Hi all...i started reading servlets and i have a question about deployment descriptor.i didnt undertand the concept of deployment descriptor.Do i need to write deployment descriptor(.xml) for every servlet program i write.somebody help me with this thanks tagore
The deployment descriptor (web.xml file in Tomcat) initializes and maps your Servlets to specific URL patterns. When a request comes in that matches one of the URL patterns you define in the deployment descriptor, the server calls the appropriate Servlet mapped to that URL pattern.
You might see something like this in an HTML form:
The URL pattern is servlet/ProcessFormServlet. Now, in your deployment descriptor, you should define a servlet called ProcessFormServlet. You should map this servlet to the URL pattern servlet/ProcessFormServlet. Realize, there is no actual servlet directory -- this is simply a URL pattern that you define that maps to your servlet.
The deployment descriptor allows you to define and intialize servlets, configure your web app, and a whole lot of other cool stuff too. You might look at investing in a good book. Specifically, if you're using Tomcat, I'd suggest Mastering Tomcat Development by Harrison.
Hi, web.xml is a configuration file which is used to configure our web application. It define all servlets and filters inside a web application, welcome pages, security, etc. Because of that, every web application has to have a web.xml file and it is stored inside folder WEB-INF.