golang+gin 实现文件下载GET接口api

3.service

//TODO Test资源文件下载
func DownloadFileService(c *gin.Context) {
  fileDir := c.Query("fileDir")
  fileName := c.Query("fileName")
  //打开文件
  _, errByOpenFile := os.Open(fileDir + "/" + fileName)
  //非空处理
  if common.IsEmpty(fileDir) || common.IsEmpty(fileName) || errByOpenFile != nil {
      /*c.JSON(http.StatusOK, gin.H{
          "success": false,
          "message": "失败",
          "error":   "资源不存在",
      })*/
      c.Redirect(http.StatusFound, "/404")
      return
  }
  c.Header("Content-Type", "application/octet-stream")
  c.Header("Content-Disposition", "attachment; filename="+fileName)
  c.Header("Content-Transfer-Encoding", "binary")
  c.File(fileDir + "/" + fileName)
  return
}