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Please help me to understand this snipped of code ?

 
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please refer the URL at http://www.javaworld.com/javaworld/jw-02-2009/jw-02-servlet3.html?page=2

following is code listing from above mentioned URL



can somebody just explain this code. not be line by line just the important parts. i shall be very grateful
Regards
 
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What is it that you don't understand from the article from which this code comes from? You surely don't expect anyone to start from scratch when that article already exists?
 
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