Developing Custom Portlets
This section provides step-by-step instructions for tasks that developers can or must perform when creating custom portlets. The tasks include the following:
Creating a portlet deployment
portlet.xml). Each portlet
that you deploy must be defined in a portlet deployment
descriptor. A portlet deployment descriptor is an XML
file that provides all of the information that the portal
Web application requires in order to deploy one or more
portlets. The file includes information about the portlet's
initialization, actions, security settings, and resource
Creating display resources
The display resources file contains text strings for the
portlet's title and description for use in the portlet's
metadata. If you create multiple display resources files
for different locales, the portal Web application uses
these files to localize the portlet title and description
at the time of deployment, according to the portal Web
application's default locale.
Developing the presentation
JavaServer Page (JSP) pages. Each portlet must have a JSP
page to serve as the presentation component.
Creating action classes.
You can use the resources of the Portlet Development Kit
to develop the following types of action classes for your
portlets: initializer classes, portlet actions, postprocessing
classes, and error handling classes.
Implementing portlet help. If you want to provide customized
use instructions for a portlet, you can create an action
class with an associated JSP page that contains the help text.
When the user clicks a help button in the portlet's title
bar, the help appears in a pop-up window.
Creating a portlet
archive (PAR) file for deployment in the portal.
To enable automatic deployment of a portlet into the portal
Web application, you must provide a PAR file which contains
all of the needed files. A PAR file can contain files
for one portlet or for multiple related portlets.
For practical applications of these tasks, see Use Cases. For examples of fully developed portlet code, see the Sample Portlets.