Validation
1)where sohould we place struts.xml
2)where should we place validation.xml fies
3)Which is the main controller that acts as a servlet:please brief me about the different controller in S2
April 24, 2012 at 12:29 PM
1)Put struts.xml file inside /WEB-INF/classes/
2)Put validation.xml inside /WEB-INF/
3)The controller is implemented by a java servlet, this servlet is centralized point of control for the web application. In struts framework the controller responsibilities are implemented by several different components like
The ActionServlet Class The RequestProcessor Class The Action Class
ActionServlet: Struts ActionServlet handles all the request made by the web browsers to a given mapping. ActionServlet is the central component of the Struts controller. This servlet extends the HttpServlet. This servlet basically performs two important things. First is : When the container gets start, it reads the Struts Configuration files and loads it into memory in the init() method. You will know more about the Struts Configuration files below. Second point is: It intercepts the HTTP request in the doGet() and doPost() method and handles it appropriately.
RequestProcessor:RequestProcessor process the request from the controller. You can sublass the RequestProcessor with your own version and modify how the request is processed. Once the controller receives a client request, it delegates the handling of the request to a helper class. This helper knows how to execute the business operation associated with the requested action.
Action: In the Struts framework,Action class acts as a bridge between a client-side user action and business operation. The Action class decouples the client request from the business model. This decoupling allows for more than one-to-one mapping between the user request and an action. The Action class also can perform other functions such as authorization, logging before invoking business operation. the Struts Action class contains several methods, but most important method is the execute() method.
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