Java current machine name and logged in user

environmentjava

Is it possible to get the name of the currently logged in user (Windows/Unix) and the hostname of the machine?

I assume it's just a property of some static environment class.

I've found this for the user name

com.sun.security.auth.module.NTSystem NTSystem = new
        com.sun.security.auth.module.NTSystem();
System.out.println(NTSystem.getName());

and this for the machine name:

import java.net.InetAddress;
...
String computerName;
...
try {
    computerName = InetAddress.getLocalHost().getHostName();
}

catch(Exception ex) {
    ...
}

Is the first one just for Windows?

And what will the second one do, if you don't have a hostname set?

Best Solution

To get the currently logged in user:

System.getProperty("user.name"); //platform independent 

and the hostname of the machine:

java.net.InetAddress localMachine = java.net.InetAddress.getLocalHost();
System.out.println("Hostname of local machine: " + localMachine.getHostName());