在 Web 应用程序中注册 shutdownHook [英] Register shutDownHook in web application

问题描述

我们如何在网络应用程序中注册Shutdown钩子?

How we can registerShutdown hook in web application?

有什么办法可以在 web.xml 或 applicationContext.xml 中注册它?

Is there any whays to register it in web.xml or in applicationContext.xml?

我知道如果我们在主类中使用应用程序，那就很简单了.

I know that if we are using application with main class it's simple.

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
    context.registerShutdownHook();

但是网络应用程序呢?因为它使用 ContextListener

But what about web application? As it uses ContextListener

推荐答案

registerShutdownHook() 在独立(非网络)应用程序中:

@PreDestroy 注释用于 bean 方法，以便在 bean 从上下文中删除或上下文关闭时收到通知.

The @PreDestroy annotation is used on bean method to be notified when the bean is being removed from the context or when the context is shutting down.

关闭事件在 context.close() 或 context.registerShutdownHook() 被调用时触发.

Shut down event is fired when context.close() or context.registerShutdownHook() is invoked.

@Component(value="someBean")
public class SomeBean {

    @PreDestroy
    public void destroy() {
        System.out.println("Im inside destroy...");
    }
}

我希望你已经知道这一点.

I hope you already know this.

网络应用程序中的 registerShutdownHook():

在 Web 应用程序中，DispatcherServlet/ContextListener 创建 ApplicationContext，它会在服务器关闭时关闭上下文.您不需要显式调用context.close()或context.registerShutdownHook().

In a web application, DispatcherServlet/ContextListener creates the ApplicationContext and it will close the context when the server shutdown. You don't need to explicitly invoke context.close() or context.registerShutdownHook().

当服务器关闭时，你的 bean 上的 @PreDestory 方法将被自动通知.

When the server shutdown, @PreDestory methods on your bean will be notified automatically.

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