使用占位符将系统环境变量注入 Spring Annotation

Question

I know you can inject environment variables with the @Value annotation like this

    @Value("#{systemEnvironment['AWS_ENV']}")
    private String envTarget;

If I am using a Spring annotation however can I inject the environment variable in-line into the String value? For example something like this:

@PropertySource("classpath:secrets-${#{systemEnvironment['AWS_ENV']}.properties")

Obviously the above doesn't work as it tries to resolve systemEnvironment['AWS_ENV'] as a jvm property. Anyone have any ideas?

Answer 1

The placeholder could be moved to a single aws.properties file:

aws.properties 
envTarget = ${AWS_ENV}

then:

@PropertySource("classpath:aws.properties")

For local development, the placeholder can be added as JVM parameters in the run configuration, but that can become a pain to manage. An alternative would be to have a aws-local.properties (located in same resources folder), but this file is in .gitignore so secrets are never committed. Then there is a single JVM parameter to use the local profile .

Answer 2

While the accepted answer did partially solve my problem I ended up just manually configuring the Properties without using the PropertySource annotation. This allowed me to have better control over the bean lifecycles and the property file to load.

Spring Environment Property Source Configuration