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Java Server Pages (JSP) scripting elements and variables"

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JSP scripting elements and variables

The following scripting variables are always available:

out – The JSPWriter used to write the data to the response stream.
page – The servlet itself.
pageContext – A PageContext instance that contains data associated with the whole page. A given HTML page may be passed among multiple JSPs.
request – The HTTP request object.
response – The HTTP response object.
session – The HTTP session object that can be used to track information about a user from one request to another.

There are three basic kinds of scripting elements that allow java code to be inserted directly into the servlet.

A declaration tag places a variable definition inside the body of the java servlet class. Static data members may be defined as well.
<%! int serverInstanceVariable = 1; %>
A scriptlet tag places the contained statements inside the _jspService() method of the java servlet class.
<% int localStackBasedVariable = 1; out.println(localStackBasedVariable); %>
An expression tag places an expression to be evaluated inside the java servlet class. Expressions should not be terminated with a semi-colon.
<%= "expanded inline data " + 1 %>

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