java how calculate hash of file data without loading file in memory (without read all bytes)

Asked Jan 29 '13 at 20:40

Active Jan 29 '13 at 20:44

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Having this problem, you need to somehow calculate the md5 hash of file content without reading into a byte array because: 1) file can be larger than 2GB 2) do not have enough memory to download a large file.

what can be done? search in Google gave nothing. thanks and sorry for my bad english

asked Jan 29 '13 at 20:40

Vova Shelgunov

6

How could you hash a file's contents without somehow reading the file's contents? Can't you stream the file and calculate a bit at a time? – Dave Newton Jan 29 '13 at 20:41
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You can stream: http://stackoverflow.com/questions/304268 – Tomasz Nurkiewicz Jan 29 '13 at 20:42
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possible duplicate of [Getting a File's MD5 Checksum in Java](http://stackoverflow.com/questions/304268/getting-a-files-md5-checksum-in-java) – Jon Skeet Jan 29 '13 at 20:46
comment by @Bill the Lizard help me, I was thinking the file is loaded into memory. – Vova Shelgunov Jan 29 '13 at 21:19

java how calculate hash of file data without loading file in memory (without read all bytes)

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