JSF 2 - 从托管bean获取PhaseListener的实例

Question

有没有方法通过el上下文或应用程序上下文获取PhaseListener的当前实例？

Answer 1

你可以连接到使用<f:phaseListener>代码的网页上这样的UIViewRoot的阶段监听器：

List<PhaseListener> phaseListeners = FacesContext.getCurrentInstance().getViewRoot().getPhaseListeners(); 

它返回附加到此UIViewRoot实例的PhaseListener实例的列表。

如果你想获得所有在faces-config.xml文件中注册的全球阶段监听器，你可以从的LifeCycle实例像这样让他们：

FacesContextFactory contextFactory = (FacesContextFactory)FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);  
LifecycleFactory lifecycleFactory = (LifecycleFactory)FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY); 
Iterator<String> lifecycleIds = lifecycleFactory.getLifecycleIds(); 
while (lifecycleIds.hasNext()) { 
    String lifecycleId = lifecycleIds.next(); 
    Lifecycle lifecycle = lifecycleFactory.getLifecycle(lifecycleId); 
    PhaseListener[] phaseListeners= lifecycle.getPhaseListeners(); 
} 

Documentation UIViewRoot

Documentation LifeCycle

Answer 2

您可以在JSF 2.0中获得当前PhaseID：

PhaseId currentPhaseId = FacesContext.getCurrentInstance().getCurrentPhaseId();