// UploadFile 发送文件上传请求
func UploadFile(url string, params map[string]string, nameField, filename string, file io.Reader) ([]byte, error) {
body := new(bytes.Buffer)
writer := multipart.NewWriter(body)
// 在表单中创建一个文件字段
formFile, err := writer.CreateFormFile(nameField, filename)
if err != nil {
return nil, err
}
// 读取文件内容到表单文件字段
_, err = io.Copy(formFile, file)
if err != nil {
return nil, err
}
// 将其他参数写入到表单
for key, val := range params {
_ = writer.WriteField(key, val)
}
if err = writer.Close(); err != nil {
return nil, err
}
// 构造请求对象
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())
// 发送请求
resp, err := HttpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
return ioutil.ReadAll(resp.Body)
}
