共计 20374 个字符，预计需要花费 51 分钟才能阅读完成。
kill -9 pid？？？
kill 可将指定的信息送至程序。预设的信息为 SIGTERM(15)，可将指定程序终止。若仍无奈终止该程序，可应用 SIGKILL(9) 信息尝试强制删除程序。程序或工作的编号可利用 ps 指令或 jobs 指令查看。
讲的这个简单，简略点来说就是用来杀死 linux 中的过程，啥？你问我啥是过程？请自行百度。
我置信很多人都用过 kill -9 pid 这个命令，彻底杀死过程的意思，个别状况咱们应用它没有下面问题，然而在咱们我的项目中应用它就有可能存在致命的问题。
kill -9 pid 带来的问题
因为 kill -9 属于暴力删除，所以会给程序带来比较严重的结果，那到底会带来什么结果呢？
举个栗子：转账性能，再给两个账户进行加钱扣钱的时候忽然断电了？这个时候会产生什么事件？对于 InnoDB 存储引擎来说，没有什么损失，因为它反对事务，然而对于 MyISAM 引擎来说那几乎就是劫难，为什么？如果给 A 账户扣了钱，当初须要将 B 账户加钱，这个时候停电了，就会造成，A 的钱被扣了，然而 B 没有拿到这笔钱，这在生产环境是相对不容许的，kill -9 相当于忽然断电的成果。
当然了，像转账这种，必定不是应用 MyISAM 引擎，然而现在分布式火了起来，跨服务转账曾经是很平时的事件，这种时候如果应用 kill -9 去进行服务，那就不是你的事务能保证数据的准确性了，这个时候你可能会想到分布式事务，这个世界上没有相对的平安零碎或者架构，分布式事务也是一样，他也会存在问题，概率很小，如果一旦产生，损失有可能是无法弥补的，所以肯定不能应用 kill -9 去进行服务，因为你不晓得他会造成什么结果。
在 MyISAM 引擎中体现的更显著，比方用户的信息由两张表保护，管理员批改用户信息的时候须要批改两张表，但因为你的 kill -9 暴力完结我的项目，导致只批改胜利了一张表，这也会导致数据的不一致性，这是小事，因为大不了再批改一次，然而金钱、合同这些重要的信息如果因为你的暴力删除导致错乱，我感觉可能比删库跑路还重大，至多删库还能复原，你这个都不晓得错在哪里。
那咱们应该怎么完结我的项目呢？
其实 java 给咱们提供了完结我的项目的性能，比方：tomcat 能够应用 shutdown.bat/shutdown.sh 进行优雅完结。
什么叫优雅完结？
第一步：进行接管申请和外部线程。第二步：判断是否有线程正在执行。第三步：期待正在执行的线程执行结束。第四步：进行容器。以上四步才是失常的完结流程，那 springboot 怎么失常完结服务呢？上面我介绍几种失常完结服务的计划，请拿好小本本做好笔记。
优雅完结服务
kill -15 pid
这种形式也会比拟优雅的完结过程（我的项目），应用他的时候须要谨慎，为什么呢？咱们来看个例子
我写了一个一般的 controller 办法做测试
@GetMapping(value = "/test")
public String test(){log.info("test --- start");
try {Thread.sleep(100000);
} catch (InterruptedException e) {e.printStackTrace();
}
log.info("test --- end");
return "test";
}
代码很简略，打印：test — start 之后让让程序休眠 100 秒，而后再打印：test — end，在线程休眠中咱们应用 kill -15 pid 来完结这个过程，你们猜 test — end 会被打印吗？
application.yml
server:
port: 9988
启动我的项目
sudo mvn spring-boot:run
这是 maven 启动 springboot 我的项目的形式
看到这个就代表我的项目启动成了
找到我的项目的过程 id
sudo ps -ef |grep shutdown
这个就是我的项目的过程号，接下来咱们先测试 test 接口，让线程进入休眠状态，而后再应用 kill -15 14086 进行我的项目
sudo curl 127.0.0.1:9988/test
回到我的项目日志
咱们发现申请曾经达到服务，并且线程曾经胜利进入休眠，当初咱们 kill -15 14086 完结过程
sudo kill -15 14086
回到日志
2020-04-24 10:53:14.939 INFO 14086 --- [nio-9988-exec-1] com.ymy.controller.TestController : test --- start
2020-04-24 10:54:02.450 INFO 14086 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at com.ymy.controller.TestController.test(TestController.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:109)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
2020-04-24 10:54:04.574 INFO 14086 --- [nio-9988-exec-1] com.ymy.controller.TestController : test --- end
2020-04-24 10:54:04.610 ERROR 14086 --- [nio-9988-exec-1] o.s.web.servlet.HandlerExecutionChain : HandlerInterceptor.afterCompletion threw exception
java.lang.NullPointerException: null
at org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor.stopLongTaskTimers(LongTaskTimingHandlerInterceptor.java:123) ~[spring-boot-actuator-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.boot.actuate.metrics.web.servlet.LongTaskTimingHandlerInterceptor.afterCompletion(LongTaskTimingHandlerInterceptor.java:79) ~[spring-boot-actuator-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.web.servlet.HandlerExecutionChain.triggerAfterCompletion(HandlerExecutionChain.java:179) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletion(DispatcherServlet.java:1427) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:109) [spring-boot-actuator-2.2.6.RELEASE.jar:2.2.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_242]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_242]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242]
竟然报错了，然而 test — end 是打印进去了，为什么会报错呢？这就和 sleep 这个办法无关了，在线程休眠期间，当调用线程的 interrupt 办法的时候会导致 sleep 抛出异样，这里很显著就是 kill -15 这个命令会让程序马上调用线程的 interrupt 办法，目标是为了让线程进行，尽管让线程进行，但线程什么时候进行还是线程本人说的算，这就是为什么咱们还能看到：test — end 的起因。
ConfigurableApplicationContext colse
咱们先看怎么实现
package com.ymy.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Slf4j
public class TestController implements ApplicationContextAware {
private ApplicationContext context;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.context = applicationContext;}
@GetMapping(value = "/test")
