douping1993
2014-06-09 08:08
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golang-如何从golang服务器在浏览器中下载文件?

My code get file from remote url and download file in browser:

func Index(w http.ResponseWriter, r *http.Request) {
    url := "http://upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png"

    ...

    resp, err := client.Get(url)
    if err != nil {
        fmt.Println(err)
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println(err)
    }

    fmt.Println(len(body))
    //download the file in browser

}

func main() {
    http.HandleFunc("/", Index)
    err := http.ListenAndServe(":8000", nil)

    if err != nil {
        fmt.Println(err)
    }
}

code: http://play.golang.org/p/x-EyR2zFjv

Get file is ok, but how to downloaded it in browser?

Thanks.

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我的代码从远程URL获取文件并在浏览器中下载文件:

   func Index(w http.ResponseWriter,r * http.Request){
 url:=“ http://upload.wikimedia.org/wikipedia/zh/b/bc/Wiki.png"

  ... 
 
 resp,err:= client.Get(url)
 if err!= nil {
 fmt.Println(err)
} 
推迟resp.Body.Close()
 \  n body,err:= ioutil.ReadAll(resp.Body)
如果err!= nil {
 fmt.Println(err)
} 
 
 fmt.Println(len(body))
 // 在浏览器中下载文件
 
} 
 
func main(){
 http.HandleFunc(“ /”,Index)
 err:= http.ListenAndServe(“:8000”,nil)
 
  if err!= nil {
 fmt.Println(err)
} 
} 
   
 
 

code:http://play.golang.org/p/x-EyR2zFjv

获取文件是可以的,但是如何下载

谢谢。

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  • duanqiao1961 2014-06-09 08:36
    已采纳

    To make the browser open the download dialog, add a Content-Disposition and Content-Type headers to the response:

    w.Header().Set("Content-Disposition", "attachment; filename=WHATEVER_YOU_WANT")
    w.Header().Set("Content-Type", r.Header.Get("Content-Type"))
    

    Do this BEFORE sending the content to the client. You might also want to copy the Content-Length header of the response to the client, to show proper progress.

    To stream the response body to the client without fully loading it into memory (for big files this is important) - simply copy the body reader to the response writer:

    io.Copy(w, resp.Body)
    

    io.Copy is a nice little function that take a reader interface and writer interface, reads data from one and writes it to the other. Very useful for this kind of stuff!

    I've modified your code to do this: http://play.golang.org/p/v9IAu2Xu3_

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