JSP scripting elements let you insert Java code into the servlet that will be generated from the current JSP page. There are three forms:
1. Expressions of the form <%= expression %> that are evaluated and inserted into the output,
2. Scriptlets of the form <% code %> that are inserted into the servlet's service method, and
3. Declarations of the form <%! code %> that are inserted into the body of the servlet class, outside of any existing methods.
Each of these is described in more detail below.
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