类 AbstractController
- java.lang.Object
- org.springframework.context.support.ApplicationObjectSupport
- org.springframework.web.portlet.context.PortletApplicationObjectSupport
- org.springframework.web.portlet.handler.PortletContentGenerator
- org.springframework.web.portlet.mvc.AbstractController
- 所有已实现的接口:
Aware,ApplicationContextAware,PortletContextAware,Controller
public abstract class AbstractController extends PortletContentGenerator implements Controller
Convenient superclass for controller implementations, using the Template Method design pattern.As stated in the
Controllerinterface, a lot of functionality is already provided by certain abstract base controllers. The AbstractController is one of the most important abstract base controller providing basic features such controlling if a session is required and render caching.Workflow (and that defined by interface):
- If this is an action request,
handleActionRequestwill be called by the DispatcherPortlet once to perform the action defined by this controller. - If a session is required, try to get it (PortletException if not found).
- Call method
handleActionRequestInternal, (optionally synchronizing around the call on the PortletSession), which should be overridden by extending classes to provide actual functionality to perform the desired action of the controller. This will be executed only once. - For a straight render request, or the render phase of an action request (assuming the same controller is called for the render phase -- see tip below),
handleRenderRequestwill be called by the DispatcherPortlet repeatedly to render the display defined by this controller. - If a session is required, try to get it (PortletException if none found).
- It will control caching as defined by the cacheSeconds property.
- Call method
handleRenderRequestInternal, (optionally synchronizing around the call on the PortletSession), which should be overridden by extending classes to provide actual functionality to returnModelAndViewobjects. This will be executed repeatedly as the portal updates the current displayed page.
Exposed configuration properties (and those defined by interface):
name default description requireSession false whether a session should be required for requests to be able to be handled by this controller. This ensures, derived controller can - without fear of Nullpointers - call request.getSession() to retrieve a session. If no session can be found while processing the request, a PortletException will be thrown synchronizeOnSession false whether the calls to handleRenderRequestInternalandhandleRenderRequestInternalshould be synchronized around the PortletSession, to serialize invocations from the same client. No effect if there is no PortletSession.cacheSeconds -1 indicates the amount of seconds to specify caching is allowed in the render response generatedby this request. 0 (zero) will indicate no caching is allowed at all, -1 (the default) will not override the portlet configuration and any positive number will cause the render response to declare the amount indicated as seconds to cache the content renderWhenMinimized false whether should be rendered when the portlet is in a minimized state -- will return null for the ModelandView when the portlet is minimized and this is false TIP: The controller mapping will be run twice by the PortletDispatcher for action requests -- once for the action phase and again for the render phase. You can reach the render phase of a different controller by simply changing the values for the criteria your mapping is using, such as portlet mode or a request parameter, during the action phase of your controller. This is very handy since redirects within the portlet are apparently impossible. Before doing this, it is usually wise to call
clearAllRenderParametersand then explicitly set all the parameters that you want the new controller to see. This avoids unexpected parameters from being passed to the render phase of the second controller, such as the parameter indicating a form submit ocurred in anAbstractFormController.Thanks to Rainer Schmitz and Nick Lothian for their suggestions!
