以编程方式访问由属性占位符创建的属性 [英] Programmatic access to properties created by property-placeholder

问题描述

我正在使用context:property-placeholder读取属性文件.如何以编程方式访问它们(@Value不起作用-开发时我不知道产权)?

I'm reading properties file using context:property-placeholder. How can I access them programatically (@Value doesn't work - I don't know property titles at the moment of developing)?

主要问题是我无法更改applicationContext.xml文件，因为它是由父"框架设置的

The main problem is I can't change applicationContext.xml file because it's setted up by "parent" framework

ps.很奇怪，但是Environment.getProperty返回null

ps. It's strange but Environment.getProperty returns null

推荐答案

不，您不能. PropertyPlaceholderConfigurer是 BeanFactoryPostProcessor ，在bean创建过程中它仅是活动的".遇到${property}表示法时，它将尝试根据其内部属性来解决该问题，但不会使这些属性可用于容器.

No you can't. PropertyPlaceholderConfigurer is a BeanFactoryPostProcessor, it is only "alive" during bean creation. When it encounters a ${property} notation, it tries to resolve that against its internal properties, but it does not make these properties available to the container.

那是说:类似的问题一次又一次地出现，提出的解决方案通常是子类化PropertyPlaceHolderConfigurer 并使手动可用于上下文的属性.或使用PropertiesFactoryBean

That said: similar questions have appeared again and again, the proposed solution is usually to subclass PropertyPlaceHolderConfigurer and make the Properties available to the context manually. Or use a PropertiesFactoryBean

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