问题描述
在Spring的applicationcontext.xml文件中使用＃{systemProperties ['environment']}是否返回与环境相关的值？
Does using #{systemProperties['environment']} in the applicationcontext.xml file of Spring return the value associated with environment?
或者有没有办法ge春天applicationcontext.xml文件中的系统变量值。
Or is there any way to ge the system variable value in the spring applicationcontext.xml file.
推荐答案
您可以通过不同方式访问系统属性：
You can access the system properties in different ways:
-
＃{systemProperties ['databaseName']} -
＃{systemProperties.databaseName} -
$ {databaseName}// $而不是＃!!
#{systemProperties['databaseName']}#{systemProperties.databaseName}${databaseName}//$ instead of # !!
With #{systemProperties.databaseName} you have access to the system properties readed for example from the command line (-DdatabaseName="testDB").
使用 $ {databaseName} ，您可以访问属性中的属性例如，由PropertyPlaceholderConfigurer 加载并提供给系统专业的文件
With ${databaseName} you have access the the properties from the properties files loaded and provided for example by the PropertyPlaceholderConfigurer and to the system prooperties too
@Value("#{systemProperties['java.version']}")
private String javaVersionMap;
//Dont know how
//@Value("#{systemProperties.javav.version}")
//private String javaVersionDirect;
@Value("${java.version}")
private String javaVersionProp;
//-DcmdParam=helloWorld
@Value("#{systemProperties['cmdParam']}")
private String cmdParamMap;
@Value("#{systemProperties.cmdParam}")
private String cmdParamDirect;
@Value("${cmdParam}")
private String cmdParamProp
您可以在 @Value 注释或config.xml文件（< property name =databaseName值）中使用所有这些注释=＃{systemProperties.databaseName}/> ）
You can use all of them in a @Value annotation or the config.xml files (<property name="databaseName" value="#{systemProperties.databaseName}"/>)
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