02-03:springboot 整合listener

1.通过注解扫描完成Listener组件的注册

1.1 编写listener

/**
 * Springboot 整合listener
 */
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
@WebListener
public class FirstListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        // TODO Auto-generated method stub
        System.out.println("listener Init");
    }
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub
    }
}

1.2编写启动类

/**
 * springboot整合listener 方式一
 * @author Administrator
 *
 */
@SpringBootApplication
@ServletComponentScan
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

2.通过方法完成Listener组件的注册

2.1编写listener

public class SecondListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        // TODO Auto-generated method stub
        System.out.println("secondListener....");
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub

    }

}

2.2 编写启动器

/**
 * SpringBoot 整合Listener方式2
 *
 * @author Administrator
 *
 */
@SpringBootApplication
public class App2 {
    public static void main(String[] args) {
        SpringApplication.run(App2.class, args);
    }
    /**
     * 注册listener
     */
    @Bean
    public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){
        ServletListenerRegistrationBean<SecondListener> bean= new ServletListenerRegistrationBean<SecondListener>(new SecondListener());
        return bean;
    }
}