DNSJavaNameService

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com.buzzsurf.dns
Class DNSJavaNameService

java.lang.Object
  |
  +--com.buzzsurf.dns.DNSJavaNameService

All Implemented Interfaces:: sun.net.spi.nameservice.NameService

public class DNSJavaNameService
extends java.lang.Object
implements sun.net.spi.nameservice.NameService

This class implements a Name Service Provider, which Java can use (starting with version 1.4), to perform DNS resolutions instead of using standard native calls. Doing your own name resolutions was possible before Java 1.4, but it required custom code, and you couldn't use it in the URLConnection classes because they provide no access to the underlying socket.
This Name Service Provider uses the dnsjava package (http://www.xbill.org/dnsjava).

Important: To use this service, you must set the following system property:

sun.net.spi.nameservice.provider.1=dns,dnsjava

The following system properties are optional and effect performance of the dns resolver:

sun.net.spi.nameservice.nameservers= Set this property to specify your name servers. (If you do not set it, dnsjava will attempt to determine your name servers itself. It isn't always successful, so it's a good idea to set this property!!)
dnsjava.load.balance= Default: false. If true, dnsjava will query your list of DNS server in a round-robin fashion
dnsjava.use.tcp= Default: false. If true, dnsjava will communicate with your DNS server using TCP insead of UDP.
dnsjava.timeout= Default: 20. The time in seconds to wait for a resoponse before giving up.
dnsjava.retries= Default: 3. The number of times to attempt to contact the DNS server before giving up.

Version:: 0.9
Author:: Paul Cowan (pwc21@yahoo.com)

Field Summary

protected org.xbill.DNS.ExtendedResolver resolver


Constructor Summary

protected DNSJavaNameService()
          Constructor for DNSJavaNameService.

Method Summary

java.lang.String getHostByAddr(byte[] ip)
          Finds PTR records (reverse dns lookups) for the ip address

byte[][] lookupAllHostAddr(java.lang.String name)
          Finds A records (ip addresses) for the host name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

resolver

protected org.xbill.DNS.ExtendedResolver resolver

Constructor Detail