将springboot打包为JAR时，ServletContextEvent.getServletContext返回null [重复]答案

【问题标题】：When packaging springboot as JAR, the ServletContextEvent.getServletContext returns null [duplicate]将springboot打包为JAR时，ServletContextEvent.getServletContext返回null [重复]
【发布时间】：2018-05-13 04:01:09
【问题描述】：

这是我实现 CommandLineRunner 和 ServletContextListener 的代码，当 springboot 启动时，我想获取 ServletContext 并将数据放入其中。在正常情况下，这意味着不打包到 jar 只需在 Idea IDE 中启动 springboot 即可，但是当我将其打包到 jar 时，sce.getServletContext() 将为我返回 NUll。如何解决这个问题呢？谢谢。

@Order(10)
@Component("startupRunner")
public class StartupRunner implements CommandLineRunner, ServletContextListener {

    private ServletContext application = null;

    @Resource
    private FilmService filmService;

    @Resource
    private WebSiteInfoService webSiteInfoService;

    @Resource
    private LinkService linkService;

    @Autowired
    private WebSiteService webSiteService;

    @Override
    public void run(String... args) throws Exception {
        this.loadData();
    }


    public void loadData() {
        System.out.println("vincent.applicaiton" + application);
        application.setAttribute("newestInfoList", webSiteInfoService.list(null, 0, 10));
        Film film = new Film();
        film.setHot(1);
        application.setAttribute("newestHotFilmList", filmService.list(film, 0, 10));
        application.setAttribute("newestIndexHotFilmList", filmService.list(film, 0, 32));
        application.setAttribute("newestWebSiteList", webSiteService.newestList(0, 10));
        application.setAttribute("newestFilmList", filmService.list(null, 0, 10);
        application.setAttribute("linkList", linkService.listAll());
    }

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        //WebApplicationContext requiredWebApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext());
        //application= requiredWebApplicationContext.getServletContext();
        application = sce.getServletContext();

    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub

    }

}

【问题讨论】：

标签： java spring-boot servlets

【解决方案1】：

我用一个笨方法来解决这个问题，就是

@Override
public void run(String... args) throws Exception {
    if (application != null)
        this.loadData();
}

在使用mevan打包springboot的时候我做了验证，这个动作可以避免空点异常。有人有更优雅的解决方案吗？

【讨论】：