PortletWrappingController.java 文件源码

@Override
public ModelAndView handleResourceRequest(
        ResourceRequest request, ResourceResponse response) throws Exception {

    if (!(this.portletInstance instanceof ResourceServingPortlet)) {
        throw new NoHandlerFoundException("Cannot handle resource request - target portlet [" +
                this.portletInstance.getClass() + " does not implement ResourceServingPortlet");
    }
    ResourceServingPortlet resourcePortlet = (ResourceServingPortlet) this.portletInstance;

    // Delegate to PortletContentGenerator for checking and preparing.
    checkAndPrepare(request, response);

    // Execute in synchronized block if required.
    if (isSynchronizeOnSession()) {
        PortletSession session = request.getPortletSession(false);
        if (session != null) {
            Object mutex = PortletUtils.getSessionMutex(session);
            synchronized (mutex) {
                resourcePortlet.serveResource(request, response);
                return null;
            }
        }
    }

    resourcePortlet.serveResource(request, response);
    return null;
}