[Java] 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
@servletcomponentscan
public 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;
@weblistener
public 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;
@springbootapplication
public 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;
 }
}