Get LDAP Servers Programmatically

DiscoverLdapServers.java

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.spi.NamingManager;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Hashtable;
import java.util.List;
import java.util.TreeMap;

public class DiscoverLdapServers {
    // Reference: http://stackoverflow.com/questions/3091984/authenticating-from-java-linux-to-active-directory-using-ldap-without-servername
    private static final String[] SRV = new String[] { "SRV" };

    public static Collection<InetSocketAddress> srv(String name) throws NamingException {
        DirContext ctx = new InitialDirContext();

        Attributes attributes = ctx.getAttributes("dns:/" + name, SRV);
        if(attributes.get("SRV") == null)
        {
            return Collections.emptyList();
        }

        NamingEnumeration<?> e = attributes.get("SRV").getAll();

        List<InetSocketAddress> result = new ArrayList<InetSocketAddress>();

        while(e.hasMoreElements()) {
            String line = (String) e.nextElement();

            // The line is priority weight port host
            String[] parts = line.split("\\s+");

            //int prio = Integer.parseInt(parts[0]);
            int port = Integer.parseInt(parts[2]);
            String host = parts[3].substring(0, parts[3].length() - 1);

            result.add(new InetSocketAddress(host, port));
        }

        return result;
    }

    public static void main(String[] args) throws Exception {
        LdapTest test = new LdapTest();
        //  Note that the string contains the environment name.  Would need to substitue
        //  with the respective environment app is running in.
        Collection<InetSocketAddress> srvRecords = test.srv("_ldap._tcp.<domain_name>");

        for (InetSocketAddress srvRecord : srvRecords) {
            System.out.println(srvRecord);
        }
    }
}