Scriptlets and Expressions in JSP
By: Sathya Narayana in JSP Tutorials on 2010-10-24
Scriptlets enclose Java code (on however many lines) that's evaluated within the generated servlet's _jspService() method to generate dynamic content:
<%
// Java code
%>
Take care when using adjacent scriptlet blocks; this code:
<% if(user.isLoggedIn) { %>
<p>Hi!</p>
<% } %>
<% else { %>
<p>Please log in first...</p>
<% } %>
isn't legal because you've broken the else block into two scriptlets.
Expressions
Expressions return a value from the scripting code as a String to the page:
<p>Hello there,
<%= userName %>
Good to see you.</p>
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