Update test file on web server

I have a web server that I need to update every so often. It's just a text file, and I'd like to be able to do it from a browser.
Each line in the file contains one word. I want to be able to add/delete/modify words(lines).
My questions are:
-Do I need to write a servlet to do this?
-I'm sure I can read the file and display it, but when I want to save it do I erase it and rewrite the whole thing, or is there a way to do an update?
Any suggestions are very appreciated.
Thanks,
James

consider maybe using a JMS and send the log entries as messages. JMS can be set to persists and handles updating from multiple sources (if this applies). something like MQSeries is very robust and reliable. You can of course also use JSD and javaspaces too and save on paying for MQ although the book by Asbury shows how to implement a JMS in pure java.

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