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How to check if internet connection is present in Java?

Asked 2009-09-09T20:49:01.450
75

How do you check if you can connect to the internet via java? One way would be:

final URL url = new URL("http://www.google.com");
final URLConnection conn = url.openConnection();
... if we got here, we should have net ...

But is there something more appropriate to perform that task, especially if you need to do consecutive checks very often and a loss of internet connection is highly probable?

java network-programming connection
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This code:

"127.0.0.1".equals(InetAddress.getLocalHost().getHostAddress().toString());

Returns - to me - true if offline, and false, otherwise. (well, I don't know if this true to all computers).

This works much faster than the other approaches, up here.

EDIT: I found this only working, if the "flip switch" (on a laptop), or some other system-defined option, for the internet connection, is off. That's, the system itself knows not to look for any IP addresses.

answered 2012-12-12T07:31:23.930

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