如何在ServletContextListener中获取springApplicationContext?

How to get spring ApplicationContext in ServletContextListener?

在 servet class 中可以这样得到 spring ApplicationContext

ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());

如何在 ServletContextListener 中访问 ApplicationContext,因为那里无法访问 getServletContext() 方法?

contextInitialized中:

public void contextInitialized(final ServletContextEvent event)
{
    ApplicationContext appCtx = WebApplicationContextUtils.getWebApplicationContext(event.getServletContext());
}