使用监听器来启动spring

<context-param>
      <param-name>contextConfigLocation</param-name> //注意这里对应的spring前端控制器的<param-value>不用写
      <param-value>org.chu.config</param-value>
    </context-param>
    <context-param>
       <param-name>contextClass</param-name>
       <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
    </context-param>
    <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

public class DataInitializeListener implements ServletContextListener  {
    
    //问题：Spring的依赖注入只能在Spring容器中的对象使用。而监听器不是Spring容器的对象。
    //解决方法：在非容器里的对象获得容器里面的对象，容器对象.getBean();

    /**
     * 上下文初始化的时候调用的方法
     */
    @Override
    public void contextInitialized(ServletContextEvent sce) {
    
     System.out.println("==启动啦==");
     ServletContext context = sce.getServletContext();
     //ApplicationContext 
     WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(context);
     RoleService roleService = applicationContext.getBean(RoleService.class);
     DictionaryService dictionaryService = applicationContext.getBean(DictionaryService.class);
     ModularService modularService=applicationContext.getBean(ModularService.class);
     PermissionService permissionService=applicationContext.getBean(PermissionService.class);
     UserService userService = applicationContext.getBean(UserService.class);
     AreaService areaService = applicationContext.getBean(AreaService.class);
     CustomerSerivce customerSerivce = applicationContext.getBean(CustomerSerivce.class);
     
    }

    /**
     * 上下文销毁的时候调用的方法
     */
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        System.out.println("==关闭了==");
        ServletContext context = sce.getServletContext();
        context.removeAttribute("global_roles");
        context.removeAttribute("global_dictionarys");
        
    }

}