Stecks集成Struts (二)

原来是想自己写下学习过程的, 结果却搞成了翻译, 而且还不是完整翻译.
呵呵, 就当翻译吧, 也就贴出来了.

http://strecks.sourceforge.net/doc-actions.php

1.  Actions
在stecks中, 传统的Strtus Action被分离为两个对象.
一个是controller action 另一个是 an action bean.

 

1.1 Controller Actions
Controller Action (也被称作Action Controller) 背后的想法是:
一般的request 处理逻辑可以是抽象的并被许多action重用.

比如, 简单的CRUD web 应用通常使用三种类型的request 处理逻辑:
@ActionInterface(name = BasicSubmitAction.class)
public class BasicSubmitController extends BaseBasicController
{

    @Override
    protected ViewAdapter executeAction(Object actionBean, ActionContext context)
    {
   
        BasicSubmitAction action = (BasicSubmitAction) actionBean;
        ActionForm form = context.getForm();
   
        HttpServletRequest request = context.getRequest();
   
        boolean cancelled = false;
        if (request.getAttribute(Globals.CANCEL_KEY) != null)
        {
            cancelled = true;
        }
   
        if (form instanceof BindingForm && !cancelled)
        {
            action.preBind();
            BindingForm bindingForm = (BindingForm) form;
            bindingForm.bindInwards();
        }
   
        String result = cancelled ? action.cancel() : action.execute();
        return getActionForward(context, result);
   
    }

}
Stecks已经有很多内建的controller, 模仿DispatchAction, MappingDispatchAction and LookupDispatchAction的行为.

 

1.2 Action Beans
在request 处理逻辑被抽到controller action 之后, 接下来action bean就只需处理特定的业务逻辑了.

在Stecks中, action bean 将被配置到struts-config.xml中, 就好像原来的strtus action一样.
当第一次被调用时, 这个action bean的annotation被用来确定controller, 同时controller的实例将被创建.
controller 集成了Action, 将被保留在action缓存中,可以处理后续的/并发的请求.
每次接受到请求之后, controller将会创建一个新的action bean的实例. action controller自己是无状态的, 并被多个请求共享.

默认情况下, action bean 和 action controller 的对应如下:
org.strecks.action.BasicAction  org.strecks.action.basic.BasicController 
org.strecks.action.BasicFormAction  org.strecks.action.basic.BasicFormController 
org.strecks.action.BasicSubmitAction  org.strecks.action.basic.BasicSubmitController 
org.strecks.action.BasicDispatchAction  org.strecks.action.basic.BasicDispatchController 
org.strecks.action.NavigableAction  org.strecks.action.navigable.NavigableController 
org.strecks.action.NavigableFormAction  org.strecks.action.navigable.NavigableFormController 
org.strecks.action.NavigableSubmitAction  org.strecks.action.navigable.NavigableSubmitController 
org.strecks.action.NavigableDispatchAction  org.strecks.action.navigable.NavigableDispatchController