现在，我很高兴与大家分享我的解决方案

Now, I am very happy with the mood to share my solution

func NewPostFile(url string, paramTexts map[string]interface{}, paramFile FileItem) ([]byte, error) {
// if paramFiles ==nil {
//  return NewPost(url,paramTexts,header,transport)
// }

bodyBuf := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuf)

for k, v := range paramTexts {
    bodyWriter.WriteField(k, v.(string))
}
fileWriter, err := bodyWriter.CreateFormFile(paramFile.Key, paramFile.FileName)
if err != nil {
    fmt.Println(err)
    //fmt.Println("Create form file error: ", error)
    return nil, err
}
fileWriter.Write(paramFile.Content)
contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()
fmt.Println(bodyBuf.String())

resp, err := http.Post(url, contentType, bodyBuf)
if err != nil {
    return nil, err
}
defer resp.Body.Close()
fmt.Println(resp)

if resp.StatusCode < 200 || resp.StatusCode >= 300 {
    b, _ := ioutil.ReadAll(resp.Body)
    return nil, fmt.Errorf("[%d %s]%s", resp.StatusCode, resp.Status, string(b))
}
respData, err := ioutil.ReadAll(resp.Body)
if err != nil {
    return nil, err
}
fmt.Println(string(respData))
return respData, nil

}

type FileItem struct {
Key      string //image_content
FileName string //test.jpg
Content  []byte //[]byte

}