Spring Boot的listener简单使用

监听器（Listener）的注册方法和 Servlet 一样，有两种方式：代码注册或者注解注册

1.代码注册方式

通过代码方式注入过滤器

@Bean

public ServletListenerRegistrationBean servletListenerRegistrationBean(){

ServletListenerRegistrationBean servletListenerRegistrationBean = new ServletListenerRegistrationBean();

servletListenerRegistrationBean.setListener(new IndexListener());

return servletListenerRegistrationBean;

}

IndexListener.Java类：

package com.example.Listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

public class IndexListener implements ServletContextListener{

@Override

public void contextDestroyed(ServletContextEvent arg0) {

System.out.println("IndexListener contextDestroyed method");

}

@Override

public void contextInitialized(ServletContextEvent arg0) {

System.out.println("IndexListener contextInitialized method");

}

}

2.注解方式

通过注解方式注入过滤器

IndexListener2.Java类

package com.example.Listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import javax.servlet.annotation.WebListener;

@WebListener

public class IndexListener2 implements ServletContextListener{

@Override

public void contextDestroyed(ServletContextEvent arg0) {

System.out.println("IndexListener2 contextDestroyed method");

}

@Override

public void contextInitialized(ServletContextEvent arg0) {

System.out.println("IndexListener2 contextInitialized method");

}

}

把注解加到入口处启动即可

@SpringBootApplication

@ServletComponentScan

public class SpringBootSimpleApplication {

public static void main(String[] args) {

SpringApplication.run(SpringBootSimpleApplication.class, args);

}

}