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Asked: 2026-06-16T04:00:01+00:00

I try to find that in JSP people use several different tags like <%

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I try to find that in JSP people use several different tags like <% %> and<%! %> when add Java code to page, but can anyone tell me what is the main difference between this two tags.

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  1. Editorial Team

    So, there are a number of different jsp scripting elements, each with different usages. These are:

    • <% %>: Scriptlets
      • Evaluates a Java expression. Does not display any result in the HTML produced. Variables declared have only local scope, so cannot be accessed from elsewhere in the .jsp
    • <%! %> : Declarations
      • Allows the declaration of methods or variables, which can then be accessed elsewhere in the .jsp
    • <%@ %>: Directives
      • Specifies page-dependent attributes, such as the scripting language used, or “include” statements
    • <%= %>: Expressions
      • Evaluates a Java expression. Inserts the result (as a string) into the HTML in the .jsp
    • <%-- --%>: Comments
      • JSP comment tags. These will not show up in the page source, unlike HTML comments

    For full documentation, see: http://docs.oracle.com/cd/B14099_19/web.1012/b14014/genlovw.htm

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