public String test(){log.info("test --- start");
try {Thread.sleep(100000);
} catch (InterruptedException e) {e.printStackTrace();
}
log.info("test --- end");
return "test";
}
/**
* 停机
*/
@PostMapping(value = "shutdown")
public void shutdown(){ConfigurableApplicationContext cyx = (ConfigurableApplicationContext) context;
cyx.close();}
}
重点在：cyx.close();，为什么他能进行 springboot 我的项目呢？请看源码
public void close() {synchronized(this.startupShutdownMonitor) {this.doClose();
if (this.shutdownHook != null) {
try {Runtime.getRuntime().removeShutdownHook(this.shutdownHook);
} catch (IllegalStateException var4) {}}
}
}
程序在启动的时候向 jvm 注册了一个敞开钩子，咱们在执行 colse 办法的时候会删除这个敞开钩子，jvm 就会晓得这是须要进行服务。
咱们看测试后果
很显著，他也触发了线程的 interrupt 办法导致线程报错，原理和 kill -15 差不多。
actuator
这种形式是通过引入依赖的形式进行服务，actuator 提供了很多接口，比方健康检查，根本信息等等，咱们也能够应用他来优雅的停机。
引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
application.yml
server:
port: 9988
management:
endpoints:
web:
exposure:
include: shutdown
endpoint:
shutdown:
enabled: true
server:
port: 8888
我这里对 actuator 的接口从新给定了一个接口，这样可进步安全性，上面咱们来测试一下
@RequestMapping(value = "/test",method = RequestMethod.GET)
public String test(){System.out.println("test --- start");
try {Thread.sleep(10000);
} catch (InterruptedException e) {e.printStackTrace();
}
System.out.println("test --- end");
return "hello";
}
在申请 test 途中进行服务
咱们发现发送进行服务申请之后还给咱们返回了提示信息，很人性化，咱们看看控制台
test — end 被执行了，不过在进行线程池的时候还是调用了线程的 interrupt 办法，导致 sleep 报错，这三种形式都能够比拟优雅的进行 springboot 服务，如果我我的项目中存在线程休眠，我心愿 10 秒当前再进行服务能够吗？必定是能够的，咱们只须要略微做点批改就能够了。
- 1. 新增进行 springboot 服务类：ElegantShutdownConfig.java
package com.ymy.config;
import org.apache.catalina.connector.Connector;
import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class ElegantShutdownConfig implements TomcatConnectorCustomizer, ApplicationListener<ContextClosedEvent> {
private volatile Connector connector;
private final int waitTime = 10;
@Override
public void customize(Connector connector) {this.connector = connector;}
@Override
public void onApplicationEvent(ContextClosedEvent event) {connector.pause();
Executor executor = connector.getProtocolHandler().getExecutor();
if (executor instanceof ThreadPoolExecutor) {
try {ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) executor;
threadPoolExecutor.shutdown();
if (!threadPoolExecutor.awaitTermination(waitTime, TimeUnit.SECONDS)) {System.out.println("请尝试暴力敞开");
}
} catch (InterruptedException ex) {System.out.println("异样了");
Thread.currentThread().interrupt();
}
}
}
}
- 2. 在启动类中退出 bean
package com.ymy;
import com.ymy.config.ElegantShutdownConfig;
import lombok.extern.slf4j.Slf4j;
import org.apache.catalina.connector.Connector;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.event.ContextClosedEvent;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
@SpringBootApplication
public class ShutdownServerApplication {public static void main(String[] args) {ConfigurableApplicationContext run = SpringApplication.run(ShutdownServerApplication.class, args);
run.registerShutdownHook();}
@Bean
public ElegantShutdownConfig elegantShutdownConfig() {return new ElegantShutdownConfig();
}
@Bean
public ServletWebServerFactory servletContainer() {TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
tomcat.addConnectorCustomizers(elegantShutdownConfig());
return tomcat;
}
}
这样咱们就配置好了，咱们再来测试一遍，test 的接口还是休眠 10 秒
咱们发现这次没有报错了，他是期待了一段时间之后再完结的线程池，这个工夫就是咱们在 ElegantShutdownConfig 类中配置的 waitTime。
那可能你会有疑难了，jvm 没有立刻进行，那这个时候在有申请会产生什么呢？如果敞开的时候有新的申请，服务将不在接管此申请。
数据备份操作
如果我想在服务进行的时候做点备份操作啥的，应该怎么做呢？其实很简略在你要执行的办法上增加一个注解即可：@PreDestroy
Destroy：毁灭、覆灭 pre: 前缀缩写
所以合在一起的意思就是在容器进行之前执行一次，你能够在这外面做备份操作，也能够做记录停机工夫等。
新增服务进行备份工具类：DataBackupConfig.java
package com.ymy.config;
import org.springframework.context.annotation.Configuration;
import javax.annotation.PreDestroy;
@Configuration
public class DataBackupConfig {
@PreDestroy
public void backData(){System.out.println("正在备份数据。。。。。。。。。。。");
}
}
咱们再来测试而后打印控制台日志：
起源：https://blog.csdn.net/qq_3322…
正文完
