别再用 kill 了，这才是服务上下线的正确姿势！.docx

别再用 kill -9 了，这才是服务上下线的正确姿态！ 基础下线（Spring/SpringBoot/内置容器） 首先JVM本身是支持通过shutdownHook的方式优雅停机的。 Runtime.getRuntime().addShutdownHook(new?Thread()?{????@Override????public?void?run()?{????????close();????}}); 此方式支持在以下几种场景优雅停机: 程序正常退出 使用System.exit() 终端使用Ctrl+C 使用Kill pid干掉进程 那么假如你偏偏要kill -9 程序确定是不知所措的。 而在Springboot中，其实已经帮你实现好了一个shutdownHook，支持响应Ctrl+c或者kill -15 TERM信号。 任凭启动一个应用，然后Ctrl+c一下，观看日志就可知， 它在 AnnotationConfigEmbeddedWebApplicationContext 这个类中打印出了疑似Closing...的日志，真正的实现规律在其父类 AbstractApplicationContext 中(这个其实是spring中的类，意味着什么呢，在spring中就支持了对优雅停机的扩展)。 public?void?registerShutdownHook()?{????if?(this.shutdownHook?==?null)?{????????this.shutdownHook?=?new?Thread()?{????????????public?void?run()?{????????????????synchronized(AbstractApplicationContext.this.startupShutdownMonitor)?{????????????????????AbstractApplicationContext.this.doClose();????????????????}????????????}????????};????????Runtime.getRuntime().addShutdownHook(this.shutdownHook);????}?}?public?void?destroy()?{????this.close();}?public?void?close()?{????Object?var1?=?this.startupShutdownMonitor;????synchronized(this.startupShutdownMonitor)?{????????this.doClose();????????if?(this.shutdownHook?!=?null)?{????????????try?{????????????????Runtime.getRuntime().removeShutdownHook(this.shutdownHook);????????????}?catch?(IllegalStateException?var4)?{????????????????;????????????}????????}?????}}?protected?void?doClose()?{????if?(this.active.get()?&&?pareAndSet(false,?true))?{????????if?(this.logger.isInfoEnabled())?{????????????("Closing?"?+?this);????????}?????????LiveBeansView.unregisterApplicationContext(this);?????????try?{????????????this.publishEvent((ApplicationEvent)(new?ContextClosedEvent(this)));????????}?catch?(Throwable?var3)?{????????????this.logger.warn("Exception?thrown?from?ApplicationListener?handling?ContextClosedEvent",?var3);????????}?????????if?(this.lifecycleProcessor?!=?null)?{????????????try?{????????????????this.lifecycleProcessor.onC