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<TITLE>Getting the Login Name of the Currently Logged-In User (Java Developers Almanac Example)
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<A HREF="/">Home</A>
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    <A HREF="../index.html">List of Packages</A>
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    <B><A HREF="../javax.security.auth.login/pkg.html">javax.security.auth.login</A></B><font color="#666666" class="xsmall-font">
        &nbsp;[3 examples]
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  <h3>e508. Getting the Login Name of the Currently Logged-In User</h3>

This example retrieves the login name of the user that is running the
application.


<pre>    try {
        String loginAppName = <font color="#0066ff"><i>"GetLoginNameUnix"</i></font>;
    
        // If the application is run on NT rather than Unix, use this name
        loginAppName = <font color="#0066ff"><i>"GetLoginNameNT"</i></font>;
    
        // Create login context
        LoginContext lc = new LoginContext(loginAppName,
            new com.sun.security.auth.callback.TextCallbackHandler());
    
        // Retrieve the information on the logged-in user
        lc.login();
    
        // Get the authenticated subject
        Subject subject = lc.getSubject();
    
        // Get the subject principals
        Principal principals[] = (Principal[])subject.getPrincipals().toArray(new Principal[0]);
        for (int i=0; i&lt;principals.length; i++) {
            if (principals[i] instanceof com.sun.security.auth.NTUserPrincipal
                  || principals[i] instanceof com.sun.security.auth.UnixPrincipal) {
                String loggedInUserName = principals[i].getName();
            }
        }
    } catch (LoginException e) {
        // Login failed
    }
</pre>
The example requires a login configuration file that specifies the login
modules to execute when using a particular login-app name.
This configuration file specifies two login-app names:

<pre>    GetLoginNameNT {
        com.sun.security.auth.module.NTLoginModule required;
    };
    
    GetLoginNameUnix {
        com.sun.security.auth.module.UnixLoginModule required;
    };
</pre>
The login configuration file is specified at the command line:

<pre>    &gt; java -Djava.security.auth.login.config=<font color="#0066ff"><i>myconfig.config</i></font> <font color="#0066ff"><i>MyApp</i></font>

</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e507. <a class="eglink" href="ListAppNames.html?l=rel">
    Listing the Login Modules of an Entry in the Current Login Configuration
</a>
<br>

e509. <a class="eglink" href="HandleCb.html?l=rel">
    Handling the Callbacks from a Login Module
</a>
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