How to call bean method on every page request

问题

In my work we develop an JSF 2 application. And I need to create a listener bean with one method which have to be executed on every page request. How to accomplish this task?

回答1:

The answer of your question can be found here.

This method is crucial:

public void beforePhase(PhaseEvent event) {
    if (event.getPhaseId() == PhaseId.RENDER_RESPONSE) {
        // Do here your job which should run right before the RENDER_RESPONSE.
    }
}

Here you can react on every lifecycle phase and call your apropriate functions inside the needed PhaseId. I hope it helps.

As I see that you use JSF 2, you could also use the following method:

Use this inside your xhtml page:

<f:event type="preRenderView" listener="#{bean.preRenderView}" />

and call the apropriate method in your bean:

public void preRenderView() {
    // Do here your job which should run right before the RENDER_RESPONSE.
}

回答2:

One way to do it is filter. Create class:

public class MonitoringFilter implements Filter {
    @Override
    public void doFilter(ServletRequest _request, ServletResponse _response,
        FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)_request;
        HttpServletResponse response = (HttpServletResponse)_response;

        // your code here
        chain.doFilter(_request, _response);
    }
}

  <filter>
    <filter-name>monitoringFilter</filter-name>
    <filter-class>xyz.MonitoringFilter</filter-class>
  </filter>

  <filter-mapping>
    <filter-name>monitoringFilter</filter-name>
    <url-pattern>/*.jsf</url-pattern>
  </filter-mapping>

(setup proper path in url-pattern).

回答3:

I solved it. At first I tried with filter but it didn't because the filter is called at begining of the request, but at that time FacesContext is not initialised and I needed because I have to retrieve the requested url. So after that I tried with phase listener and it works! In beforePhase() method I listen for PhaseId.RENDER_RESPONSE. Thank you all for guidance.

来源：https://stackoverflow.com/questions/21440904/how-to-call-bean-method-on-every-page-request

标签

jsf-2

jboss

listener