关于java:还在使用kill-9-pid结束spring-boot项目吗那你太落后了

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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（这段话来自菜鸟教程）。

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";
    }
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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
12

启动我的项目

sudo mvn spring-boot:run
1

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
1


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
1

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
1

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]

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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();}
}
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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) {}}

        }
    }
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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，他也登程了线程的 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>

12345

application.yml

server:
  port: 9988

management:
  endpoints:
    web:
      exposure:
        include: shutdown
  endpoint:
    shutdown:
      enabled: true
  server:
    port: 8888
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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";
    }
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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();
            }
        }

    }
}

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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;
    }
}

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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。。。。。。。。。。。");
    }
}
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咱们再来测试而后打印控制台日志：

作者：流星 007

起源：https://blog.csdn.net/qq_3322…

题目：还在应用 kill -9 pid 完结 spring boot 我的项目吗？无妨试试这几种优雅的形式！

近期热文举荐：
SpringCloud 微服务电商我的项目教程

正文完
java
发表至： java
2021-01-12
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