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Your first JSP
JSP simply puts Java inside HTML pages. You can take any existing HTML
page and change its extension to ".jsp" instead of ".html". In fact, this
is the perfect exercise for your first JSP.
Take the HTML file you used in the
previous exercise.
Change its extension from ".html" to ".jsp". Now load the new file, with
the ".jsp" extension, in your browser.
You will see the same output, but it will take longer! But only the
first time. If you reload it again, it will load normally.
What is happening behind the scenes is that your JSP is being turned into a
Java file, compiled and loaded. This compilation only happens once, so
after the first load, the file doesn't take long to load anymore. (But
everytime you change the JSP file, it will be re-compiled again.)
Of course, it is not very useful to just write HTML pages with a .jsp
extension! We now proceed to see what makes JSP so useful. |