How to use Environment Variable to set file from Java code?

Question

I set environment variable CONFIG. Is it possible to use it to open file?

String path = "$CONFIG/app/users.json" File file = new File(path);

PS

I cannot add whole path to file to the property file. It is required to use $CONFIG variable.

SMA · Accepted Answer · 2015-02-24 09:17:08Z

You could use System class's getenv method like:

String path = System.getenv("CONFIG") + "/app/users.json"

So you could get whatever path you set in CONFIG variable and then you could append further path to it.

Konstantin Yovkov · Accepted Answer · 2015-02-24 09:17:39Z

There a built-in method, System.getenv() which returns a Map with all the environment variables, from which you can get the one you need:

Map<String, String> env = System.getenv(); String config = env.get("CONFIG"); //and then String path = config + "/app/users.json";

2 Answers 2