How can I bind serversocket to specific IP?

Question

If I have a String representing an IP address (IPv4 or IPv6) how can I create a ServerSocket and bind to this IP without caring if the IP passed in, is IPv4 or IPv6?
I see that there is a constructor:ServerSocket(int port, int backlog, InetAddress bindAddr) but InetAddress does not seem to offer any constructors and its subclasses have names specific to IPv4 and IPv6.
So how can I bind the socket to the IP?

score 34 · Accepted Answer · edited Mar 28 '16 at 20:23

34

You can use the factory method INetAddress.getByName. It'll figure out which subclass to use. For example:

InetAddress addr = InetAddress.getByName("127.0.0.1");
// or
InetAddress addr = InetAddress.getByName("::1");

// and now you can pass it to your socket-constructor
ServerSocket sock = new ServerSocket(1234, 50, addr);

edited Mar 28 '16 at 20:23

Jochem

25
7

answered Feb 20 '13 at 09:58

vstm

12,407
1
51
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You mean pass in my IP and get back the object? – Jim Feb 20 '13 at 09:58
@Jim: Yes, exactly! I have added an example on how to use it. – vstm Feb 20 '13 at 10:00
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just a note: The default 'backlog' is 50 :D. – Aug 09 '14 at 10:46
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another note: using `0` as backlog will use the default value – kapex Oct 24 '16 at 13:43
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what is 'back log'? – Eboubaker Dec 01 '19 at 17:43

How can I bind serversocket to specific IP?

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