详解springboot整合Listener的两种方式

package cn.bl;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;@SpringBootApplication@ServletComponentScanpublic class App { public static void main(String[] args) { SpringApplication.run(App.class, args); }}

package cn.bl.listener;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import javax.servlet.annotation.WebListener;@WebListenerpublic class FirstListener implements ServletContextListener{ @Override public void contextInitialized(ServletContextEvent sce) { System.out.println("init .. "); } @Override public void contextDestroyed(ServletContextEvent sce) { System.out.println("desroyed .. "); }}

package cn.bl.listener;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class SecondListener implements ServletContextListener{ @Override public void contextInitialized(ServletContextEvent sce) { System.out.println("second servletListener init .. "); } @Override public void contextDestroyed(ServletContextEvent sce) { System.out.println("second servletListener destroy .. "); }}package cn.bl;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;import org.springframework.context.annotation.Bean;import cn.bl.listener.SecondListener;@SpringBootApplicationpublic class App2 { public static void main(String[] args) { SpringApplication.run(App2.class, args); } @Bean public ServletListenerRegistrationBean<SecondListener>getBean(){ ServletListenerRegistrationBean<SecondListener>bean = new ServletListenerRegistrationBean<>(new SecondListener()); return bean; }}