Spring读取系统属性的方法就是先读system.getProperty() 然后再读 System.getenv()
阅读更多这是整个调用的StacktraceThread[main](Suspended)owns:Object(id=22)PropertyPlaceholderConfigurer.resolveSystemProperty(String)line:358PropertyPlaceholderConfigurer.resolvePlaceholder(String,Properties,int)