服务器spring boot版本，平滑升级

1、在pom文件中加入:

<!--平滑升级包 开始 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--平滑升级包 结束 -->

2、在spring配置文件中：

#平滑关闭配置开始
management.endpoint.shutdown.enabled=true
management.endpoints.web.exposure.include=*
#平滑关闭配置结束

3、定制controller

import org.apache.catalina.connector.Connector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ContextClosedEvent;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
* 定制的 Connector(tomcat处理器)
*
*/
@Configuration
public class CustomShutdown implements TomcatConnectorCustomizer, ApplicationListener<ContextClosedEvent> {

protected final Logger logger = LoggerFactory.getLogger(this.getClass());

private static final int TIMEOUT = 30;

private volatile Connector connector;

@Override
public void onApplicationEvent(ContextClosedEvent event) {
this.connector.pause();
Executor executor = this.connector.getProtocolHandler().getExecutor();
if (executor instanceof ThreadPoolExecutor) {
try {
logger.warn("WEB 应用准备关闭");
ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) executor;
threadPoolExecutor.shutdown();
if (!threadPoolExecutor.awaitTermination(TIMEOUT, TimeUnit.SECONDS)) {
logger.warn("WEB 应用等待关闭超过最大时长 " + TIMEOUT + " 秒，将进行强制关闭!");
threadPoolExecutor.shutdownNow();
if (!threadPoolExecutor.awaitTermination(TIMEOUT, TimeUnit.SECONDS)) {
logger.error("WEB 应用关闭失败!");
}
}
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}

@Override
public void customize(Connector connector) {
this.connector = connector;
}
}

4、在spring启动类中加入

@Bean
public CustomShutdown customShutdown() {
return new CustomShutdown();
}

/**
* 将定制的添加到tomcat
* @param customShutdown
* @return
*/
@Bean
public ConfigurableServletWebServerFactory webServerFactory(CustomShutdown customShutdown) {
TomcatServletWebServerFactory tomcatServletWebServerFactory = new TomcatServletWebServerFactory();
tomcatServletWebServerFactory.addConnectorCustomizers(customShutdown);
return tomcatServletWebServerFactory;
}

完成