Tracking a separate Thread - java/jsp/struts

Question

Hi all,
My project is a webapplication using java/jsp/struts. My requirement is to write bulk data to a file, which i want to run as a separate thread. Since it runs as a separate thread the control comes back to UI (userInterface) page. On subsequent request from UI page by the user i want to check whether the thread process is completed or not , so that i can read from the file. Is it possible to simultaneously read from the file when the thread is in the process of writing data to the file. If so any idea on how to implement this functionality in java?
How to keep track of the separate thread (whether it is completed or not) in java?
Is it possible to read from the file when the thread is writing to the file in java?
Thanks is advance.

Answer 1

dangerous wrote:
How to keep track of the separate thread (whether it is completed or not) in java?Thread#join().
As you're already asking this trival question, I highly recommend you to read the Concurrency Tutorial here at Sun.com. Google can find it.
Is it possible to read from the file when the thread is writing to the file in java?Not with java.io. You can use the java.nio API for that. You can also read/write it in memory (as a byte[] or a ByteArrayInputStream/OutputStream property) and if it is finished then write it to disk.