MVC without Struts: A doubt

[Yash Sharma]

I have been busy dealing with a MVC framework of my own. I have defined an abstract Action class, based on which I create concrete Action classes (for eg: CreateUserAction).

// Action.java:
public abstract class Action {
  protected Model model;
  public Action(Model model) { this.model = model; }
  public abstract String getName();
  public abstract Object perform(HttpServletRequest req);
};
 
// CreateUserAction.java:
public class CreateUserAction extends Action {
  public CreateUserAction(Model model) {
    super(model);
  }
  public String getName() { return "createUser"; }
  public Object perform(HttpServletRequest req) {
    return model.createUser(req.getAttribute("user"),
                  req.getAttribute("pass"));
  }
}

Model here is some user defined class or bean. I wonder why we need to have a bean to put my business logic in, can't I put it inside my concrete action classes itself. For instance, instead of doing a model.createUser() I could perhaps write the logic in the perform method itself. Does it dilute the MVC model, if I do so?

I had read that writing an if-else contructs to redirect request based on the "action" requested makes ugly code and hence the concept of keeping a map of all action classes and loading them dynamically. But I fail to see how the controller servlet can avoid writing such constructs in order to write code to handle redirects based on responses.

Example, for a simple login authentication:

protected void doPost(HttpServletRequest request, 
HttpServletResponse response)throws ServletException, IOException {  
        
        //Identify operation "op" from URL
        String op = getOperation(request.getServletPath());     
        //Find and execute corresponding Action
        Action action = (Action) actions.get(op);
 
        //Wonder why the result is an object?
        Object result = null;
        try {
            result = action.perform(request);
        } 
        catch (NullPointerException npx) {            
            objLog.fatal("Request for Unknown action: " + op);
        }
        
        if(result.equals("LOGINPASS")){
             //redirect to index page
        }
        else if(result.equals("LOGINFAIL")){
            response.sendRedirect("login.jsp?fail");
        }
        //other else constructs for other actions              
    }

If I have a dozen actions in my application which return result as strings. Assuming that for each database related operation of Add/Modify/Delete there will thus be 6 such results depending on their SUCCESS/FAILURE Iwill perhaps end up having 72 such if-else constructs.

Is this observation correct or my approach of getting the results as String is wrong?

Thanks for your time.