SpringBoot监听程序的启动、停止事件的方法

程序开发时，一般需要在程序启动后执行一段初始化的逻辑，在程序停止之前，执行一段“优雅终止”的逻辑。如下示例演示了在SpringBoot应用中，如何使程序在启动后或者停止前执行指定的逻辑。

1. pom.xml文件如下：

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>syb</groupId>
<artifactId>test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>testpid</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

2. 程序启动事件监听器，代码如下：

package syb.test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;

public class StartListener implements ApplicationListener<ContextRefreshedEvent> {
private Logger logger = LoggerFactory.getLogger(getClass());

@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
logger.info("程序启动");
}

}

3. 程序停止事件监听器，代码如下：

package syb.test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;

public class CloseListener implements ApplicationListener<ContextClosedEvent> {
private Logger logger = LoggerFactory.getLogger(getClass());
@Override
public void onApplicationEvent(ContextClosedEvent event) {
logger.info("程序停止");
}
}

4. 启动引导类代码如下，此处需要将前面的两个监听器添加到SpingApplication对象中：

ge syb.test; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication sa = new SpringApplication(App.class); sa.addListeners(new StartListener()); sa.addListeners(new CloseListener()); sa.run(args); } }

5. 将程序打包，上传至linux系统，启动程序，可以看到打印“程序启动”，使用kill命令终止程序，可以看到打印“程序停止”。