Java URL problem?

Question

Greetings all,

I am trying to download 'gz' file using URL class .Code snippet is as:

URL url = new URL("ftp://ftp.wwpdb.org/pub/pdb/data/structures/all/pdb/pdb132l.ent.gz");
InputStream conn = new GZIPInputStream(url.openStream());

But it throws the error:

Exception in thread "main" java.net.UnknownHostException: ftp.wwpdb.org at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:525) at java.net.Socket.connect(Socket.java:475)

What could be the issue?

I am sorry, I was using 16bit JRE eventhough I'm in 64bit linux.. — Ashika Umanga Umagiliya
– Ashika Umanga Umagiliya, Commented Feb 18, 2010 at 8:51

Petar Minchev · Accepted Answer · 2010-02-18 07:17:22Z

4

I copy-pasted your code and it downloads the file on my machine. You probably have a network problem.

answered Feb 18, 2010 at 7:17

Petar Minchev

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6 Comments

Ashika Umanga Umagiliya Over a year ago

what? hmm..I can download the file using browser? only this happens in Java ?

TheGuyNextDoor Over a year ago

and are you java network settings the same as the browser settings?

Petar Minchev Over a year ago

Can you try this: InetAddress.getLocalHost() and tell if you get UnknownHostException.

Ashika Umanga Umagiliya Over a year ago

hi Peter, no there no errors for InetAddress.getLocalHost() it gives "umanga/192.168.2.33"

Petar Minchev Over a year ago

I know this sounds crazy, but if you are using TCP/IPv6, could you try removing the support for it from your machine and try again.

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Padmarag · Accepted Answer · 2010-02-18 07:15:34Z

1

I think you are missing the FTP username/password
You can use some FTP client library to download from FTP.
http://www.ajaxapp.com/2009/02/21/a-simple-java-ftp-connection-file-download-and-upload/

answered Feb 18, 2010 at 7:15

Padmarag

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1 Comment

Ashika Umanga Umagiliya Over a year ago

hmm.you can directily download the file in browser the link ftp.wwpdb.org/pub/pdb/data/structures/all/pdb/pdb132l.ent.gz

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