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file comparison

Rashmi Trivedi
Ranch Hand

Joined: Aug 13, 2001
Posts: 60
Hi Guys
I am kind of stuck now..this is what i would my program to do...
I want to compare two different direcotries and compare the files in those direcotries...and write a log saying this is what missing...
in my case there will be a two direcotry A and B
A will have the most latest files and i will be comparing A to other direcotries to check the update...
I am planning to write a servlet...so that my collegue can check things on the web as well...
would you be able to help me guys...
your time is much appreciated...
regards,
Rashmi
Stan James
(instanceof Sidekick)
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Joined: Jan 29, 2003
Posts: 8791
You can use a File object to get a list of files in a directory. You'll probably have a recursive routine that calls itself to deal with subdirectories.
I'd build myself a structure that holds the sorted contents of one directory, maybe a TreeSet of File objects with a Comparator to get them in path plus name order. Create two of these, one for directory A and another for directory B.
Then I'd build something to pull elements from these two sets with a classic sorted set comparison routine:

I'd probably put the result of each trip through this loop into a little object with a flag for A-only, B-only, Both-match, Both-date or size mismatch, and put all of those into yet another structure.
Note - no Servlet stuff here yet. You could use this from a fat Java client and unit test it separately. Finally, pull that collection of result objects into your servlet or JSP page and write out the results.
Any of that help?


A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
Rashmi Trivedi
Ranch Hand

Joined: Aug 13, 2001
Posts: 60
Hi
i must admit that this is not very clear to me...i will try my own things till i have break through...
thank you for your time...i do appreciate it...

regards,
Rashmi
David O'Meara
Rancher

Joined: Mar 06, 2001
Posts: 13459

This is not a Servlet question, I'll move it to Java in General (intermediate) for you.
Dave
 
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subject: file comparison