OKHttp_DownloadFile

（1）用OKHttp实现大文件下载（2）OKHttp实现文件下载的断点续传（3）取消下载时删除已下载的文件 Microstrong Microstrong&&you&&me

Name		Name	Last commit message	Last commit date
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servicebestpractice		servicebestpractice
README.md		README.md

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