英文:
move_uploaded _file equivalent in Go
问题
我正在保存一个以 png 格式的画布图像，并将其发送到我的服务器。我发送的字符串格式如下：
data:image/png;base64,iVBORw0K...
我想将这个图像保存到服务器上名为 "images" 的文件夹中。但是当我寻找示例时，找不到任何相关的内容。基本上，我想做的就是在 PHP 中 move_uploaded_file 函数所做的事情。目前我有以下代码：
type test_struct struct {
Test string `json:"image"`
}
func GetImage(rw http.ResponseWriter, req *http.Request, _ httprouter.Params) {
var img test_struct
json.NewDecoder(req.Body).Decode(&img)
现在，我应该如何将 img.Test（即上述字符串格式）保存到服务器上的文件夹中，以便在打开该文件夹时可以看到图像？
英文:
I am saving an canvas image in png format, and sending it to my server. The string I am sending is in this format...
data:image/png;base64,iVBORw0K...
I want to save this image to a folder called images on my server. But when I look for examples I can't find any. I basically want to do what move_uploaded_file would do in PHP. Right now I have this...
type test_struct struct {
Test string `json:"image"`
}
func GetImage(rw http.ResponseWriter, req *http.Request, _ httprouter.Params) {
var img test_struct
json.NewDecoder(req.Body).Decode(&img)
Now how would I save img.Test, which is the string format above, to a folder in my server so that when I open that folder I can see the image?
答案1
得分: 1
如果你已经有一个使用base64编码的字符串，你需要对其进行解码并获取[]byte数据，最后将其写入文件。
position := strings.Index(img.Test, ",")
if position == -1 {
// 图片格式与"data:image/png;base64,iVBO..."不匹配
}
// 解码base64字符串，从中删除"data:image/png;base64,"
reader := base64.NewDecoder(base64.StdEncoding, bytes.NewBufferString(img.Image[position+1:]))
data, err := ioutil.ReadAll(reader)
if err != nil {
// 错误处理
}
// 将文件写入任何你想要的位置
ioutil.WriteFile("./image.png", data, 0644)
英文:
If you already have a string with the file encoded in base64, you must to decode it and get the []byte data, and finally write a file with it.
position := strings.Index(img.Test, ",")
if position == -1 {
// image format doesn't match with 'data:image/png;base64,iVBO...'
}
// decode the base64 string, removing 'data:image/png;base64,' from it
reader := base64.NewDecoder(base64.StdEncoding, bytes.NewBufferString(img.Image[position+1:]))
data, err := ioutil.ReadAll(reader)
if err != nil {
// error handler
}
// you write the file in wherever you want
ioutil.WriteFile("./image.png", data, 0644)
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