Search files for specific lines of data

Hi all, I have a problem that I hope someone can help me with.
I need to find a way to search for specific lines of data on a file.
Here's the setup.... say for example I have 10 files, each filled with log files containing data like the date they were created and also certain information they were monitoring.
From a Java applet, a user types in information that they want (for example, only lines that were created between 2002/04/04 and 2002/05/05 and only ones tagged with "Caution"). I need a way to grab all of those line from each of the files, without having to open each file, read each line and check for each search request. Instead, I want to simply grab all of the data at once, or at the very least, grab all of the data from the first file, then grab all of the data from the second file etc, without having to search each individual line. (the reason I'm hoping for a command like this is because there will eventually be thousands of files that need to be searched, and opening each one, and then search each line one by one would take too long.
Sort of like a grep command in Linux. Does Java have a similar command?
Any information or samples would be greatly appreciated!

I don't know how much control you have over the files that you have to search.
Searching XML files would be a lot easier because XPATH queries will work exactly like SQL... The only problem being if your files are not XML at all.
If you have control over the format of these files you are trying to search, then try XML... else you might have to write a batch utility that runs every N seconds and converts data in these files to XML format files conforming to a specific format and then your applet could query the XML files.
There will be a small concurrency issue there, though; As there will be at least some time consumed by the thread.

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