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url rewriting

 
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what is url rewriting in jsp and servlet?
 
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URL rewriting is useful in retrieving the last user session, when cookies are disabled in the client side. Have a look at this article.
 
anarkali perera
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what are the other ways of session tracking in jsp?
 
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Generally cookies and url rewriting are used for session tracking. Read a tutorial like this to see an example...
 
anarkali perera
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i found this example from site.http://www.roseindia.net/jsp/jspsession/SessionUsingUrlRewriting.shtml

this is encodeURL.jsp


this is EncodeURLProgram.jsp



this is NextPageAfterFirst.jsp
[code]
<html>
<head>
<title>Welcome in In the program of URL rewriting</title>
</head>
<body>
<font size = 6>Hello</font> <%= session.getAttribute("username") %>
</body>
</html>
[code]

my question is is i enter Williams as a name and abcde as password it gives second page.then i click the link it shows the name which i entered.

my problem is if i remove this part "EncodeURLProgram.jsp" from EncodeURLProgram.jsp also it is working .
then what is the url rewriting?
why we add "?name=+name+&password=+password" this part?
 
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