Java beginner

TarfHead

I attending a foundation level course for Java and am working on a networking assignment.

The brief, at a high level, is to take a given URL and identify all links specified in the html. For each of those links, check if they're still valid, or broken.

I've hit a problem on one of the links, www.irishurls.com. When I access this with Chrome, it returns an error

The server at www.irishurls.com can't be found, because the DNS lookup failed.

.

My code is ;

HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setConnectTimeout(3000);
c.setReadTimeout(3000);
System.out.println(c.getResponseCode());

When I run the code, in Eclipse, the console display just 'hangs' for this URL, i.e. the print statement is not shown in the console display, nor are any subsequent print statements. I assume this is because I do not have the correct handling in place for whatever is the outcome of the openConnection() command.

Any suggestions ? FWIW the Timeout settings were added more in desperation than design.

Thanks

duffman85

Are you sure this is the correct address and not just an example?

It's hanging because DNS can't resolve www.irishurls.com to an IP address.

This is what I got when I checked irishurls.com

# nslookup irishurls.com
Server:		192.168.192.1
Address:	192.168.192.1#53

Non-authoritative answer:
Name:	irishurls.com.net
Address: 74.221.212.214
Name:	irishurls.com.net
Address: 106.186.123.143
Name:	irishurls.com.net
Address: 199.167.196.149

handy article explaining DNS http://www.diaryofaninja.com/blog/2012/03/03/devops-dns-for-developers-ndash-now-therersquos-no-excuse-not-to-know

TarfHead

Thanks
Yes, that is the correct address and my code should be able to handle the response, or lack of response, and move on to the next link. Mu difficulty is that I do not know what state/condition/etc. to check for.

TarfHead

Turns out I had the try/catch specified incorrectly - should have had a catch specified for UnknownHostException.

Thanks