How to write an action class for an MVC web application in JSP?

I have followed this tutorial for developing a Java EE application in MVC pattern. But I was asked to write an action cl开发者_开发技巧asses for complete MVC. The tutorial does not contain an action class.

What is the use of an action class and how to create one?

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action class is basically your controller which processes the request made by client to server ..

login usinh jsp ..(if ur using lookupdispatch action)

package com.pra.loginmodel;

public class LoginAction extends LookupDispatchAction {

    /*
     * forward name="success" path=""
     */
    private static final String SUCCESS = "success";

    @Override
    protected Map getKeyMethodMap() {
        Map map = new HashMap();
        map.put("UserForm.login", "login");
        return map;
    }

    public ActionForward login(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        LoginActionFormBean lafb = (LoginActionFormBean) form;
        String userid = lafb.getUserid();
        if (!"false".equals(lafb.loginvalidate())) {
            HttpSession session = request.getSession();
            session.setAttribute("user", userid);
            FormBean fb = new FormBean();
            r.setUserid(userid);
            r.show();
            return mapping.findForward(LOGGER);
        } else {
            return mapping.findForward(LOGGER);
        }
    }
}

here logincvalidate is function where u match userid and password with ur database ... this is simple action class u can use for login jsp