Fully qualified machine name Java with /etc/hosts

Question

I am trying get the fully qualified name of my machine (Windows 7 x64) in Java. On my machine, I've updated the c:\Windows\system32\drivers\etc\hosts file such that it has an entry like this:

10.44.2.167 myserver myserver.domain.com

All our systems have an entry in the \etc\hosts file (in the above format) which I cannot change.

The following code always returns "myserver" and I am never able to get the fully qualified name.

InetAddress addr = InetAddress.getLocalHost();
String fqName = addr.getCanonicalHostName();

How do I achieve this in Java?

Thanks,

Shreyas

score 2 · Answer 1 · answered May 18 '11 at 18:24

2

A quick and dirty way to do this:

try {
InetAddress addr = InetAddress.getLocalHost();

// Get IP Address
byte[] ipAddr = addr.getAddress();

// Get hostname
String hostname = addr.getHostName();
} catch (UnknownHostException e) {
}

answered May 18 '11 at 18:24

Kyle

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on my machine this still returns the short name. – Shreyas Shinde May 18 '11 at 18:32
3

Try [this link](http://download.oracle.com/javase/1.4.2/docs/api/java/net/InetAddress.html#getCanonicalHostName()) to retrieve the fully qualified host name by calling getCanonicalHostName() – Kyle May 18 '11 at 18:37
getCanonicalHostName() is what I am using but it does not work in my case because of my etc/hosts file. – Shreyas Shinde May 18 '11 at 18:57
Have you tried encapsulating `myserver myserver.domain.com` in quotes? – Kyle May 18 '11 at 19:36
This provides only the primary name, not any alias. – pxcv7r Aug 20 '20 at 05:45

score 2 · Answer 2 · answered Feb 15 '12 at 20:37

from 'man hosts ' /etc/hosts (or windows equivalent) has the following format:

ip_address  fully_qualified_name   aliases

so in your case, hosts file would look like:

10.44.2.167 myserver.domain.com   myserver another_alias

When Java does host lookup, if /etc/hosts has an entry, it will grab the first host_name (not the alias)

Fully qualified machine name Java with /etc/hosts

2 Answers2

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