如何检测Java System属性是否已更改? [英] How to detect if a Java System property has changed?

问题描述

我想知道何时更改系统属性.我在应用程序服务器中有一个应用程序，它某种程度上正在更改系统属性(我认为是System.setProperty()).我看了一下，发现了不同的方法:

I would like to know when a System property is changed. I have an application, in an application server, that somehow is changing a system property (System.setProperty() I think). I was taking a look and I have found different approaches:

1. JPDA?
2. 观察者&可以观察到吗?
3. 属性更改侦听器?
4. JMX?

1. JPDA?
2. Observer & Observable?
3. Property change listener?
4. JMX?

有什么建议吗?预先感谢.

Any suggestions? Thanks in advance.

推荐答案

您可以使用自己的自定义子类替换系统属性.

You can replace the system Properties with your own custom subclass.

MyProperties newProps = new MyProperties(System.getProperties());
System.setProperties(newProps);

然后，只需编写一个Properties的子类，该子类会钩住相关方法.

Then, just write a subclass of Properties which hooks the relevant methods.

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