Sending an IP address to a ServerSocket without name resolution?

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nooneinparticular314159@yahoo.com - 02 Mar 2006 12:18 GMT

I am writing a simulation which needs to maintain a table that maps
host names to IP addresses. Because I will be connecting to simulated
hosts, the hostnames do not exist in DNS. I will, however, be
connecting to real hosts. I need a way to create a ServerSocket that
connects to my choice of IP address. But ServerSocket only takes
InetAddress objects, and those don't provide a way to set the IP
address. Is there a way to do this?

Thanks,
Michael

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Thomas Weidenfeller - 02 Mar 2006 12:23 GMT

> I am writing a simulation which needs to maintain a table that maps
> host names to IP addresses. Because I will be connecting to simulated
[quoted text clipped - 3 lines]
> InetAddress objects, and those don't provide a way to set the IP
> address.

Wrong. Please see the API documentation of InetAddress.getByAddress(byte[]).

/Thomas

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nooneinparticular314159@yahoo.com - 02 Mar 2006 12:46 GMT

Thanks! I didn't see that. So do I need to create a string:

a.b.c.d

including the "."s, and convert that into a Byte Array? Or does it
expect the IP without the .'s?

Thanks,
Michael

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Gordon Beaton - 02 Mar 2006 12:49 GMT

> Thanks! I didn't see that. So do I need to create a string:
>
> a.b.c.d
>
> including the "."s, and convert that into a Byte Array? Or does it
> expect the IP without the .'s?

Just create a string containing the IP address:

Socket s = new Socket("192.168.141.29", 80);

/gordon

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nooneinparticular314159@yahoo.com - 02 Mar 2006 14:07 GMT

Hi, Gordon. I tried a version of this earlier. It didn't work - I
think it tried to use the IP address in quotes as a hostname, and
failed to look up the hostname, of course.

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Gordon Beaton - 02 Mar 2006 16:24 GMT

> Hi, Gordon. I tried a version of this earlier. It didn't work - I
> think it tried to use the IP address in quotes as a hostname, and
> failed to look up the hostname, of course.

The Socket constructor passes the host String to
InetAddress.getByName(), which does not attempt to look up literal IP
addresses. It simply checks that the format is correct before creating
an InetAddress() from the String.

/gordon

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Sending an IP address to a ServerSocket without name resolution?

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