【转载】springboot整合Listener的两种方式

目录

• 1.通过注解
• 2.通过函数

大佬文章，请优先查看：详解springboot整合Listener的两种方式

1.通过注解

编写启动类

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);
    }
}

编写一个监听器

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 .. ");
    }
}

当执行启动类的时候

2.通过函数

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 .. ");
    }
}

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;
    }
}