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> ## Scriptlets

> A JSP scriptlet is used to contain any code fragment that is valid for the scripting language used in a page. The syntax for a scriptlet is as follows:

>     <%
>       scripting language statements
>     %>

> When the scripting language is set to `java`, a scriptlet is transformed into a Java programming language statement fragment and is inserted into the service method of the JSP page's servlet. A programming language variable created within a scriptlet is accessible from anywhere within the JSP page.

> In the Web service version of the `hello2` application, `greeting.jsp` contains a scriptlet to retrieve the request parameter named `username` and test whether it is empty. If the `if` statement evaluates to true, the response page is included. Since the `if` statement opens a block, the HTML markup would be followed by a scriptlet that closes the block.

>     <%
>       String username = request.getParameter("username");
>       if ( username != null && username.length() > 0 ) {
>     %>
>       <%@include file="response.jsp" %>
>     <%
>       }
>     %>

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