Download file from X to Y bytes

I have couple of doubts regarding downloading of f开发者_开发百科ile using Java

1. Is it possible to get the size of file before start downloading ?
2. Also is it possible to download only x to y bytes from a file ?

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You can do these provided your server supports these functions. (Its not up to the client) All NFS and CIFS servers do. Some HTTP and FTP servers do. How you do this depends on the protocol and the server you are using.