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WHAT IS JAVA SERVLETS?

Servlets are Java technology's answer to CGI programming. They are programs that run on a Web server and build Web pages. Building Web pages on the fly is useful (and commonly done) for a number of reasons:

• The Web page is based on data submitted by the user. For example the results pages from search engines are generated this way and programs that process orders for e-commerce sites do this as well.

• The data changes frequently. For example, a weather-report or news headlines page might build the page dynamically, perhaps returning a previously built page if it is still up to date.

• The Web page uses information from corporate databases or other such sources. For example, you would use this for making a Web page at an on-line store that lists current prices and number of items in stock.

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