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Features of Jsp 2

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Features of Jsp 2.0

JSP 2.0 is released with new promises. JSP 2.0 is a upgrade version of JSP 1.2 with several new and interesting features. This version is fully compatible with JSP1.2. These features have been added to make the life of web application developers and designers easier. The main objective of the JSP 2.0 is to make JSP easier than ever, it has been made in such a way that it can be learn without the knowledge of Java. After going through this tutorial you will be better understand the features added in JSP 2.0.

The Features in JSP 2.0 are:

  1. Simple Expression Language(EL): Expression Language (EL), provides a way to simplify expressions in JSP. EL provides the ability to use run-time expressions outside JSP scripting elements. Scripting elements are those elements which is used to embed Java code inside the JSP file. Mostly it contains the logic of the program. Scripting elements have three subforms:
    • Declaration: The variables and methods are declared inside declaration. 
    • Scriptlets: The business logic of the program is written inside this. 
    • Expressions: output will be displayed by the expression. 

    Expression Language can be enabled in scriptfree JSP pages:

    1). By using a page directive: We can enable EL by using

    <%@ page isScriptingEnabled="true|false" isEnabled="true|false"%>

    2). By using an element of the deployment descriptor:

    <jsp-config>
      <jsp-property-group>
      <url-pattern>*.jsp</url-pattern>
      <el-enabled>true</el-enabled>
      <scripting-enabled>true</scripting-enabled>
      </jsp-property-group>
      </jsp-config>
     

  2. JSP Fragments: Jsp fragments is a new feature of JSP 2.0 which allows page author to create custom action fragments that can be invoked. The JSP fragments allows a portion of Jsp code to be encapsulated into a Java object that can be passed around and evaluated zero or more times. Methods for creating a JSP fragment:
    1). Providing the body of a <jsp:attribute>: 

    <% attribute name="attributeName" fragment="true">

    2). Providing the body of a tag invocation:
  3. Simple Tag Handlers: 
  4. Easy tags creation with .tag files: With the introduction of JSP 2.0, knowledge of Java is no longer a prerequisite to create a custom tag action. 
  5. Easy Header and Footer template using the prelude and coda includes

 With JSP 2.0 web development has become easy and it also helps in maintaining dynamic web pages easily. To learn JSP 2.0 there is no need to learn java.

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Posted on: April 18, 2011

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