SpringBoot----整合 Listener

一.通過註解掃描完成 Listener 組件的註冊

1.1 編寫 Listener

package com.bjsxt.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
/**
 * springBoot整合Listener
 *
 *<listener>
 *	<listener-class>com.bjsxt.listener.FirstListener</listener-class>
 *</listener>
 */
@WebListener
public class FirstListener implements ServletContextListener {

	@Override
	public void contextDestroyed(ServletContextEvent arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public void contextInitialized(ServletContextEvent arg0) {
		System.out.println("Listener...init......");

	}

}

1.2 編寫啓動類

package com.bjsxt;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

/**
 * springBoot整合Listener方式一
 *
 *
 */
@SpringBootApplication
@ServletComponentScan
public class App {

	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}

}

二.通過方法完成 Listener 組件註冊

2.1 編寫 Listener

package com.bjsxt.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
 * springBoot整合Listener方式二。
 *
 *
 */
public class SecondListener implements ServletContextListener {

	@Override
	public void contextDestroyed(ServletContextEvent arg0) {
		// TODO Auto-generated method stub
	}

	@Override
	public void contextInitialized(ServletContextEvent arg0) {
		System.out.println("SecondListener..init.....");
	}

}

2.2 編寫啓動類

package com.bjsxt;

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 com.bjsxt.listener.SecondListener;

/**
 * SpringBoot整合Listener方式二
 *
 *
 */
@SpringBootApplication
public class App2 {

	public static void main(String[] args) {
		SpringApplication.run(App2.class, args);

	}
	/**
	 * 註冊listener
	 */
	@Bean
	public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){
		ServletListenerRegistrationBean<SecondListener> bean= new ServletListenerRegistrationBean<SecondListener>(new SecondListener());
		return bean;
	}
}