详解springboot整合Listener的两种方式

package cn.bl;

import org.springframework.boot.springapplication;

import org.springframework.boot.autoconfigure. springboot application;

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;

  }

}