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);
}
}