Example of how to do a dnssd query in Java

jdnssd.java

import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.ldap.InitialLdapContext;

/**
 * Example of how to do a dnssd query in Java.  Code based on answer from:
 * http://stackoverflow.com/questions/738750/querying-the-dns-service-records-to-find-the-hostname-and-tcp-ip
 * @author etsai
 */
public class JDnsSD {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws NamingException {
        DirContext ctx = new InitialLdapContext();
        ctx.addToEnvironment("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
        ctx.addToEnvironment("java.naming.provider.url", "dns:");
        Attributes attrs = (Attributes) ctx.getAttributes(args[0] new String[] { "SRV", "TXT" });
        
        System.out.println(String.format("TXT Record%n==========%n%s", attrs.get("TXT").get(0)));
        
        System.out.println (String.format("%nSRV Records%n==========="));
        String[] propNames= {"priority", "weight", "port", "hostname"};
        for(NamingEnumeration<?> e= attrs.get("SRV").getAll(); e.hasMoreElements();) {
            String values= (String)e.nextElement(), strVal;
            String[] properties= values.split(" ");
            
            strVal= "{";
            for(int i= 0; i < propNames.length; i++) {
                if (i != 0) {
                    strVal+= ", ";
                }
                strVal+= propNames[i] + ": " + (i == propNames.length - 1 ? properties[i].substring(0, properties[i].length()-1) : properties[i]);
            }
            strVal+= "}";
            System.out.println(strVal);
        }
    }
}