asked on

Rename file in Java

Hi,
I am renaming a file in Java on Linux O/S. The function renameTo returns true but file does not get renamed half the time. The file resides on a mounted folder on Linux machine. The code is below:

      // Rename the file with an appended .LOAD extension, so that next time
// this program will not pickup the same file again
      String renameToFile = filename + ".load";             //filename is valid file name
      File sourceFile = new File(filename);
if (sourceFile.renameTo(new File(renameToFile)))
{
//success, verify now
File destFile = new File(renameToFile);
boolean renamed = false;
while (TIMES_TO_RENAME_VERIFY-- > 0)             //5 times
{
try
{
Thread.sleep(RETRY_WAIT_TIME); //wait to confirm renaming        6000ms
if (destFile.exists())
{
renamed = true;
break;
}
}
catch (InterruptedException ie)
{
log.exception("File rename wait exception ", ie);
}
}

if (renamed)
log.info("Successfully renamed the file " + filename +
" to append .load at the end");
else
{
log.error("Failed to verify renamed file " + filename + ".load"); //this is the error I get
            return;
}
}
else
{
log.error("Unable to rename the file " + filename + " to append .load at the end");
return;
}

Michael Fowler

Try using Files.Move instead

String renameToFile = filename + ".load";
File sourceFile = new File(filename);
try {
     Files.move(sourceFile, sourceFile.resolveSibling(renameToFile));
} catch (IOException e) {
     log.error("Unable to rename the file " + filename + " to append .load at the end");
}

Open in new window

If your code only needs to be run on Linux another option would be to use Process Builder to run a Linux command such as mv although this method would be less than ideal.

https://docs.oracle.com/javase/6/docs/api/java/lang/ProcessBuilder.html
https://www.udemy.com/blog/rename-a-file-in-linux/

Am P

Check the location where the file is being created.

// Rename the file with an appended .LOAD extension, so that next time
// this program will not pickup the same file again
String renameToFile = filename + ".load"; //filename is valid file name
File sourceFile = new File(filename);
if (sourceFile.renameTo(new File(renameToFile)))
{
//success, verify now
File destFile = new File(renameToFile);
System.out.println("File Path : "+ destFile.getAbsolutePath());
boolean renamed = false;
while (TIMES_TO_RENAME_VERIFY-- > 0) //5 times
{
try
{
Thread.sleep(RETRY_WAIT_TIME); //wait to confirm renaming 6000ms
if (destFile.exists())
{
renamed = true;
break;
}
}
catch (InterruptedException ie)
{
log.exception("File rename wait exception ", ie);
}
}

if (renamed)
log.info("Successfully renamed the file " + filename +
" to append .load at the end");
else
{
log.error("Failed to verify renamed file " + filename + ".load"); //this is the error I get
return;
}
}
else
{
log.error("Unable to rename the file " + filename + " to append .load at the end");
return;
}

Vakils

ASKER

Sorry but I forgot to mention we are limited by Java 1.5

ASKER CERTIFIED SOLUTION

Michael Fowler

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SOLUTION

Tommy Braas

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