Servlets vs Portlets

Basic Overview of servlet and portlet-:

S.No	Servlet	Portlets
1	Servlet uses deployment descriptor (web.xml) determine how URLs map to servlets	Portlets also uses web.xml file however they have additional deployment-descriptor portlet.xml, which must declare all of the portlets that will be used by the portlet container
2	Servlet uses HttpServletRequest and HttpServletResponse	Instead of using HttpServletRequest and HttpServletResponse portlets uses Action Request and Action Response , Render Request and Render Response
3	Web Container creates Servlet Context at the time of deploying the project , Servlet Context can be used to get configuration information from web.xml	Similar to servlet context portlet uses PortletContext.
4	Servlet uses ServletConfig to get configuration information	Portlet uses PortletConfig to get configuration information
5	When a request to servlet is made its load the whole html page as view	Portlets generate a small fragement of portal page

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