File.renameTo() Question

I am writing a small utility to parse some files and all is well except when there is a colon in the "to" filename i.e.
fileName = "MONDAY : 9AM.TXT"
It doesn't like the colon. Any way around this???
The files that don't have colons work fine but, any new filename that contains a colon will return false (from renameTo())
Thanks,
Kevin

fileName = "MONDAY : 9AM.TXT"Did you ever tried to save the file with the above format.....i guess windows doesn't allow this format

Similar Messages

I got new hard driver for my MacBook I don't have the cd but I do have flash drive that has the software I need help because when I turn on my laptop it shows me a file with question mark how can I install the software from the flash driver?

I got new hard driver for my MacBook I don't have the cd but I do have flash drive that has the software I need help because when I turn on my laptop it shows me a file with question mark how can I install the software from the flash driver?

Hold down the Option key while you boot your Mac. Then, it should show you a selection of devices. Click your flash drive and it will boot from that.

Concurrent processing & file.renameTo(...)

Hi,
I've can successfully move a file in the single thread/process environment using file.renameTo
However in the multithreaded/multiple process environment, the initial file is several MB (about 100mb). It is created on the fly outside of my thread and takes several minutes to build.
I would like to rename it after the file is finished building.
In my code I do the following:
boolean success = false;
while (! success)
success = inputFile.renameTo(dest);
QuickSleep(1500); // Performs a Thread.sleep in a try/catch
I've seen some weird behavior however. On a windows box the renameTo seems to return false if the other process is still writing to the file. However on linux the .renameTo is returning true even though the file hasn't finished building.
The end result on linux is I end up with two files. One that got renamed and is partially filled and the other original with the rest of the file.
Is there a way to know when the file isn't being written by another process/thread?
Thanks in advance.

if by now you still have the problem (FYI this is working on AIX) have a look at my solution:
for (int i = 0; i < dir.listFiles().length; i++) {
try {
     Process p = Runtime.getRuntime().exec("/usr/sbin/fuser " + dir.listFiles().getAbsolutePath());
     p.waitFor();
     InputStream in = p.getInputStream(); // we have to read the stream to verify if there is a process id
     int c = in.read();
     String stream = "";
     while (c != -1) {
          stream = stream + (char)c;
          c = in.read();
     if (stream.trim().length() > 0) {
          logger.info("File: " + dir.listFiles()[i] + " is in use by process ID:" + stream);
          try {
               Thread.sleep(5000); //sleep for 5 sec
          } catch (InterruptedException e){
               // the VM doesn't want us to sleep anymore,
               // so get back to work
          continue;
} catch (Exception e) {
     logger.error("fuser exception: " + e.getMessage());

Java.io.File renameTo does not work on Solaris

Hi Experts,
I have a code-piece which tries to move files from one directory to another on the SAME FILE SYSTEM using java.io.File.renameTo method.
It works fine when there less no. of files in the source directory. But the renameTo does not work as expected when there are very huge no. of files(~40K) present in the source directory.
I am aware that there is a known issue when one tries to use this method to move files across file systems OR if the file exists at the destination directory.
But in my case the file system is the same and the there is no such file in the destination directory.
I suspect some inode related issues. But not sure what it is exactly.
Is there any limitations of renameTo?
Please help.

OK, we all now understand you have a problem in doing this, but without the specifics of the problem that you are experiencing, then it is fairly difficult to give you anything other than a guess. If you would like some specific and relevent answers, please supply specifics about how exactly the operation differs from your expected results. You should also post example code as it is almost always asked for eventually.

HT1752 My MacBook on startup shows file with question mark ,, what now?

My Mac shows file with question mark, what now.

Press the power button down to force a emergency use only hardware shutdown.
Press and hold the Option/alt key on the built in keyboard, boot the machine.
If MacintoshHD appears, select it and click the arrow, then in System Preferences > Startup Disk reset that. Done.
Sometimes a NVRAM reset is required then the above done again.
Folder with question mark issue
..Step by Step to fix your Mac
If MacintoshHD doesn't appear, or if it boots to gray screen or other issues, then it's more complicated of a fix, but once inside OS X then reset the Startup Disk.
Gray, Blue or White screen at boot, w/spinner/progress bar
..Step by Step to fix your Mac
You might need this if you don't have a recent backup and your problem is software related, Disk Utiltiy can't fix the drive and recommends you backup, erase and install.
.Create a data recovery/undelete external boot drive
If Disk Utility + Hardware Test shows no boot drive, then you have a dead drive or cable, or Mac issue.
My computer is not working, is my personal data lost?

