Spring Boot关闭钩子 [英] Spring Boot shutdown hook
问题描述
如何注册/添加一个自定义关闭例程，该例程将在我的Spring Boot应用程序关闭时触发？
How can I register/add a custom shutdown routine that shall fire when my Spring Boot application shuts down?
场景：我将Spring Boot应用程序部署到Jetty servlet容器（即没有嵌入式Jetty）。我的应用程序使用Logback进行日志记录，我想使用Logback的MBean JMX配置程序在运行时更改日志记录级别。 其文档指出，为了避免内存泄漏，在关闭时必须调用特定的LoggerContext关闭方法。
Scenario: I deploy my Spring Boot application to a Jetty servlet container (i.e., no embedded Jetty). My application uses Logback for logging, and I want to change logging levels during runtime using Logback's MBean JMX configurator. Its documentation states that to avoid memory leaks, on shutdown a specific LoggerContext shutdown method has to be called.
有什么方法可以听取Spring Boot关闭事件？
What are good ways to listen on Spring Boot shutdown events?
我试过：
public static void main(String[] args) throws Exception {
ConfigurableApplicationContext cac = SpringApplication.run(Example.class, args);
cac.addApplicationListener(new ApplicationListener<ContextClosedEvent>() {
@Override
public void onApplicationEvent(ContextClosedEvent event) {
logger.info("Do something");
}
});
}
但是当应用程序关闭时，不会调用此注册的侦听器。
but this registered listener does not get called when the application shuts down.
推荐答案
每个SpringApplication都会向JVM注册一个关闭钩子，以确保在退出时正常关闭ApplicationContext。可以使用所有标准的Spring生命周期回调（例如DisposableBean接口或@PreDestroy注释）。
Each SpringApplication will register a shutdown hook with the JVM to ensure that the ApplicationContext is closed gracefully on exit. All the standard Spring lifecycle callbacks (such as the DisposableBean interface, or the @PreDestroy annotation) can be used.
此外，bean可以实现org.springframework.boot .ExitCodeGenerator接口，如果他们希望在应用程序结束时返回特定的退出代码。
In addition, beans may implement the org.springframework.boot.ExitCodeGenerator interface if they wish to return a specific exit code when the application ends.
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