runtime.getruntime().addshutdownhook

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void java.lang.Runtime.addShutdownHook(Thread hook)
该方法用来在jvm中增加一个关闭的钩子。当程序正常退出,系统调用 System.exit方法或虚拟机被关闭时才会执行添加的shutdownHook线程。其中shutdownHook是一个已初始化但并不有启动的线程，当jvm关闭的时候，会执行系统中已经设置的所有通过方法addShutdownHook添加的钩子，当系统执行完这些钩子后，jvm才会关闭。所以可通过这些钩子在jvm关闭的时候进行内存清理、资源回收等工作

public static void main(String[] args) {        Runtime.getRuntime().addShutdownHook(new Thread(){            public void run() {                try {                    LOGGER.info("shutdownhook start..." + new Date());                    Thread.currentThread().sleep(5000);                    LOGGER.info("shutdownhook end..." + new Date());                } catch (Exception e){                    e.printStackTrace();                }            }        });        System.exit(1);    }

2017-05-03 10:28:06.364 INFO 38904 — [ Thread-6] c.iccmo.flow.gateway.GatewayApplication : shutdownhook start…Wed May 03 10:28:06 CST 2017
2017-05-03 10:28:06.364 INFO 38904 — [ Thread-5] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@a9cd3b1: startup date [Wed May 03 10:28:01 CST 2017]; root of context hierarchy
2017-05-03 10:28:06.369 INFO 38904 — [ Thread-5] s.b.a.d.e.ElasticsearchAutoConfiguration : Closing Elasticsearch client
2017-05-03 10:28:06.369 INFO 38904 — [ Thread-5] org.elasticsearch.node : [Brain-Child] stopping …
2017-05-03 10:28:06.371 INFO 38904 — [ Thread-5] org.elasticsearch.node : [Brain-Child] stopped
2017-05-03 10:28:06.371 INFO 38904 — [ Thread-5] org.elasticsearch.node : [Brain-Child] closing …
2017-05-03 10:28:06.374 INFO 38904 — [ Thread-5] org.elasticsearch.node : [Brain-Child] closed
2017-05-03 10:28:06.375 INFO 38904 — [ Thread-5] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2017-05-03 10:28:11.366 INFO 38904 — [ Thread-6] c.iccmo.flow.gateway.GatewayApplication : shutdownhook end…Wed May 03 10:28:11 CST 2017

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