Expression language: Difference between revisions

Revision as of 13:50, 18 December 2012

Revision as of 13:53, 18 December 2012

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{{Merge|Unified Expression Language|date=October 2009}}

'''Expression Language''' (EL) is a scripting language which allows access to [[Java (Sun)|Java]] components ([[JavaBean]]s) from athrough [[JavaServer Pages|JSP]]. Since [[JavaServer Pages#JSP 2.0|JSP 2.0]], it has been used inside [[JavaServer Pages|JSP]] tags to separate Java code from JSP, and to allow easier access to Java components (than in Java code). [[JavaServer Faces]] also uses EL in a similar role.

Evolution of EL occurred to make scripting easier for web-content designers who have little or practically no knowledge of the core Java Language. This scripting language makes JSP a scripting language in the true sense. Before EL, JSP consisted of some special tags like [[scriptlet]]s, expressions etc. within which Java code was written explicitly. With EL the web-content designer needs only to know how to make proper calls to core Java methods and can enjoy the true scripting flavour of a scripting language.

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* [[OGNL]]- An open source expression language used by [[WebWork]] (and [[Apache Struts|Struts]]2).

* [[MVEL]]- Another open source EL used in many Java-based projects.

* [[Unified Expression Language]]- A successor to EL, also used by [[JavaServer Faces]]

==External links==