Essentially, Servlets provide content that normally takes up the whole page in a browser (unless you're using frames), and portlets provide content that is wrapped by a window. With portlets, you can have multiple portlets side by side with one another and each one can provide content and functionality that is different from the other. A portlet can provide the complete interaction for one type of application, while another portlet can provide content for another type of application. The portal can provide some house keeping functionality and secured single point of entries to all of the portlets on a page. As for the particulars (similarities/differences) between them, please continue reading.
[EMAIL PROTECTED] wrote:
What are differences between portlet and servlet ?
Here are some similarities:
* Servlets and portlets are web based components that utilize Java
for their implementation
* Portlets are managed by a portlet container similar to a servlet
container
* Both of these components generate content, which can be static or
dynamic
* Both portlets and servlets have a lifecycle that is controlled by
the container
* The client/server model is used for both servlets and portlets
* The packaging and deployment are essentially the same
* The manner in which the classes are loaded and the class loaders
that perform the work are also the same
* Lifecycle management is similar
* The Request and Response semantics are also similarHere are some differences:
* Servlets can provide complete web pages, whereas portlets only
provide fragments. These fragments are then aggregated to form a
complete web page by the portal
* Portlets arenât allowed to generated HTML code that contains tags
such as base, body, frame, frameset, head, html, or title. The
iframe tag can be used with caution.
* The user cannot access a portlet directly using a URL in the way
that a servlet is accessed. Instead, the URL points to the page
containing all of the portlets on one page
* Communication between the web client and the portlets is performed
through the portal
* Portlets can be provided with buttons or controls to manipulate
the portletsâ window states or portlet modes
* Multiple instances of a single portlet can be placed onto the same
page
* Portlets support persistent configuration and customization
* Portlets also support user profile information
* Portlets support two scopes within the session; application scope
and portlet scopeThere are several things that servlets are allowed to do, but portlets arenât. These include the following:
* Portlet arenât allowed to set the character set encoding of the
response
* Portlet also arenât allowed to set the HTTP headers on the response
* Portlet cannot manipulate the URL of the client request to the portalHope that helps :-)
*----*----*----*----*----*----*----*----*----*----*----*---- Stay on top of all things regarding JSR-168 Portlet and Portal development by bookmarking the authority on the subject: http://community.java.net/portlet * * News * Weblogs * Community Tips * Portlet and Portal Projects * Featured Articles * And much more * *----*----*----*----*----*----*----*----*----*----*----*---- Ken Ramirez Send mail to: mailto://[EMAIL PROTECTED] Check out the website: http://www.TheJavaThinkTank.org Check out my Blog at: http://weblogs.java.net/blog/ken_ramirez *----*----*----*----*----*----*----*----*----*----*----*----
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