Redirect to page using JSF PhaseListener

问题

Scenario 1: If the friendlyURL is '/requestform/servicerequest' and requestProcessorBean.userRequestVO == null then invalidate the session and redirect to '/web/pds/login' page..

Scenario 2: If the If the friendlyURL is '/requestform/servicerequest' and requestProcessorBean.userRequestVO != null then redirect to 'serviceRequest.xhtml' page.

I want to know how I can Scenario 1 implement using JSF Phase Listener. I have implemented Scenario 1 as follows: requestForm.xhtml:

<?xml version="1.0" encoding="UTF-8"?>
<f:view xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
    </h:head>
    <h:body>
        <h:outputFormat rendered="#{lookupBean.friendlyURL == '/requestform/servicerequest' and (requestProcessorBean.userRequestVO != null)}">
            <ui:include src="serviceRequest.xhtml" />
        </h:outputFormat>
    </h:body>
</f:view>

I am using Liferay 6.0 and JSF 2.0.

Thanks

回答1:

I really won't recommend a phase listener for the conditional redirect. Use instead, the <f:event type="preRenderView"/>. If however, for some reason you're constrained to use a phaselistener, your implementation would look like this:

Define a PhaseListener to look like this

/*we're defining the PhaseListener as a ManagedBean so
 * we can inject other beans into it 
 */
@ManagedBean(name = "thePhaseListener")
@RequestScoped
public class TestPhaseListener implements PhaseListener {


   @ManagedProperty(value = "#{requestProcessorBean}")
   transient private RequestProcessorBean requestProcessorBean;

   @ManagedProperty(value = "#{lookupBean}")
   transient private LookupBean lookupBean;

   @Override
   public void afterPhase(PhaseEvent event) {
      //throw new UnsupportedOperationException("Not supported yet.");
   }

   @Override
   public void beforePhase(PhaseEvent event) {

       try {

          if (lookupBean.getFriendlyURL.equals("/requestform/servicerequest") && (requestProcessorBean.getUserRequestVO() == null)) {
            event.getFacesContext().getExternalContext().redirect("/web/pds/login");
           }
        } catch (IOException ex) {
          Logger.getLogger(TestPhaseListener.class.getName()).log(Level.SEVERE, null, ex);
        }
     }

   @Override
   public PhaseId getPhaseId() {
      return PhaseId.RESTORE_VIEW; // The RESTORE_VIEW phase is the first in the lifecycle of a JSF view
   }
}

Register your new PhaseListener with the tag below on the page you desire
```
<f:phaseListener type="com.you.TestPhaseListener"/>
```

Like I mentioned at the beginning of this post, this approach is unnecessarily clunky, too much effort to achieve so little and IMO, an abuse of phaselisteners.

来源：https://stackoverflow.com/questions/15704581/redirect-to-page-using-jsf-phaselistener

标签

jsf-2

liferay-6