在运行时设置application.properties

Question

I need to get my.application.dev, my.application.qa or my.application depending on the environment where is running:

I have my application.properties like this:

application.prod=my.application
application.qa=my.application.qa
application.dev=my.application.dev
application.property=${application.${env.name}}

And this is my code:

InputStream input = this.getClass().getClassLoader().getResourceAsStream("application.properties");
// Let's say that I have a environment var to determinate if it's running in dev, qa or prod
// At this point, I do something like this String env = System.getenv("envName");

** What could I do here is to set ${env.name}} with env**

Properties props = new Properties();
props.load(input);
String myValue = props.getProperty("application.property");

Any idea? Thanks

Answer 1

In application.properties just define:

application.prod=my.application
application.qa=my.application.qa
application.dev=my.application.dev

Then read the needed property:

String env = System.getProperty("envName");
try (InputStream input = getClass().getClassLoader().getResourceAsStream("application.properties")) {
  Properties props = new Properties();
  props.load(input);
  String value = props.getProperty("application." + env);
  System.out.println(value);
} catch (IOException ex) {
  ex.printStackTrace();
}