Head First Servlets and JSP, 2nd Edition

The Struts Beer app architecture

Here’s the Beer app architecture, all done up in Struts...

1 Having received a request, the ActionServlet locates the correct form bean using the struts-config.xml file. The ActionServlet invokes the form bean’s validation logic. If the form bean finds any errors, it populates an ActionErrors object.

2 Using the struts-config.xml file, the ActionServlet locates and invokes the Action object, which invokes the model and returns an ActionForward object to the ActionServlet.

3 Having previously extracted the necessary mappings from struts-config.xml, the ActionServlet uses the ActionForward object to dispatch to the correct view component.