Jsp tag libraries based framework for wireless application development
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JSP Tag Libraries based Framework for Wireless Application Development. Hitesh Kr. Seth Chief Technology Evangelist SeraNova, Inc [email protected] O’Reilly Conference on Enterprise Java, 2001. Agenda. Overview Servlets Java Server Pages JSP Tag Libraries

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JSP Tag Libraries based Framework for Wireless Application Development

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JSP Tag Libraries based Framework for Wireless Application Development

Hitesh Kr. Seth

Chief Technology Evangelist

SeraNova, Inc

[email protected]

O’Reilly Conference on Enterprise Java, 2001


Agenda

  • Overview

    • Servlets

    • Java Server Pages

  • JSP Tag Libraries

  • Tag Libraries for Wireless Application Development

    • Design Requirements

    • Tags

  • Enhancements

  • Conclusion

  • References


Servlets


Servlets

  • Java based web server extension mechanism

  • Based on HTTP request-response Paradigm

  • Multi threaded, Session Management

  • Versions

    • J2EE v1.2 – Servlets 2.2

    • J2EE v1.3 - 2.3 (Draft)

  • Usage Scenarios

    • Creating dynamic web applications

    • Finer control than JSP


Features

  • Extend Web Server Functionality

    • Similar to CGI-BIN, NSAPI/ISAPI extensions, apache Modules

  • Portable

    • Multiple Servlet implementations on various platforms

  • Rich

    • Can call any Java API, such as JDBC, EJB, JNDI etc.

  • High Performance

    • Loaded into memory once and called

    • Uses threads for concurrency

    • Can maintain connection pools


Features

  • Converts HTTP Form parameters into a Hashtable

  • Customizable Session Management capabilities

    • Using cookies and URL rewriting

    • Application Servers implement session management Mechanisms

      • Memory, File System, Relational Database; Web farm compatible

  • Leverage other java capabilities such as localization


Servlet by Example


Java Server Pages


JSP

  • Embedded dynamic Java scriptlets

  • Similar to ASP and Server Side JavaScript

  • Implemented as a “Self-Managed” Servlet

    • “Compiled” into Servlets and kept in Memory

  • Separates presentation from business logic

  • Tag Extension mechanism

  • Versions

    • J2EE v1.2 – JSP 1.1

    • J2EE v1.3 – JSP 1.2 (Draft)

  • Usage Scenarios

    • Dynamic/flexible presentation layer


JSP Elements

  • Static Templates

    • HTML/XML/WML/...

  • Standard Directives

    • Include Directive

    • Page Directive

    • Taglib Directive

  • Scripting Elements

    • Declaration

    • Expression

    • Comments

  • Standard Actions

    • forward, get/set Property, include, plugin, useBean, param

  • Custom Tags

    • Tag Libraries


JSP Implicit Objects

  • request

  • response

  • pageContext

  • session

  • application

  • out

  • config

  • page

  • exception

    • Error Pages Only


JSP by Example


HTML Form

(SubmitForm.jsp)

JSP by Example - Interactions


Using Beans

Without Beans

JSP by Example - Beans


Upload HTML

<form method="post" action="Upload.jsp" enctype="multipart/form-data">

<input type="file" name="FILE1" SIZE="50"><br/>

<input type="submit" value="Upload">

</form>

JSP

Using Third Party Beans


JSP/Servlet Implementations

  • Reference Implementation

    • Apache [email protected]

  • Third Party Implementations

    • Allaire JRun Application Server

    • ATG Dynamo Application Server

    • BEA Weblogic Application Server

    • Gemstone/J Application Server

    • IBM WebSphere Application Server

    • iPlanet Application Server

    • Orion Application Server

    • SilverStream Application Server

    • etc.


JSP Tag Libraries


JSP Tag Libraries

  • Create application/vertical specific tags

  • Rich

    • Encapsulation of functionality

    • Simplified Code

    • Less presentation code to manage

  • Easier to author

    • Ease of Use

  • Ease of Use within WYSIWYG authoring tools

    • Portability

    • Reusability

  • Less Java “Scriptlets”

    • Cleaner separation of presentation format & presentation logic


JSP Taglib Examples

  • Examples

    • Logging

      <x:log message=“database #13 connection opened”/>

    • XSLT Transformation

      <xslt:transform stylesheet=“Product.xsl”>xml content

      </xslt:transform>

    • Iteration

      <x:Iterate …/>…</x:Iterate>

    • Send an Email

      <x:email from="[email protected]" [email protected]">Message...

