FacesRequestAttributes.java 文件源码

public static Object getAttribute(String name, ExternalContext externalContext) {
    Object session = externalContext.getSession(false);
    if (session instanceof PortletSession) {
        return ((PortletSession) session).getAttribute(name, PortletSession.APPLICATION_SCOPE);
    }
    else if (session != null) {
        return externalContext.getSessionMap().get(name);
    }
    else {
        return null;
    }
}