JSP: Setting and accessing variables

A new variable can be declared in JSP with the <c:set&ht; tag. Example:

<c:set var="variable_name" value="value" scope="page|session|request|application">

As the example above indicates, we can select among the four available scopes:

• page
• request
• session
• application

The variable can be printed out with the <c:out> tag. It can be accessed in EL (expression language) with the following syntax:

${pageScope.variable_name}
${requestScope.variable_name}
${sessiomScope.variable_name}
${applicationScope.variable_name}

and from within a scriptlet as follows:

<%= pageContext.getAttribute(variable_name) %>
<%= request.getAttribute(variable_name) %>
<%= session.getAttribute(variable_name) %>
<%= application.getAttribute(variable_name) %>