Struts-JSP execute action class without manual submission

In a STRUTS-JSP , how do we submit an action without submit step/without user interaction. When a JSP is run , would like the *.do (action class) to be executed automatically. I gues similar to onload of JSP. But I am not sure which method needs to be called and what attributes need to be passed. Exlplanation of the flow and an example will be of great help

I understand the workflow of defining an ActionForm, associate it with a submitting JSP page, passing it to an Action and forwarding the results to a view JSP page; what I'm not seeing is how to generate a dynamic JSP page without the submit step?...

Thanks