JSF2.0实战 - 1-3、Hello World，AJAX体验，onPageLoad

package test; import javax.faces.component.UIViewRoot; import javax.faces.context.FacesContext; import javax.faces.event.PhaseEvent; import javax.faces.event.PhaseId; import javax.faces.event.PhaseListener; public class FacesPage { public FacesPage() { FacesContext.getCurrentInstance().getViewRoot().addPhaseListener(new PageLoadListener()); } protected void onPageLoad() { } protected boolean isPostback() { return FacesContext.getCurrentInstance().isPostback(); } private class PageLoadListener implements PhaseListener { private static final long serialVersionUID = 1602328501512626684L; @Override public void afterPhase(PhaseEvent e) { UIViewRoot viewRoot = e.getFacesContext().getViewRoot(); viewRoot.removePhaseListener(this); } @Override public void beforePhase(PhaseEvent e) { FacesPage.this.onPageLoad(); } @Override public PhaseId getPhaseId() { return PhaseId.RENDER_RESPONSE; } } }