- 从以下版本开始:
- 2.0
- 作者:
- John A. Lewis, Juergen Hoeller
- 另请参阅:
ResourceAwareController,EventAwareController
字段概要
从类继承的字段 org.springframework.context.support.ApplicationObjectSupport
logger
构造器概要
构造器 构造器 说明 AbstractController()
方法概要
所有方法 实例方法 具体方法 修饰符和类型 方法 说明 voidhandleActionRequest(ActionRequest request, ActionResponse response)Process the action request.protected voidhandleActionRequestInternal(ActionRequest request, ActionResponse response)Subclasses are meant to override this method if the controller is expected to handle action requests.ModelAndViewhandleRenderRequest(RenderRequest request, RenderResponse response)Process the render request and return a ModelAndView object which the DispatcherPortlet will render.protected ModelAndViewhandleRenderRequestInternal(RenderRequest request, RenderResponse response)Subclasses are meant to override this method if the controller is expected to handle render requests.booleanisRenderWhenMinimized()Return whether controller will render when portlet is minimized.booleanisSynchronizeOnSession()Return whether controller execution should be synchronized on the session.voidsetRenderWhenMinimized(boolean renderWhenMinimized)Set if the controller should render an view when the portlet is in a minimized window.voidsetSynchronizeOnSession(boolean synchronizeOnSession)Set if controller execution should be synchronized on the session, to serialize parallel invocations from the same client.从类继承的方法 org.springframework.web.portlet.handler.PortletContentGenerator
applyCacheSeconds, cacheForSeconds, check, checkAndPrepare, checkAndPrepare, getCacheSeconds, isRequireSession, preventCaching, setCacheSeconds, setRequireSession
从类继承的方法 org.springframework.web.portlet.context.PortletApplicationObjectSupport
getPortletContext, getTempDir, isContextRequired, setPortletContext
从类继承的方法 org.springframework.context.support.ApplicationObjectSupport
getApplicationContext, getMessageSourceAccessor, initApplicationContext, initApplicationContext, requiredContextClass, setApplicationContext
构造器详细资料
AbstractController
public AbstractController()
方法详细资料
setSynchronizeOnSession
public final void setSynchronizeOnSession(boolean synchronizeOnSession)
Set if controller execution should be synchronized on the session, to serialize parallel invocations from the same client.More specifically, the execution of the
handleActionRequestInternalmethod will get synchronized if this flag is "true". The best available session mutex will be used for the synchronization; ideally, this will be a mutex exposed by HttpSessionMutexListener.The session mutex is guaranteed to be the same object during the entire lifetime of the session, available under the key defined by the
SESSION_MUTEX_ATTRIBUTEconstant. It serves as a safe reference to synchronize on for locking on the current session.In many cases, the PortletSession reference itself is a safe mutex as well, since it will always be the same object reference for the same active logical session. However, this is not guaranteed across different servlet containers; the only 100% safe way is a session mutex.
isSynchronizeOnSession
public final boolean isSynchronizeOnSession()
Return whether controller execution should be synchronized on the session.
setRenderWhenMinimized
public final void setRenderWhenMinimized(boolean renderWhenMinimized)
Set if the controller should render an view when the portlet is in a minimized window. The default is false.
isRenderWhenMinimized
public final boolean isRenderWhenMinimized()
Return whether controller will render when portlet is minimized.
handleActionRequest
public void handleActionRequest(ActionRequest request, ActionResponse response) throws Exception
从接口复制的说明:ControllerProcess the action request. There is nothing to return.- 指定者:
handleActionRequest在接口中Controller- 参数:
request- current portlet action requestresponse- current portlet action response- 抛出:
Exception- in case of errors
handleRenderRequest
public ModelAndView handleRenderRequest(RenderRequest request, RenderResponse response) throws Exception
从接口复制的说明:ControllerProcess the render request and return a ModelAndView object which the DispatcherPortlet will render. Anullreturn value is not an error: It indicates that this object completed request processing itself, thus there is no ModelAndView to render.- 指定者:
handleRenderRequest在接口中Controller- 参数:
request- current portlet render requestresponse- current portlet render response- 返回:
- a ModelAndView to render, or null if handled directly
- 抛出:
Exception- in case of errors
handleActionRequestInternal
protected void handleActionRequestInternal(ActionRequest request, ActionResponse response) throws Exception
Subclasses are meant to override this method if the controller is expected to handle action requests. The contract is the same as forhandleActionRequest.The default implementation throws a PortletException.
handleRenderRequestInternal
protected ModelAndView handleRenderRequestInternal(RenderRequest request, RenderResponse response) throws Exception
Subclasses are meant to override this method if the controller is expected to handle render requests. The contract is the same as forhandleRenderRequest.The default implementation throws a PortletException.