public class HostNameUtil extends Object
Constructor and Description |
---|
HostNameUtil() |
Modifier and Type | Method and Description |
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static String |
getLocalHostAddress()
Gets the address for the local machine.
|
static InetAddress |
getLocalHostLANAddress()
Returns an
InetAddress object encapsulating what is most likely the machine's
LAN IP address. |
public HostNameUtil()
public static String getLocalHostAddress() throws UnknownHostException
UnknownHostException
public static InetAddress getLocalHostLANAddress() throws UnknownHostException
InetAddress
object encapsulating what is most likely the machine's
LAN IP address.
This method is intended for use as a replacement of JDK method
InetAddress.getLocalHost
, because that method is ambiguous on Linux systems.
Linux systems enumerate the loopback network interface the same way as regular LAN network
interfaces, but the JDK InetAddress.getLocalHost
method does not specify the
algorithm used to select the address returned under such circumstances, and will often return
the loopback address, which is not valid for network communication. Details here.
This method will scan all IP addresses on all network interfaces on the host machine to determine the IP address most likely to be the machine's LAN address. If the machine has multiple IP addresses, this method will prefer a site-local IP address (e.g. 192.168.x.x or 10.10.x.x, usually IPv4) if the machine has one (and will return the first site-local address if the machine has more than one), but if the machine does not hold a site-local address, this method will return simply the first non-loopback address found (IPv4 or IPv6).
If this method cannot find a non-loopback address using this selection algorithm, it will
fall back to calling and returning the result of JDK method
InetAddress.getLocalHost
.
UnknownHostException
- If the LAN address of the machine cannot be found.Copyright © 2002–2018 The Apache Software Foundation. All rights reserved.