最后一个连接步骤是使我们的表现层和我们的业务层交互。这已经通过使用前面讨论的服务定位器来完成了。服务层充当一个到我们的业务逻辑和持久层的接口。这儿是 Struts中的SaveNewOrder Action可能怎样使用一个服务定位器调用一个业务方法：public ActionForward execute( ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws java.lang.Exception { OrderForm oForm = (OrderForm)form; // Use the form to build an Order object that // can be saved in the persistence layer. // See the full source code in the sample app. // Obtain the wired business service object // from the service locator configuration // in BaseAction. // Delegate the save to the service layer and // further upstream to save the Order object. getOrderService().saveNewOrder(order); oForm.setOrder(order); ActionMessages messages = new ActionMessages(); messages.add( ActionMessages.GLOBAL_MESSAGE, new ActionMessage( "message.order.saved.successfully")); saveMessages(request, messages); return mapping.findForward("success"); }
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