

问题描述：

I am looking to save an image in Go, something like this:

url := "http://i.imgur.com/m1UIjW1.jpg"

response, e := http.Get(url)
if e != nil {
    log.Fatal(e)
}

defer response.Body.Close()

file, err := os.Create("/tmp/asdf.jpg")
if err != nil {
    log.Fatal(err)
}

_, err = io.Copy(file, response.Body)
if err != nil {
    log.Fatal(err)
}

file.Close()

However - I am using Blobstore on GAE and all of the examples I find seem to be based on some multi-part form upload based on a users browser...

How do I download an image on GAE/Blobstore with a simple GET request:

func handler(w http.ResponseWriter, r *http.Request) {
    urlImage := "http://i.imgur.com/m1UIjW1.jpg"
    //when a user calls this root handle, download urlImage to Blobstore
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

我想在Go中保存图像，例如此： p>

  url：=” http：//  i.imgur.com/m1UIjW1.jpg"

response，e：= http.Get（url）
if e！= nil {
 log.Fatal（e）
} 
 
延迟响应。正文。  Close（）
 
file，err：= os.Create（“ / tmp / asdf.jpg”）
if err！= nil {
 log.Fatal（err）
} 
 
_，err = io  .Copy（file，response.Body）
if err！= nil {
 log.Fatal（err）
} 
 
file.Close（）
  code>  pre> 
 
 但是-我在GAE上使用 Blobstore  我发现的示例似乎基于基于用户浏览器的多部分表单上传  ...  p> 
 
 如何通过简单的GET请求在GAE / Blobstore上下载图像： p> 
 
 
   func handler（w http.ResponseWriter，r * http.Request）{
 urlImage：=“ http://i.imgur.com/m1UIjW1.jpg"
 //当用户调用此根句柄时，将urlImage下载到 Blobstore 
} 
 
func main（）{
 http.HandleFunc（“ /”，handler）
 http.ListenAndServe（“：8080”，nil）
} 
  code>  pre>  
  div>

答

I think, from context, that you mean "upload an image to blobstore" where you say "download an image on blobstore".

Once upon a time you would have created a blobstore Writer with https://cloud.google.com/appengine/docs/go/blobstore/reference#Create , then written on it, and closed it. But as the docs mention this is now deprecated; nowadays, you use instead the package cloud/storage as in the example at https://godoc.org/google.golang.org/cloud/storage#example-NewWriter:

wc := storage.NewWriter(ctx, "bucketname", "filename1")
wc.ContentType = "image/jpg"
wc.ACL = []storage.ACLRule{{storage.AllUsers, storage.RoleReader}}
if _, err := wc.Write(response.Body); err != nil {
    log.Fatal(err)
}

etc, etc -- compared to the example, I've only changed the content type and exactly what bytes you write.

Essentially, blobstore has been replaced by cloud storage, and you should use the latter.

Golang GAE将图片网址保存到Blobstore

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