Springboot監聽器的使用

創建監聽器

@WebListener
public class ContextListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        MsgUtils.println("自定義監聽器:ServletContextListener->contextInitialized");
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {

    }
}

運行結果：

也可以不用@WebListener這個註解，在啓動類Application中添加bean或者另外創建配置文件即可。

@Configuration
public class ListenerConfig {
    @Bean
    public ServletListenerRegistrationBean servletListenerRegistrationBean() {
        ServletListenerRegistrationBean slrBean = new ServletListenerRegistrationBean();
        slrBean.setListener(new ContextListener());
        return slrBean;
    }
}