Golang将base64数据转换为动态图像并发送响应

Question

我有一个64位数据样本,可以在这样的img标签中使用 -

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

演示

我正在摆弄一个小的golang计划.在golang中,如何将这个静态基本64位编码数据动态转换为图像,然后将其作为响应时的图像发送.

前 -

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

问题中的代码很接近.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:]))