Retrieving a DNS response

To retrieve a response from a DNS request use the Dns#getResponse method passing in a DnsRequest as the argument.  This will return a DnsResponse instance which will contain the response provided by the DNS server.  A DnsResponse may contain one or more DnsRecord.  These records  may be retrieved using the DnsResponse#getAnswers method returning a java.util.Enumeration of DnsRecord. DnsRecord is an abstract class.  In order to get specific information about a DnsRecord you will need to cast it to it's concrete type.

Example

// create new DNS request

DnsRequest request = new DnsRequest("ns1.west.cox.net", "jscape.com");

// set record type to return only MailExchanger records

request.setRecordType(Dns.TYPE_MX);

// create new Dns instance

Dns dns = new Dns();

// get response

DnsResponse response = dns.getResponse(request);

// get records

Enumeration answers = response.getAnswers();

// loop thru all records found

while (answers.hasMoreElements()) {

// get next record                                

 DnsRecord record = (DnsRecord) answers.nextElement();

// if is MailExchanger record then print MX hostname

if (record instanceof MailExchanger) {

 System.out.println("Found MX record: " + ((MailExchanger)record).getMX());

 }

}