1. A framework is software designed by the experienced developers using very good architecture/design pattern.
  2. The framework provides a procedure for implementing various features of our application and the framework’s contains the code that is commonly/routinely required in almost all the project.
  3. Struts, spring web, web works etc. frameworks are designed based on MVC architecture.

As part of struts, we get the following things.

  1. A servlet class with the name org.apache.struts.action.ActionServlet.
  2. A set of tag libraries.
  3. A set of classes that are used by the developers in the development of their own classes.

When a struts based application is started, the following steps will be carried out.

  1. WC reads web.xml.
  2. WC creates a servlet object using org.apache.struts.action.ActionServlet class.
  3. WC calls the init () method on ActionServlet object.
  4. The struts code that is part of init () method of ActionServlet reads the information available in struts-config.xml.
  5. Whenever a client sends a request using the URL’s that ends with .do, WC executes the struts code that is part of ActionServlet.

struts_app

Note:

  • org.apache.struts.action.Action is not a servlet class
  • org.apache.struts.action.ActionServlet is a servlet class.