golang post 上传文件
地址：https://github.com/FakerGit/go-tools/tree/master/http
//注意client 本身是连接池，不要每次请求时创建client
var (
HttpClient = &http.Client{
Timeout: 3 * time.Second,
}
)
// 上传文件
// url 请求地址
// params post form里数据
// nameField 请求地址上传文件对应field
// fileName 文件名
// file 文件
func UploadFile(url string, params map[string]string, nameField, fileName string, file io.Reader) ([]byte, error) {
body := new(bytes.Buffer)
writer := multipart.NewWriter(body)
formFile, err := writer.CreateFormFile(nameField, fileName)
if err != nil {
return nil, err
}
_, err = io.Copy(formFile, file)
if err != nil {
return nil, err
}
for key, val := range params {
_ = writer.WriteField(key, val)
}
err = writer.Close()
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", url, body)
if err != nil {
return nil, err
}
//req.Header.Set("Content-Type","multipart/form-data")
req.Header.Add("Content-Type", writer.FormDataContentType())
resp, err := HttpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
content, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return content, nil
}
