JSF PhaseListener for logging request and session information.

MyPhaseListener.java

package javaee.util.jsf.phaselistener;

import java.util.Map;

import javax.faces.component.UIViewRoot;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.servlet.http.HttpSession;

/**
<lifecycle> 
  <phase-listener>javaee.util.jsf.phaselistener.MyPhaseListener</phase-listener> 
</lifecycle>
*/
public class MyPhaseListener implements PhaseListener { 
	public void afterPhase(PhaseEvent event) { 
		printLog(event, "after phase:"); 
	} 

	public void beforePhase(PhaseEvent event) { 
		printLog(event, "before phase:"); 
	} 

	protected void printLog(PhaseEvent event, String msg) { 
		UIViewRoot view = event.getFacesContext().getViewRoot(); 
		String viewID = "no view"; 
		if (view != null) viewID = view.getViewId(); 
		System.out.println(msg + event.getPhaseId() + " " + viewID);
		
        printRequestParameters(event);
        printRequestAttributes(event);        
		printSessionAttributes(event);
		
	}

    private void printSessionAttributes(PhaseEvent event) {
        Map<String,Object> sessAttrs = event.getFacesContext().getExternalContext().getSessionMap();
        StringBuilder sb = new StringBuilder();
        for (String key : sessAttrs.keySet()) {
            sb.append("(" + key + "=" + sessAttrs.get(key) + ") ");
            }
        System.out.println("Session Attributes : " + sb.toString());
    }

    private void printRequestAttributes(PhaseEvent event) {
        Map<String,Object> reqAttrs = event.getFacesContext().getExternalContext().getRequestMap();
        StringBuilder sb = new StringBuilder();
        for (String key : reqAttrs.keySet()) {
            sb.append("(" + key + "=" + reqAttrs.get(key) + ") ");
            }
        System.out.println("Request Attributes : " + sb.toString());
    }

    private void printRequestParameters(PhaseEvent event) {
        Map<String, String> reqParams = event.getFacesContext().getExternalContext().getRequestParameterMap();
        StringBuilder sb = new StringBuilder();
        for (String key : reqParams.keySet()) {
            sb.append("(" + key + "=" + reqParams.get(key) + ") ");
            }
        System.out.println("Request Parameters : " + sb.toString());
    } 

    
    
	public PhaseId getPhaseId() { 
		return PhaseId.ANY_PHASE; 
	} 
}