FacesRequestAttributes.java 文件源码

public static String[] getAttributeNames(ExternalContext externalContext) {
    Object session = externalContext.getSession(false);
    if (session instanceof PortletSession) {
        return StringUtils.toStringArray(
                ((PortletSession) session).getAttributeNames(PortletSession.APPLICATION_SCOPE));
    }
    else if (session != null) {
        return StringUtils.toStringArray(externalContext.getSessionMap().keySet());
    }
    else {
        return new String[0];
    }
}