How to explain struts work flow
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Answer Posted / shiva
1. A request comes in with a .do extension, the container maps it to
the ActionServlet.
2. The ActionServlet acts like a front end controller and dispatches
control to a RequestProcessor.
3. The RequestProcessor finds an action tag with a path attribute that
matches the incoming request
4. Then the RequestProcessor looks for a form-bean tag that has a name
attribute that matched the action tags name attribute.
5. RequestProcessor instantiates a FormBean of the of based on the type
attribute
6. RequestProcessor calls populates the FormBeans fields from the
incoming request, then calls its reset method, then its validate method
7. RequestProcessor instantiates an Action based on the action tags
type attribute
8. RequestProcessor calls the action's execute method which returns
an ActionForward.
9. The RequestProcessor finds a matching ActionForward first within the
nested forward tags, then from within the global-forwards tag.
Note: if the validate method returns an ActionMessage then the
RequestProcessor forward the request to the resource specified in the
action's input attribute
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