Question

How to write a java program which will tell me whether I have internet access or not. I donot want to ping or create connection with some external url because if that server will be down then my program will not work. I want reliable way to detect which will tell me 100% guarantee that whether I have internet connection or not irrespective of my Operating System. I want the program for the computers who are directly connected to internet.

I have tried with the below program

URL url = new URL("http://www.xyz.com/");           
        URLConnection conn = url.openConnection();
        conn.connect();

I want something more appropriate than this program

Thanks
Sunil Kumar Sahoo

Answer 1

It depends on what you mean by “internet” connection. Many computers are not connected directly to the internet, so even if you could check whether they have a network connection, it doesn’t always mean they can access the internet.

The only 100% reliable way to test whether the computer can access some other server is to actually try.