opensubscriber
   Find in this group all groups
 
Unknown more information…

j : jetspeed-dev@jakarta.apache.org 23 January 2005 • 5:12AM -0500

Re: Portlet & servlet.
by Ken Ramirez

REPLY TO AUTHOR
 
REPLY TO GROUP



>
>
>lureveru@tin.... wrote:
>What are differences between portlet and servlet ?
>  
>
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.

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 similar

Here 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 aren’t 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 portlets’ 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 scope

There are several things that servlets are allowed to do, but portlets
aren’t. These include the following:

    * Portlet aren’t allowed to set the character set encoding of the
      response
    * Portlet also aren’t allowed to set the HTTP headers on the response
    * Portlet cannot manipulate the URL of the client request to the portal

Hope 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://kramirez@TheJ...
Check out the website: http://www.TheJavaThinkTank.org
Check out my Blog at: http://weblogs.java.net/blog/ken_ramirez
*----*----*----*----*----*----*----*----*----*----*----*----


---------------------------------------------------------------------
To unsubscribe, e-mail: jetspeed-dev-unsubscribe@jaka...
For additional commands, e-mail: jetspeed-dev-help@jaka...

Bookmark with:

Delicious   Digg   reddit   Facebook   StumbleUpon

Related Messages

opensubscriber is not affiliated with the authors of this message nor responsible for its content.