Question

Convert InputStream to File?

Asked by: DJ_AM_Juicebox

Hi,

I have an InputStream. I need to turn it into a File instance. The classes I'm working with look like this:

 InputStream is = SomeFactory.getResource("test.database");
 // read all bytes of the resource here into the InputStream

 File file = new File(is);

 DatabaseClass dc = new DatabaseClass(file);

so I have the raw InputStream, I need to read it, turn it into a File to give to my database class. Is this possible, if so how do I do it?

Thanks

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Asked On
2009-10-31 at 08:42:21ID24860791
Topic

Java Programming Language

Participating Experts
3
Points
500
Comments
9

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Answers

 

by: CEHJPosted on 2009-10-31 at 08:44:23ID: 25710179

Is that all your DatabaseClass can handle as a parameter?

 

by: CEHJPosted on 2009-10-31 at 08:45:38ID: 25710183

If so, all you can do is read that InputStream and save it to a temporary file

 

by: DJ_AM_JuiceboxPosted on 2009-10-31 at 08:48:07ID: 25710197

Yeah, the database class only accepts either a String path, or a File instance, ughh!

 

by: DJ_AM_JuiceboxPosted on 2009-10-31 at 08:49:41ID: 25710201

Oh, what's the most efficient way to dump it to a file then? The database file itself is about 40kb.

The reason I have to use this wacky scheme is because of the platform I'm on.

Thanks

 

by: CEHJPosted on 2009-10-31 at 08:49:53ID: 25710204

Of course, it's going to have to create an InputStream itself anyway - bad design ;-)

 

by: CEHJPosted on 2009-10-31 at 08:58:42ID: 25710228

>>Oh, what's the most efficient way to dump it to a file then?

It's the only way ;-)

 

by: TomasHelgiPosted on 2009-10-31 at 09:25:02ID: 25710317

         HI!

Use FIleOutputStream (to write to the file ) and FileInputStream (to read the file) in this case.
Look at these examples.
http://www.java2s.com/Code/Java/File-Input-Output/FileOutputStream.htm
http://www.java2s.com/Code/Java/File-Input-Output/FileInputStream.htm
and other File examples here
http://www.java2s.com/Code/Java/File-Input-Output/CatalogFile-Input-Output.htm

Hope this helps.

Regards,
   Tomas Helgi

 

by: CEHJPosted on 2009-10-31 at 09:28:30ID: 25710333

>>>>>>Oh, what's the most efficient way to dump it to a file then?

Sorry! Misread that line ;-) See

http://technojeeves.com/joomla/index.php/free/51-copying-streams

 

by: objectsPosted on 2009-10-31 at 14:52:14ID: 25711710

create a temporary file, and write the stream to that file

File tempFile1 = File.createTempFile(prefix, suffix);
OutputStream out = new FileOutputStream(tempFile1);
copy(is, out); // see link below
is.close();
out.close();


http://helpdesk.objects.com.au/java/how-do-i-create-a-temporary-file-using-java
http://helpdesk.objects.com.au/java/how-do-i-copy-one-stream-to-another-using-java

you can delete the temp file once done

http://helpdesk.objects.com.au/java/how-do-i-delete-a-file

20120131-EE-VQP-002

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