      </x:email>

    • JSR #000052

      • A Standard Tag Library for Java Server Pages


Tag Libraries by Example


Taglib Descriptor


Reusable Tag Libraries

  • Allaire JRun Tag Library

    • Sql, Email, JMS, JNDI, XML Query, XSLT Transformation, Field Validation, Logic - For Each, If, Switch, Case

  • Apache Jakarta Taglibs

    • Application, BSF, DateTime, Input, JNDI, JSP Spec, Page , Regexp, Request, Response, Session, SQL, Utility, XSL

  • BEA Weblogic Portal Tag Library

    • Portal Framework

  • Orion Taglibs

    • EJB/Utility


Tag Libraries for Wireless Application Development


Design Requirements


Requirements Summary

  • Leverage existing HTTP/HTTPS based application delivery frameworks

  • Support multiple display formats

    • HTML, WML, HDML, i-mode (Compact HTML), XHTML-Basic

  • Simple

    • Similar to existing known HTML tags

    • Simple tags and attributes

    • Compliant with Authoring Tools


Multi-modal Page

<page> Tag


Hello World

Tag Library

Multi-modal Page


Web Browser

Wireless Microbrowser

Rendering


Taglib Descriptor


Page Tag Impl.

Browser Detection


Page Tag Impl.(contd.)

WAP/WML Delivery


Page Tag Impl. (contd.)


Page Tag Impl. (contd.)


Hyperlinks

<link> Tag


The Link Tag


HTML Browser

WML Microbrowser

Rendering


Tag Descriptor


Link Tag Impl.


Interactions

<form> and <field> Tags


Form & Fields


HTML Browser

Rendering


WML Microbrowser

Rendering


Tag Descriptor (Field)


Tag Descriptor (Form)


Field Tag Impl.

Call Parent Tag Methods


Form Tag Impl.


Form Tag Impl.

Enumerate all fields


Taglib So far

  • Implemented

    • <page> Tag

    • <link> Tag

    • <form> Tag

    • <field> Tag

  • Common Elements

    • <p>, <br/>, <b>, simplified <table>

  • Basic Simple Constructs for creating an complete multi-modal application


Benefits

  • Similar to HTML tags

    • Ease of authoring/learning

    • Use existing XML Compliant HTML tags

      • <p>, <br/> etc.

  • Simplicity

    • Just <page>, <link>, <form>, <field> tags can be used to create full featured applications

  • Use all JSP features with the application

    • Session Management

    • Request/Response handling

  • Call any Java API


Enhancements

  • Implement other delivery formats

    • HDML, i-Mode, etc.

  • More functionality (more tags/attributes)

  • Use “body” tags

  • Code optimization

  • Use XSLT for “templated” delivery

  • Provide capability to implement device/network specific functionality


Conclusion

  • JSP Tag Libraries

    • Powerful mechanism to implement rich functionality

    • Promotes usability and maintainability

  • Application for a multi-modal Wireless Framework


References


References

  • Servlets

    • Servlets Homepagehttp://www.javasoft.com/products/servlet

    • Java Tutorial (JavaSoft)http://www.javasoft.com/tutorial

    • Servlet Centralhttp://www.servletcentral.com

    • Servlets.comhttp://www.servlets.com

    • Java Servlet Programming (O’Reilly)

    • Java Enterprise in a Nutshell

  • JSP

    • JSP Homepagehttp://www.javasoft.com/products/jsp

    • Professional JSP (Wrox)

    • JSP Resource Indexhttp://www.jspin.com


References

  • Tag Libraries

    • Tag Libraries in JavaServer Pageshttp://java.sun.com/products/jsp/pdf/talks/TagLibs.pdf

    • Jakarta-Taglibs Tutorialhttp://jakarta.apache.org/taglibs/tutorial.html

    • JSR #000052http://java.sun.com/aboutJava/communityprocess/jsr/jsr_052_jsptaglib.html

    • Allaire JRun Tag Libraryhttp://www.allaire.com/handlers/index.cfm?ID=15990&Method=Full

    • Apache Jakarta Taglibshttp://jakarta.apache.org/taglibs

    • BEA Weblogic Portal Tag Libraryhttp://edocs.beasys.com/wlac/portals/docs/tagscontents.html

    • Orion Taglibs (EJB/Utility)http://www.orionserver.com/tags/

    • JSP Tag Libraries at Jspin.comhttp://www.jspin.com/home/tags


References

  • Wireless

    • WAP Forumhttp://www.wapforum.org

    • HDML 3.0 Referencehttp://developer.phone.com/dev/ts/htmldoc/31h/hdmlref/output/


Questions/Suggestions?

?


Thanks for your time


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