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File object from URL object

Posted on 2004-09-06
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Last Modified: 2010-08-05
Hi,
   What's the easiest way to get a File object from a URL object?


Thanks!
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Question by:petepalmer
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23 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989228
String file = url.getFile();
File f = new File(file);
0
 
LVL 1

Author Comment

by:petepalmer
ID: 11989254
I tried that and it dropped dead....


hmmm, I'm going to go recheck what I put - maybe I missed something....
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989271
Make sure the path returned resolves in the file system
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LVL 30

Expert Comment

by:Mayank S
ID: 11989301
Does the URL refer to a remote location?
0
 
LVL 37

Expert Comment

by:zzynx
ID: 11989302
new File(url.getFile());
0
 
LVL 37

Expert Comment

by:zzynx
ID: 11989304
Ooops, the refreshing problem again... :°(
0
 
LVL 1

Author Comment

by:petepalmer
ID: 11989307
Okay my bad, it wasn't the file that was the problem.... it's just the way I was trying to parse it :


URL fileURL = new URL(args[0]);

            File file = new File(fileURL.getFile());


            parser.parse(file.toString());


I've tried numerous things but this is what I have ended up with so far lol
0
 
LVL 1

Author Comment

by:petepalmer
ID: 11989312
The URL does point to a remote website
0
 
LVL 18

Expert Comment

by:armoghan
ID: 11989315
if the file is placed on the server then you have to download it
try this
http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_20736476.html
0
 
LVL 18

Expert Comment

by:armoghan
ID: 11989330
Extract from the above mentioned Link

java.net.URL url = new java.net.URL("http://www.yahoo.com/");
java.net.URLConnection connection = url.openConnection();
BufferedReader in = new BufferedReader(
                                new InputStreamReader(
                                connection.getInputStream()));
String inputLine;
StringBuffer html = new StringBuffer("");
while ((inputLine = in.readLine()) != null)
        html.append(inputLine);

out.print("read=" + html.toString());
0
 
LVL 1

Author Comment

by:petepalmer
ID: 11989332
Surely there has to be an easier way than that? I only want to pass the xml document to the parser....
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 11989335
>> The URL does point to a remote website

Could cause problems if there is a proxy or a firewall in between.
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 11989338
Might be better to download it and save a temporary copy.
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 11989339
You can use the createTempFile () method of the File class.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989340
>>The URL does point to a remote website

Then you may want to do

    String[] atoms = file.toString().split("/");
    String name = atoms[atoms.length - 1];
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 500 total points
ID: 11989345
>>Surely there has to be an easier way than that? I only want to pass the xml document to the parser....

Use the url ctor of the parser
0
 
LVL 1

Author Comment

by:petepalmer
ID: 11989351
Well firewall isn't a problem - using good old http for moving files around - ftp is too "messy" :)

How would I use the createTempFile() method  ?

*goes to check the docs in the meantime*
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989352
>>Then you may want to do

Ignore that  - i didn't think you were trying to access a remote file as a local one
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989358
You don't need to create files at all - just read the URL directly by passing it to the ctor of the parser
0
 
LVL 18

Expert Comment

by:armoghan
ID: 11989422
In my above mentioned example, you can get the HTML as a String and pass it on to the parser
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989451
No need for that. Nearly all parsers will accept a URL to the ctor - in fact they'd prefer a URL to a File
0
 
LVL 1

Author Comment

by:petepalmer
ID: 11989572
Okay, I just put the URL in there - and of course it worked perfectly. I now feel a complete idiot for not trying that in the first place lol - I have no idea why I decided to try and be clever by doing all that stuff with it.....

ah well, that isn't a mistake I'll be repeating in the near future :)

Thanks all!
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 11989635
:-)
0

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