how to map from servlet to servlet?

[yamato]

Hi all,

i will like to ask this question. The current spring example illustrate on mapping from a controller to a jsp page.What if i have to do in certain situations such as from this controller go to another controller before reaching a jsp page , as my concept always go through a controller first before reaching a view,so if for example login page unsuccessful eg.loginController unsuccessful -> startingController b4 outputting desired result in a jsp page.BTW i'm quite a noob..so asking quite a lot.i will be grateful if there's some examples to illustrate thanks.

[Dave Syer]

There's nothing to prevent your controllers from knowing about each other through dependency injection. E.g.

public class LoginController implements Controller {

    private Controller startingController; // setter ommitted

    public ModelAndView handleRequest(...) {
        ...
        if (unsuccessful) {
            return startingController.handleRequest(...);
        }
        return ...;
    }

}

But that's also not the only way to implement this kind of rule (e.g. Spring Security uses a ServletFilter to detect and redirect on unsuccessful authentication).