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renaming an existing file

Posted on 1997-10-31
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Last Modified: 2010-05-18
How do you rename an existing file on a local drive? In my application, I save a new file to a temporary name, and then rename it to the real name after I finish writing data to disk. In the method doSave(), I pass a File object that I create based on information the user specifies in a FileDialog. Note that theFile doesn't exist yet, it simply describes the file's pathname:



private boolean doSave(File theFile)

{

// create a unique file name for the temp file

String tempName = "_" + String.valueOf(System.currentTimeMillis());

File tempFile = new File(theFile.getParent(), tempName);



// create a RandomAccessFile object and pass to application's method

RandomAccessFile aRaf = new RandomAccessFile(tempFile, "rw");

myApp.writeData(aRaf);

// data is safely written to hard disk, so now rename temp file to real file name I want

boolean savedOK = (tempFile.renameTo(theFile));

return savedOK;

}



The method always returns false. The data is written to disk correctly, but the call to renameTo never works, and the file still has the temporary name.
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Question by:dacton
2 Comments
 
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Accepted Solution

by:
russgold earned 800 total points
ID: 1229705
You cannot rename a file while it is open.  

Add the line:

aRAF. close();

before:

tempFile. rename( theFile );
0
 

Author Comment

by:dacton
ID: 1229706
Yikes! I should have figured that one out. I added the close() call it it all works now. Thanks for the quick response.
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