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Rev | Author | Line No. | Line |
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4 | daniel-mar | 1 | package com.dominicsayers.isemail; |
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3 | import java.util.Hashtable; |
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4 | import javax.naming.*; |
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5 | import javax.naming.directory.*; |
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6 | |||
13 | daniel-mar | 7 | /** |
8 | * This class performs DNS lookups. |
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9 | * |
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10 | * @author Rgagnon.com and Daniel Marschall |
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11 | * @see Source: http://www.rgagnon.com/javadetails/java-0452.html (Modified) |
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12 | * @version 2010-06-14 |
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13 | */ |
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4 | daniel-mar | 14 | public class DNSLookup { |
15 | public static int doLookup(String hostName, DNSType type) |
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16 | throws NamingException { |
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17 | Hashtable<String, String> env = new Hashtable<String, String>(); |
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18 | env.put("java.naming.factory.initial", |
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19 | "com.sun.jndi.dns.DnsContextFactory"); |
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20 | DirContext ictx = new InitialDirContext(env); |
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21 | Attributes attrs = ictx.getAttributes(hostName, new String[] { type |
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22 | .toString() }); |
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23 | Attribute attr = attrs.get(type.toString()); |
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24 | if (attr == null) { |
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25 | return 0; |
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26 | } |
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27 | return attr.size(); |
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28 | } |
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29 | |||
30 | private DNSLookup() { |
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31 | } |
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32 | } |