Golang的base64数据转换成图像上飞，并将响应

Question

我有一个示范基地64个数据，可以在IMG标签中使用这样的 -

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/TQBcNTh/AAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg== 
"/> 

Demo

而且我摆弄周围用一个小型的golang程序。 在golang中，我该如何将这个静态基础64位编码数据快速转换为图像，然后将其作为图像发送回应。

防爆 -

http.HandleFunc("/getImage", imageHandler) 

func image(res http.ResponseWriter, req *http.Request) { 
    data := "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/TQBcNTh/AAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg==" 
    // Data is the base64 encoded image 
    dec := b64.NewDecoder(b64.StdEncoding, data) 
    res.Header().Set("Content-Type", "image/png") 
    io.Copy(res, dec) 
} 

Answer 1

在问题的代码是接近。试试这个：

data := "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEX/TQBcNTh/AAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg==" 
// The actual image starts after the "," 
i := strings.Index(data, ",") 
if i < 0 { 
    log.Fatal("no comma") 
} 
// pass reader to NewDecoder 
dec := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data[i+1:]))