Struts - link x action

<a href="usuarios.do">Usuarios</a><br>

public class UsuarioAction extends LookupDispatchAction{

	protected Map getKeyMethodMap() {
	
	      Map map = new HashMap();
	      map.put("botao.buscar", "buscar");
	      map.put("botao.buscarTodos", "buscarTodos");
	      return map;
	}

	public ActionForward buscarTodos(ActionMapping mapping, ActionForm form, HttpServletRequest req, HttpServletResponse res)
			throws Exception{

		UsuarioForm usuarioForm = (UsuarioForm) form;
		ActionForward view = null;
		return view;
	}
}