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Progress listener to include parsing & validation

Lilian Chase
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I'm currently working on a file upload servlet whereby I use the Apache Commons API and extends the ProgressListener class to monitor the uploading progress.
I've got the basic uploading and progressing monitoring working well.

What I'm trying to accomplish now is to add in validation and parsing functions before writing the files in the server.
Currently, the progress bar shows 100% done but in fact the function is still parsing the file content.

Is there a way for me to include these functions in the progress listener, that is the actual the writing and saving of the file at the server side? Or perhaps a way to set a progress listener to the BufferedWriter?

It is sorta covered in the JavaRanch Style Guide.
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