go+gin实现文件预览

r := gin.Default()
//Get路由，动态路由
r.GET("/GetFile/:name", DowFile)

// DowFile 文件在线预览
func DowFile(c *gin.Context){
   //通过动态路由方式获取文件名，以实现下载不同文件的功能
   name:=c.Param("name")
   uploadType := c.Query("type")

   fmt.Println(name)
   var uploadT = ""
   if uploadType =="1" {
      uploadT ="teaching"
   }else {
      uploadT ="professional"
   }
   fmt.Println(uploadType)
   var localPath = "./dataset/"+uploadT+"/"+name
   fmt.Println(localPath)
   err:=minioTest.DownloadObject(uploadT, name, localPath)
   fmt.Println("**************")
   fmt.Println(err)
   if err =="error"{
      c.HTML(http.StatusOK, "error.html", gin.H{
         "title": "error",
      })
   }else{
      c.Header("Content-Type", "application/octet-stream")
      c.Header("Content-Disposition", "attachment; filename="+name)
      c.Header("Content-Transfer-Encoding", "binary")
      //拼接路径,如果没有这一步，则默认在当前路径下寻找
      //filename:=path.Join("./dataset/professional/",name)
      filename:=path.Join("./dataset/"+uploadT+"/",name)
      //响应一个文件
      c.File(filename)
      return
   }

}