file

type Downloader struct {
	FileSize     int
	Link         string
	FilePath     string
	TotalPart    int //下载线程
	DoneFilePart []Part
	PartSize     int
}

type Part struct {
	Index    int    //文件分片的序号
	From     int    //开始byte
	To       int    //解决byte
	Data     []byte //http下载得到的文件内容
	FilePath string //下载到本地的分片文件路径
}

type Uploader struct {
	Url      string
	FilePath string
}