如何从 .properties 文件中读取系统属性

Question

I have a JAVA web application which runs on Tomcat Server. I have a setup a property in my tomcat's VM arguments; something like -Denvironment =“E1”.

I want to read that property inside my app.properties file, I tried mutiple options like ${environment} and {sys:environment} but could not able to read the value.

Please help, thanks in advance.

Answer 1

你也可以试试这个：

${sys:environment}

Answer 2

It all depends on the class you are using to load your properties, because Java dont support this.

If you try with

${sys:environment}

You should use Commons-Configuration

http://commons.apache.org/proper/commons-configuration/