所有已知实现类:
AbstractController, ParameterizableViewController, PortletModeNameViewController, PortletWrappingController
```
public interface Controller
```
Base portlet Controller interface, representing a component that receives RenderRequest/RenderResponse and ActionRequest/ActionResponse like a Portlet but is able to participate in an MVC workflow.
Any implementation of the portlet Controller interface should be a reusable, threadsafe class, capable of handling multiple portlet requests throughout the lifecycle of an application. To be able to configure Controller(s) in an easy way, Controllers are usually JavaBeans.
Workflow:
After the DispatcherPortlet has received a request and has done its work to resolve locales, themes and suchlike, it tries to resolve a Controller to handle that request, using a HandlerMapping. When a Controller has been found, the handleRenderRequest or handleActionRequest method will be invoked, which is responsible for handling the actual request and - if applicable - returning an appropriate ModelAndView. So actually, these method are the main entrypoint for the DispatcherPortlet which delegates requests to controllers.
So basically any direct implementation of the Controller interface just handles RenderRequests/ActionRequests and should return a ModelAndView, to be further used by the DispatcherPortlet. Any additional functionality such as optional validation, form handling, etc should be obtained through extending one of the abstract controller classes mentioned above.
从以下版本开始:
2.0
作者:
William G. Thompson, Jr., John A. Lewis
另请参阅:
ResourceAwareController, EventAwareController, SimpleControllerHandlerAdapter, AbstractController, PortletContextAware

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`void`	`handleActionRequest(ActionRequest request, ActionResponse response)`	Process the action request.
`ModelAndView`	`handleRenderRequest(RenderRequest request, RenderResponse response)`	Process the render request and return a ModelAndView object which the DispatcherPortlet will render.

- 方法详细资料
  - handleActionRequest
```
void handleActionRequest(ActionRequest request,
                         ActionResponse response)
                  throws Exception
```
    Process the action request. There is nothing to return.
    参数:
    request - current portlet action request
    response - current portlet action response
    抛出:
    Exception - in case of errors
  - handleRenderRequest
```
ModelAndView handleRenderRequest(RenderRequest request,
                                 RenderResponse response)
                          throws Exception
```
    Process the render request and return a ModelAndView object which the DispatcherPortlet will render. A null return value is not an error: It indicates that this object completed request processing itself, thus there is no ModelAndView to render.
    参数:
    request - current portlet render request
    response - current portlet render response
    返回:
    a ModelAndView to render, or null if handled directly
    抛出:
    Exception - in case of errors

接口 Controller

方法概要

方法详细资料

handleActionRequest

handleRenderRequest