JSF 2 - 从托管bean获取PhaseListener的实例

Question

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

Answer 1

您可以在页面上使用<f:phaseListener>标记将相位侦听器附加到UIViewRoot：

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

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

如果要获取在faces-config.xml文件中注册的所有全局阶段侦听器，可以从LifeCycle实例中获取它们，如下所示：

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

您可以使用以下命令获取JSF 2.0中的当前PhaseID：

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