java 关闭 Spring ApplicationContext
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Closing a Spring ApplicationContext
提问by Scorpio
When I create a new Spring ApplicationContext, for example via
当我创建一个新的 Spring ApplicationContext 时，例如通过
final ApplicationContext ac = new AnnotationConfigApplicationContext(AppConfiguration.class);
Eclipse (STS 3.2.0) will mark it as a potential resource leak, complaining it is never closed ('Resource leak: 'ac' is never closed).
Eclipse (STS 3.2.0) 会将其标记为潜在的资源泄漏，并抱怨它从未关闭（'Resource leak: 'ac' is never closed）。
So far, so good. Then I tried to look into the issue, and was not able to find a close()or shutdown()or similar method that would even allow me to close the ApplicationContext. Is this an Eclipse warning go haywire, intended design or am I missing something?
到现在为止还挺好。然后我试图调查这个问题，但无法找到一个close()或shutdown()或类似的方法，甚至可以让我关闭ApplicationContext. 这是 Eclipse 警告失控、预期设计还是我遗漏了什么？
回答by zagyi
You declare acas ApplicationContextwhich doesn't define a close()method. Instead of that use any super-type of AnnotationConfigApplicationContextthat extends Closeable(e.g. ConfigurableApplicationContext) providing the close()method you need to release all resources.
您声明acas ApplicationContextwhich 没有定义close()方法。而不是使用任何AnnotationConfigApplicationContext扩展的超类型Closeable（例如ConfigurableApplicationContext）提供close()释放所有资源所需的方法。
回答by mkdev
If you use Java 7 you can use the try-with-resources statement to do the work for you
如果您使用 Java 7，您可以使用 try-with-resources 语句为您完成工作
try (AnnotationConfigApplicationContext ac = new AnnotationConfigApplicationContext(...))
{
...
}
回答by Slava Semushin
Yes, interface ApplicationContextdoesn't have close()method, but child classes AbstractApplicationContextand GenericApplicationContexthave close()and destroy(). So, I suggest to use them instead. Also there is useful method registerShutdownHook().
是的，接口ApplicationContext没有close()方法，但子类AbstractApplicationContext，并GenericApplicationContext有close()和destroy()。所以，我建议改用它们。还有有用的方法registerShutdownHook()。
回答by Shimon Doodkin
Downcast your ApplicationContext to ConfigurableApplicationContext which defines close() method:
将您的 ApplicationContext 向下转换为 ConfigurableApplicationContext ，它定义了 close() 方法：
((ConfigurableApplicationContext)appCtx).close();
((ConfigurableApplicationContext)appCtx).close();
