3. integrate listener

This paper is finally updated at 915 Days ago, , The information may have developed or changed .

Complete with annotation scan Listener Registration of components

• 1.1 To write Listener

/*** springBoot  Integrate  Listener 
<listener> 
<listener-class>com.bjsxt.listener.FirstListener</listener-class> 
</listener> 

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@WebListener 
public class FirstListener implements ServletContextListener { 
    @Override 
    public void contextDestroyed(ServletContextEvent arg0) {
        // TODO Auto-generated method stub 
        }
        @Override 
        public void contextInitialized(ServletContextEvent arg0) { 
            System.out.println("Listener...init......"); 
        } 
    }

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• 1.2 Write the startup class

/*** springBoot  Integrate  Listener  Mode one  ***/ 
@SpringBootApplication @ServletComponentScan 
public class App { 
    public static void main(String[] args) { 
        SpringApplication.run(App.class, args); 
    } 
}

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To complete by means of Listener Component registration

• 2.1 To write Listener

/*** springBoot  Integrate  Listener  Mode two . ***/ 
public class SecondListener implements ServletContextListener { 
    @Override 
    public void contextDestroyed(ServletContextEvent arg0) { 
        // TODO Auto-generated method stub 
    }
    @Override 
    public void contextInitialized(ServletContextEvent arg0) { 
        System.out.println("SecondListener..init....."); 
    } 
}

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• 2.2 Write the startup class

/*** SpringBoot  Integrate  Listener  Mode two ***/ 
@SpringBootApplication 
public class App2 { 
    public static void main(String[] args) { 
        SpringApplication.run(App2.class, args); 
        }
    /***  register  listener */ 
    @Bean 
    public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){ 
        ServletListenerRegistrationBean<SecondListener> bean= new ServletListenerRegistrationBean<SecondListener>(new SecondListener()); 
        return bean; 
    } 
}

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