标签：执行 ext 过程 star listen package context rri ide
在springboot 容器启动时，我们需要在启动过程中做一些操作，比如启动容器后，执行某些代码。
spring 提供了监听器，我们可以方便的实现这些操作。
在容器启动开始时：
package com.neo.filter; import org.springframework.boot.context.event.ApplicationStartingEvent; import org.springframework.context.ApplicationListener; public class ApplicationStartingEventListener implements ApplicationListener<ApplicationStartingEvent> { @Override public void onApplicationEvent(ApplicationStartingEvent arg0) { System.err.println("ApplicationStartingEventListener"); } }
在容器启动完成后执行操作：
package com.neo.filter; import org.springframework.boot.context.event.ApplicationStartedEvent; import org.springframework.context.ApplicationListener; import org.springframework.core.Ordered; public class ApplicationStartedEventListener implements ApplicationListener<ApplicationStartedEvent>,Ordered { @Override public void onApplicationEvent(ApplicationStartedEvent ev) { System.out.println("ApplicationStartedEventListener1"); } @Override public int getOrder() { return 1; } }
如果需要有顺序执行，我们可以实现Ordered接口，只越小，越先执行。
package com; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import com.neo.filter.ApplicationStartedEventListener; import com.neo.filter.ApplicationStartedEventListener2; import com.neo.filter.ApplicationStartingEventListener; @SpringBootApplication public class DemoApplication { public static void main(String[] args) { SpringApplication app=new SpringApplication(DemoApplication.class); app.addListeners(new ApplicationStartedEventListener()); app.addListeners(new ApplicationStartingEventListener()); app.addListeners(new ApplicationStartedEventListener2()); app.run(args); } }
标签：执行 ext 过程 star listen package context rri ide
原文地址：https://www.cnblogs.com/yg_zhang/p/9787998.html
