get file modification time
<p>hi all
i want to write a code for monitoring file changes and reacting to changes.
so i write a TimerTask to periodically check the modification of file
but i have a problem:
when file is open by other programs such as excel or word and i'm closing the file
without any changes,value  File.lastModified() is changing.
i am also trying to get modification date by running dir shell script, it's work fine but
it only has minute accuracy!
can any one help me?
thanks</p>
