/*** springBoot 整合 Listener 方式一：
 **
 ** 传统方式 一：
 **    <listener>
 **     <listener-class>com.linhw.demo.listener.FirstListener</listener-class>
 ** </listener>
 **/
@WebListener
public class FirstListener implements ServletContextListener{

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        //启动时，在控制台可以看到
        System.out.println("Listener...init......");
    }
    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }
}

@SpringBootApplication
@ServletComponentScan
public class App5 {

    public static void main(String[] args) {
        SpringApplication.run(App5.class, args);
    }
}

//与第一种方式的区别，就是没有加@WebListener注解
public class SecondListener implements ServletContextListener{

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        //启动时，在控制台可以看到
        System.out.println("Method Listener...init......");
    }
    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }
}

@SpringBootApplication
public class App6 {

    public static void main(String[] args) {
        SpringApplication.run(App6.class, args);
    }

    //添加@Bean将名为"getListener"的bean加入到容器中
    @Bean
    public ServletListenerRegistrationBean<SecondListener> getListener(){
        ServletListenerRegistrationBean<SecondListener> secondLisener = new ServletListenerRegistrationBean<SecondListener>(new SecondListener());
        return secondLisener;
    }
}