springBoot整合Listener

新建项目

 这个是pom文件

<properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

 新建FirstListener类

FirstListener.java

package com.gongspringlister.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) {

    }

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

 新建App.java启动类

App.java

package com.gongspringlister;

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);
    }
}

运行启动类

 SpringBoot 整合 Listener 方式二

 新建SecondListener类

SecondListener.java

package com.gongspringlister.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
/**
 * springBoot 整合 Listener 方式二
 * * *
 */
@WebListener
public class SecondListener implements ServletContextListener {
    @Override
    public void contextDestroyed(ServletContextEvent arg0) {

    }

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

编写启动类App2.java

App2.java

package com.gongspringlister;

import com.gongspringlister.listener.SecondListener;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;

/**
 * SpringBoot 整合 Listener 方式二* * *
 */
@SpringBootApplication
public class App2 {
    public static void main(String[] args){
        SpringApplication.run(App2.class,args);
    }

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

运行启动类App2.java