You can retrieve the logged in user's name as :
String user=System.getProperty("user.name");
You can retrieve the logged in user detail as described in java-forums.org:
public static void ntSystemDetails() {
com.sun.security.auth.module.NTSystem NTSystem = new com.sun.security.auth.module.NTSystem();
System.out.println(NTSystem.getName());
System.out.println(NTSystem.getDomain());
System.out.println(NTSystem.getDomainSID());
System.out.println(NTSystem.getImpersonationToken());
System.out.println(NTSystem.getPrimaryGroupID());
System.out.println(NTSystem.getUserSID());
for (String group : NTSystem.getGroupIDs()) {
System.out.println("Groups " + group);
}
}
If you get an error like this :
NTSystem is not accessible due to restriction on required library ...
then , follow the following steps as described in https://stackoverflow.com/a/2174607/607637
To know about Well-known security identifiers in Windows operating systems, see this page http://support.microsoft.com/kb/243330
Then
I hope that you get enough hints.