beego文件上传的例子

func (c *Controller) Upload() {
    file, _, err := c.GetFile("file") // 获取上传的文件
    if err != nil {
        c.Ctx.WriteString("Failed to get file")
        return
    }
    defer file.Close()
    // 保存文件到服务器
    fileLocation := "/path/to/your/upload/dir/" + file.Filename
    err = c.SaveToFile("file", fileLocation)
    if err != nil {
        c.Ctx.WriteString("Failed to save file")
        return
    }
    c.Ctx.WriteString("File uploaded successfully")
}

beego下载文件

func (c *Controller) Download() {
    fileName := c.GetString("filename") // 获取要下载的文件名
    fileLocation := "/path/to/your/upload/dir/" + fileName
    // 将文件作为响应返回给客户端
    c.Ctx.Output.Download(fileLocation, fileName)
}

详情教程请参考：beego文件上传和下载教程