Spring下得到当前的上下文

• 新建一个类，来装Spring的上下文

public class SpringContext {
    private static ApplicationContext applicationContext;

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    public static void setApplicationContext(ApplicationContext applicationContext) {
        SpringContext.applicationContext = applicationContext;
    }
}

• 新建一个系统初始化的监听器，用来将上下文装到我们的SpringContext

public class InitListener implements ServletContextListener {
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext sc = sce.getServletContext();
        ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(sc);
        SpringContext.setApplicationContext(context);  
        new Thread(new KafkaConsumer("cache-message")).start();
    }
    public void contextDestroyed(ServletContextEvent sce) {
    }
}

同时也给这个InitListener类初始化到Spring

   @SuppressWarnings({ "rawtypes", "unchecked" })
    @Bean
    public ServletListenerRegistrationBean servletListenerRegistrationBean() {
        ServletListenerRegistrationBean servletListenerRegistrationBean = 
                new ServletListenerRegistrationBean();
        servletListenerRegistrationBean.setListener(new InitListener());  
        return servletListenerRegistrationBean;
    }

• 在业务逻辑类中调用即可

CacheService cacheService=(CacheService) SpringContext.getApplicationContext()
                .getBean("cacheService");