Spring Boot 常见监听类

有时候我们可能需要在Spring Boot 容器启动时做一些操作，执行一些代码Spring 提供的监听器可以很方便的实现这些需求

容器监听类

容器启动时监听

import org.springframework.context.ApplicationListener; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.event.ContextRefreshedEvent; /** * @author: mingan.xie * @since: 2020/9/3 * @history: 1.2020/9/3 created by xma */ @ComponentScan public class ApplicationStartingListener implements ApplicationListener<ContextRefreshedEvent>{ @Override public void onApplicationEvent(ContextRefreshedEvent event) { } }

容器启动完成时监听

import com.alibaba.excel.event.Order; import org.springframework.context.ApplicationListener; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.event.ContextRefreshedEvent; /** * @author: mingan.xie * @since: 2020/9/3 * @history: 1.2020/9/3 created by xma */ @ComponentScan public class ApplicationStartingListener implements ApplicationListener<ContextRefreshedEvent>, Order { @Override public void onApplicationEvent(ContextRefreshedEvent event) { } @Override public int order() { return 0; } }

启动类配置

在启动类中进行加载 import com.xma.blog.runner.ApplicationStartingListener; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Java8Application { public static void main(String[] args) { SpringApplication application = new SpringApplication(Java8Application.class); application.addListeners(new ApplicationStartingListener()); application.run(args); } }

web生命周期监听（Tomcat生命周期监听）

监听器配置

import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.annotation.WebListener; /** * @author: mingan.xie * @since: 2020/9/3 * @history: 1.2020/9/3 created by xma */ @WebListener public class ApplicationStartingRunner implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent sce) { // Tomcat启动时执行 } @Override public void contextDestroyed(ServletContextEvent sce) { // Tomcat销毁时执行 } }

启动类配置

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan; import org.springframework.context.annotation.ComponentScan; @SpringBootApplication @ServletComponentScan public class Java8Application { public static void main(String[] args) { SpringApplication.run(Java8Application.class, args); } }