JavaServer Pages, 3rd Edition

Implicit Variables

All information about a request and other data can be accessed through the EL implicit variables:

Variable name	Description
pageScope	A collection (a java.util.Map) of all page scope variables.
requestScope	A collection (a java.util.Map) of all request scope variables.
sessionScope	A collection (a java.util.Map) of all session scope variables.
applicationScope	A collection (a java.util.Map) of all application scope variables.
param	A collection (a java.util.Map) of all request parameter values as a single String value per parameter.
paramValues	A collection (a java.util.Map) of all request parameter values as a String array per parameter.
header	A collection (a java.util.Map) of all request header values as a single String value per header.
headerValues	A collection (a java.util.Map) of all request header values as a String array per header.
cookie	A collection (a java.util.Map) of all request cookie values as a single javax.servlet.http.Cookie value per cookie. See Appendix D for a list of properties for the Cookie class.
initParam	A collection (a java.util.Map) of all application initialization parameter values as a single String value per parameter.
pageContext	An instance of the javax.servlet.jsp.PageContext class, providing access to various request data. See Appendix D for a list of its properties.