JSP中的<％和<％i有什么区别？

Question

Sometimes I see codes come with "i", and sometimes without it. What is the difference between <% %> and <%i %> ?

Answer 1

Looks like there is no such char sequence in JSR-000245 JavaServerTM Pages 2.3 Maintenance Release 2 for Evaluation

Only: Directive elements have a syntax of the form <%@ directive...%> .

There are three language-based types of scripting elements: declarations, scriptlets, and expressions. Declarations follow the syntax <%! ... %>. Script- lets follow the syntax <% ... %> . Expressions follow the syntax <%= ... %> .

Maybe you saw " ! " not " i " character?

Where did you saw it?

Answer 2

I think you mean <%! instead of <%i ?
<%! %> is a JSP declaration and is used to declare variables and methods.

A link that might help: http://docs.oracle.com/javaee/5/tutorial/doc/bnaos.html