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JSP 2.0 - New Features

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This article discussed new Features in JSP 2.0

Features of JSP 2.0

        

JSP 2.0  is released with new promises. JSP 2.0 is an upgrade to JSP 1.2 with several new and interesting features. These features makes the life of web application developers and designers easier. 

The JavaServer Pages 2.0 Specification is fully backwards compatible with version 1.2. JSP 2.0 allows the developer to write script-free code without without declarations, scriptlets and expressions.

JSP 2.0 is released with the objective of making the life of Developers easy. Here is the new features of JSP 2.0:

  • Simple Expression Language (EL)
      
  • JSP Fragments
      
  • Simple Tag Handlers
      
  • Easy tags creation with .tag files
     
  • Easy Header and Footer template using the prelude and coda includes
      

With JSP 2.0 web develop has become easily and it also helps easily maintaining dynamic Web pages. Despite the fact the word "Java" appears in JavaServer Pages, with JSP 2.0 the developer can develop pages without learning Java programming language. Learning and using the features of JSP 2.0 is also very easy.

The description of the features is given below:

  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: October 15, 2005

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