How can I look up a DNS MX record for a given server in Java?

Question

Anybody knows how to get MX address (from for example gmail.com) in java using standard libraries? Or do I need to download external one?

I'm using netbeans if it can be helpful (if it provides something for this).

Blindheim

Does the solution need to be platform independent, and if not, which platform will it run on? – Yore

You can look at this question : #10262495 – Repulsive

Answer 1

I was also searching for standart lib for this in java. Unsuccessful.

Then I have used dnsjava.

private Record[] lookupMxRecords(final String domainPart) throw TextParseException
{
    final Lookup dnsLookup = new Lookup(domainPart, Type.MX);
    return dnsLookup.run();
}

Widespread

Answer 2

Main.java

import java.util.Enumeration;
import java.util.Hashtable;

import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;

public class Main {
    public static void main(String args[]) throws Exception {
        Hashtable<String, String> env = new Hashtable<String, String>();
        env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
        env.put("java.naming.provider.url", "dns://8.8.8.8/");
        DirContext ctx = new InitialDirContext(env);
        Attributes attrsl = ctx.getAttributes("google.com", new String[] {"MX"});
        Attribute attr = attrsl.get("MX");
        if (attr != null) {
            System.out.println("MX records:");
            for (Enumeration vals = attr.getAll(); vals.hasMoreElements();) {
                System.out.println(vals.nextElement());
            }
        }
    }
}

issues

$ javac Main.java && java Main
MX records:
20 alt1.aspmx.l.google.com.
50 alt4.aspmx.l.google.com.
10 aspmx.l.google.com.
40 alt3.aspmx.l.google.com.
30 alt2.aspmx.l.google.com.

Wisent