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javaurlconnection

How to make sure URLConnection is valid and will successfully connect in Java?

how can you ensure URL you receive from users is a valid url and not just a http://nothing.com

my code looks like this:

String urlFromUser = getUrlFromUser(); // might return: http://www.notARealSite.com
URL url = new URL(urlFromUser);

// this might fail
URLConnection urlConnection = url.openConnection();

and try catch is not enough, i want to make sure the site is real

Solution

  • you can also use:

    if(new InetSocketAddress(urlFromUser, 80).isUnresolved()) {
    // URL is a not a valid server address
}
else {
    // URL is valid
}