<dependency><groupId>dnsjava</groupId><artifactId>dnsjava</artifactId><version>2.1.7</version>
</dependency>
<dependency><groupId>commons-net</groupId><artifactId>commons-net</artifactId><version>2.0</version>
</dependency>

import com.google.common.collect.Lists;
import org.xbill.DNS.*;
import java.util.ArrayList;
import java.util.List;
public class DNSUtil {class DNSType{public static final int MX=1;public static final int A=2;}public static List<String> dnsALookup(final String adr){List<String> list= Lists.newArrayList();try {final Lookup lookup = new Lookup(adr, Type.A);lookup.setResolver(new SimpleResolver());lookup.setCache(null);final Record[] records = lookup.run();if (lookup.getResult() == Lookup.SUCCESSFUL)for (final Record record : records) {if (record instanceof ARecord) {final ARecord ptr = (ARecord) record;list.add(ptr.getAddress().getHostAddress().toString());}}}catch (Exception e){e.printStackTrace();}return list;}public static List<String> mxByDomain(String host){try {DnsThread dnsThread=new DnsThread(host,DNSType.MX);dnsThread.start();dnsThread.join(5000);List<String> dnsList=dnsThread.getDnsList();return dnsList;} catch (Exception e) {return new ArrayList();}}public static List<String> reverseDNSLookup(final String adr){List<String> list= Lists.newArrayList();try {final Lookup lookup = new Lookup(adr, Type.MX);lookup.setResolver(new SimpleResolver());lookup.setCache(null);final Record[] records = lookup.run();if (lookup.getResult() == Lookup.SUCCESSFUL)for (final Record record : records) {if (record instanceof MXRecord) {final MXRecord ptr = (MXRecord) record;list.add(ptr.getTarget().toString());}}}catch (Exception e){e.printStackTrace();}return list;}public static class DnsThread extends Thread {private List<String> dnsList = new ArrayList();private String host = "";private int type=0;DnsThread(String host,int type) {this.host = host;this.type=type;}@Overridepublic void run() {lookup(host);}public void lookup(String host) {try {if(type==DNSType.MX)this.dnsList = reverseDNSLookup(host);if(type==DNSType.A)this.dnsList = dnsALookup(host);} catch (Exception e) {}}public List<String> getDnsList() {return dnsList;}public void setDnsList(List<String> dnsList) {this.dnsList = dnsList;}}public static void main(String[] args) {System.out.println(DNSUtil.dnsALookup("qq.com"));System.out.println(DNSUtil.mxByDomain("qq.com"));}}

package com.lyn.util;import org.xbill.DNS.*;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.InitialDirContext;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;public class DNSUtils{public static final Long TIMEOUT=3000l;class DNSType{public static final int MX=1;public static final int A=2;}public static List<String> mxByDomain(String host){try {long a=System.currentTimeMillis();DnsThread dnsThread=new DnsThread(host,DNSType.MX);dnsThread.start();dnsThread.join(TIMEOUT);long b=System.currentTimeMillis();List<String> dnsList=dnsThread.getDnsList();System.out.println(host+"耗时"+Double.valueOf((b-a)/1000)+"s");return dnsList;} catch (Exception e) {return new ArrayList<>();}}public static List<String> aByDomain(String host){try {long a=System.currentTimeMillis();DnsThread dnsThread=new DnsThread(host,DNSType.A);dnsThread.start();dnsThread.join(TIMEOUT);long b=System.currentTimeMillis();List<String> dnsList=dnsThread.getDnsList();
//            System.out.println(host+"DNS检测耗时"+Double.valueOf((b-a)/1000)+"s");return dnsList;} catch (Exception e) {return new ArrayList<>();}}public static List<String> reverseDNSLookup(final String adr) throws Exception{List<String> resultList=searchDNSList(adr);if(resultList.size()>0){return resultList;}List<String> list= new ArrayList<>();final Lookup lookup = new Lookup(adr, Type.MX);lookup.setResolver(new SimpleResolver());lookup.setCache(null);final Record[] records = lookup.run();if (lookup.getResult() == Lookup.SUCCESSFUL)for (final Record record : records) {if (record instanceof MXRecord) {final MXRecord ptr = (MXRecord) record;list.add(ptr.getTarget().toString());}}return list;}/*** @param address 查询地址* @return*/public static List<String> searchDNSList(String address) {InitialDirContext context = null;String serverAddr="202.106.0.20";List<String> resultList = new ArrayList<String>();try {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://" + serverAddr + "/");env.put("com.sun.jndi.ldap.read.timeout", "5000");context = new InitialDirContext(env);String dns_attrs[] = { "MX" };Attributes attrs = context.getAttributes(address, dns_attrs);Attribute attr = attrs.get("MX");if (attr != null) {for (int i = 0; i < attr.size(); i++) {String str=(String) attr.get(i);if(str.indexOf(" ")!=-1)resultList.add(str.split(" ")[1]);elseresultList.add(str);}}} catch (Exception e) {e.printStackTrace();} finally {if(context!=null){try {context.close();} catch (NamingException e) {}}}return resultList;}public static List<String> dnsALookup(final String adr) throws Exception{List<String> list= new ArrayList<>();final Lookup lookup = new Lookup(adr, Type.A);lookup.setResolver(new SimpleResolver());lookup.setCache(null);final Record[] records = lookup.run();if (lookup.getResult() == Lookup.SUCCESSFUL) {for (final Record record : records) {if (record instanceof ARecord) {final ARecord ptr = (ARecord) record;list.add(ptr.getAddress().getHostAddress().toString());}}}return list;}public static class DnsThread extends Thread {private List<String> dnsList = new ArrayList<>();private String host = "";private int type=0;DnsThread(String host,int type) {this.host = host;this.type=type;}@Overridepublic void run() {lookup(host);}public void lookup(String host) {try {if(type==DNSType.MX)this.dnsList = reverseDNSLookup(host);if(type==DNSType.A)this.dnsList = dnsALookup(host);} catch (Exception e) {}}public List<String> getDnsList() {return dnsList;}public void setDnsList(List<String> dnsList) {this.dnsList = dnsList;}}public static void main(String[] args){String[] domain=new String[]{"gmail.com","xinnet.com","wo.cn","138.com"};for(String ss: domain) {List<String> list = DNSUtils.mxByDomain(ss);System.out.println("得到Mx length:"+list.size());System.out.println("得到Mx:"+ JSONUtils.obj2json(list));}//        long a=System.currentTimeMillis();
//         System.out.println(DNSUtils.mxByDomain("gmail.com"));
//        long b=System.currentTimeMillis();
//        System.out.println(b-a);
//        String domain=DNSUtils.mxByDomain("gmail.com").get(0);
//        System.out.println(DNSUtils.mxByDomain("xinnet.com"));
//        long c=System.currentTimeMillis();
//        System.out.println(c-b);
//        System.out.println(DNSUtils.aByDomain(domain));
//        long d=System.currentTimeMillis();
//        System.out.println(d-c);
//        long a=System.currentTimeMillis();
//        try {
//            System.out.println(DNSUtils.reverseDNSLookup("189.cn"));
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//        System.out.println(System.currentTimeMillis()-a);
//        try {
//           List ip= DNSUtils.mxByDomain("qq");
//            System.out.println(ip);
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
    }
}