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Introduction to portlet development
Carla Carrubba ([email protected]) INFN Dpt. Of Catania
Giuseppina Inserra ([email protected]) INFN Dpt. Of Catania
Web course on the development of applications
for Catania Science Gateways, 16 July 2013
Outline
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Introduction
Portlet
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Life cycle
Modes
Files
Integrated Development Enviroment
MyFirst Portlet
Introduction
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What is a portlet?
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Portlet is pluggable user interface software component that is
managed and displayed in a web portal.
Portlet applications, have become a Java standard: the JSR-168
standard defines the Portlet 1.0 specification, and the JSR-286
standard defines the Portlet 2.0 specification.
JSR-168/286 standard portlets should be deployable on any
portlet container.
Introduction
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Where use a portlet?
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In a portlet container. We have chosen the award winning
Liferay portal framework which offers a rich, easy-to- use
"web 2.0" interface using AJAX and other presentation layer
technologies.
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Liferay (www.liferay.com): is a portal framework designed to be
a single web-based environment from which all of a user’s
applications can run, and these applications are integrated
together in a consistent and systematic way.
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Why use a portlet?
Portlets
Portlet
Sc. Gtwy E
Sc. Gtwy D
Sc. Gtwy C
Sc. Gtwy B
Sc. Gtwy A
Introduction
Portlet: Life Cycle
Portlet: Life Cycle
Class GenericPortlets {
init (PortletConfig);
processAction (ActionRequest,
ActionResponse);
render (RenderRequest, RenderResponse);
destroy();
doView (Request, Response);
doEdit (Request, Response);
doHelp (Request, Response);
}
Portlet Modes
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A portlet works in three different states:
View Mode: generates a markup
( a portion of a web page)
Edit Mode: allows portlet customisation
and setting preferences
Help Mode: explains portlet functionalities
Action Request
doView()
Action
Request
Render
Request
doEdit()
view.jsp
view2.jsp
edit.jsp
processAction()
doHelp()
help.jsp
Render request
Render
Request
view.jsp
doView()
view2.jsp
Portlet: Data exchange
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Interaction between jsp pages and java code
Application Server (Glassfish)
JSP page
<jsp:useBean
<form … >
Java code
Class <you portlet>
Extends
GenericPortlet …
<input … />
</form>
• JSP uses <form… statements to send parameters to Java code
• Java code extends class GenericPortlet overriding methods:
Init, doView, doHelp, doEdit, processAction
• Java code uses 2 Classes to exchange data from/to JSPs
Portlet Files (root)
Used by ‘ant’ to compile and
deploy the portlet
Define here JSP’s styles
JSP image files
JavaScript files
Portlet JSP pages
Portlet files(WEB-INF)
Used to define
database and
other resources
settings
Jar Library
directory (local
scope)
Java source
files
Tag library descriptors
for XML file
Portlet
configuration files
Integrated Development Enviroment
Thank you
Question?
MyFirst-Portlet
Hands on!!
Wiki on myFirstPortlet
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Download and Deploy myFirst-portlet
View myFirst-portlet on your Liferay bundle
Customize myFirst-portlet in your personal portlet
Test your personal portlet