如何捕获System.exit事件？ [英] How to capture System.exit event?
问题描述
我在java中有一个应用程序，我试图确保if ifbody在代码中退出代码System.exit（），应该调用一个监听器来做一些事情，如记录消息和释放资源......
I have an application in java, in which i try to ensure that the if anybody exits codes System.exit() in the code , an listener should be called to do some stuff like logging message and releasing the resources ...
我如何实现它，欢迎任何建议/方法。
How can i implement it, any suggestion/approach is welcome.
推荐答案
Runtime.addShutdownHook 方法可以用来添加一个关闭钩子，它基本上是一个未启动的 Thread ，在关闭Java虚拟机时执行。
The Runtime.addShutdownHook method can be used to add a shutdown hook, which is basically a unstarted Thread, which executes on shutdown of the Java Virtual Machine.
然而，这是应谨慎行事的领域，因为它是在JVM的非常敏感的时间执行的。生命周期。来自 Runtime.addShutdownHook 方法的API规范：
However, this is territory that should to be tread carefully, as it is being performed at a very sensitive time of the JVM's life cycle. From the API Specifications for the Runtime.addShutdownHook method:
关闭挂钩运行于虚拟机生命周期
的微妙时间
，因此应该在防御上编码
。它们应该以
特别写成
线程安全，并尽可能避免死锁
。
Shutdown hooks run at a delicate time in the life cycle of a virtual machine and should therefore be coded defensively. They should, in particular, be written to be thread-safe and to avoid deadlocks insofar as possible.
无论如何，请务必仔细阅读关闭钩子如何工作，因为如果没有一些好的准备，可能不应该接近它们。请务必仔细阅读 Runtime.addShutdownHook 方法的API规范。
In any event, be sure to read up a bit on how shutdown hooks work, as they probably should not be approached without some good preparation. Be sure to carefully read the API Specification for the Runtime.addShutdownHook method.
以下是我发现的几篇文章从搜索此答案的信息：
Here's are a couple articles I found from searching for information for this answer:
-
Shutdown Hooks - 它显示了一个关于如何在关机时添加关闭挂钩的示例。
Shutdown Hooks -- it shows a little example of how a shutdown hook is added for logging at shutdown.
设计Shutdown Hooks API - 以问答形式解决关闭挂钩的一些设计决策。
Design of the Shutdown Hooks API -- addresses some design decisions of shutdown hooks in a question and answer style.
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