golang下载阿里云oss图片

func DowOSSImg(imageurl string) (int, error) {

	var(
		fileName string
		filePath string
		filePathName string
		dir string
		urlparse *url.URL

		resp *http.Response
		fileBody  []byte

		outfile *os.File
		err error
	)
	fileName = string([]byte(path.Base(imageurl))[0:strings.LastIndex(path.Base(imageurl), "?")])

	urlparse,err = url.Parse(imageurl)
	if (err != nil) {
		return 0, errors.New("Error:url.Parse"+imageurl)
	}

	if  dir, err = os.Getwd() ;err !=nil{
		return 0, errors.New("Error:oss.Getwd"+err.Error())
	}
	filePathName = dir+urlparse.Path

	filePath = strings.Split(filePathName, fileName)[0]

	_, e := os.Stat(filePath)
	if !os.IsExist(e) {
		if err := os.MkdirAll(filePath, os.ModePerm) ;err !=nil{
			return 0, errors.New("Error:chmod 777" +filePath)
		}
	}
	resp, err = http.Get(imageurl)
	if (err != nil) {
		return 0, errors.New("Error:Current status code:" + strconv.Itoa(resp.StatusCode))
	}
	defer resp.Body.Close()

	fileBody, err = ioutil.ReadAll(resp.Body)
	if (err != nil) {
		return 0, errors.New("Error:ioutil.ReadAll")
	}
	ossXml := ossXml{Code: "none", Message: "none", RequestId: "none", HostId: "none", Key: "none"}
	if  err = xml.Unmarshal([]byte(fileBody), &ossXml) ;err ==nil{
		return 0, errors.New("Error:ioutil.ReadAll Becaues NOT FIND"+imageurl )
	}


	outfile, err = os.Create(filePath+fileName)
	if (err != nil) {
		return 0, errors.New("Error: os.Create:"+err.Error())
	}
	defer outfile.Close()

    return  outfile.Write(fileBody)
}