We can use the validate method of actionform class to check whether the size of uploadded file has exceeded the max size.but,do we really have to upload that file completely before check? if i upload a very large file,maybe several g bytes,then it taks a very long time to transfer that file from client to server.so this realization seems to be not reasonable. I think there must be some way to check the size before the complete transfer,or there must be some way to stop transfer when the tranfered part of file has already exceeded the max size. Thanks a lot for everyone's conern!
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