File.renameTo(File) doesn't change dirs on Linux?!

Hi All,
I'm trying to change a file's name and directory with File.renameTo but it doesn't work. It says in the manual that changing dirs is O/S dependent, so i guess it doesn't work on Linux.
Is it correct? if so, what can be done to change a file's name and directory?
File oldFile = new File(filePath);
oldFile.delete();   // Delete old file
File newFile = new File(newFilePath);     // This is the new file
File tempFile = new File(filePath);          // Get name to renameTo
newFile.renameTo(tempFile)                  // Try to rename

Hmm, it worked for me, though I didn't try deleting the oldFile. A simple move from one directory to another was not problem, though. The rename would fail if the delete failed. You might check that.

File.renameTo

Hi,
Does file.renameTo work on AIX Server,and how much time will this method take to move a file of 35 million records?
Regards
KK

NAME
rename - rename a file
SYNOPSIS
   #include <stdio.h>
    int rename(const char old, const char new);
DESCRIPTION
The rename() function changes the name of a file.
The old argument points to the pathname of the file to be renamed.
The new argument points to the new pathname of the file.
posman@proli:~/ivan> df -k . /tmp
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/cciss/c0d0p3     16682556 14755300   1927256 89% /home
/dev/cciss/c0d1p2     35539772 33619432   1920340 95% /
posman@proli:~/ivan> cat x.c
#include <stdio.h>
int main() {
int r = rename("movethis","/tmp");
if (r !=0) perror("rename");
return r;
}posman@proli:~/ivan> gcc x.c -o x
posman@proli:~/ivan> ./x
rename: Invalid cross-device link
Edited by: BIJ001 on Oct 1, 2007 9:01 AM

File.renameTo() and locking

Hi,
I would like to rename file, but File.renameTo() will not work if the file will be locked by some other process. If other process has locked the file, I would like to wait for it to release the lock. So I have:
FileLock lock = new RandomAccessFile(file, "rw").getChannel().lock(0L, Long.MAX_VALUE, false);
file.renameTo(destFile);
lock.release();But this does not work, because file is locked and renameTo does not work (returns false).
What can I do to lock the file myself (wait for other locks to be released) and to rename it (rename does not work when file is locked).
Regards
Pawel Stawicki

hi, I don't thik you have to lock the file yourself while renaming it because that is (from my point of view) an opperating system's job to do it.
you could maybe make a
while(! file.renameTo()){
thread.sleep(1000);
to wait till its unlocked.
I'm not sure that helps but that's just an idea

File.renameTo() bugg? Leaves the file open

I came across the strangest behaviour of File.renameTo() for the following steps:
1. Rename a file - successful
2. Rename the same file again - will fail. Also delete will fail.
-------- some code ----------
File file=new File("F1");//nonexistent file
//write some to the file - just to make the file to be created
RandomAccessFile rFile=new RandomAccessFile(file,"rw");
rFile.writeBytes("Hello");
rFile.close();
//A successful rename
boolean renamed=file.renameTo(new File("F2"));
System.out.println("renamed="+renamed);
//This is commented code for now
//rFile=new RandomAccessFile(file,"rw");
//rFile.close();
//This rename fails!
renamed=file.renameTo(new File("F3"));
System.out.println("renamed again="+renamed);
As it seems File.renameTo() sets the file to open, since neither renameTo or delete will work after a renameTo.
BUT, if I uncomment the commented code, it will work again! I just open a dummy RandomAccessFile (FileInputStream would work as well I guess) and then close it, and somehow the file is set to closed again, and the second renameTo() will work.
Is this a bugg in File.renameTo()? I run on windows XP and have java 1.4.1_02-b06. I couldn't find any comment about this in the Bug Database.
Gil

Aha! so the reason why the opening of the dummy RandomAccessFile did it in my previous code, was becase it created the old File "F1" again that could be renamed again. So the correct code should instead be:
-------- some code ----------
File file=new File("F1");//nonexistent file
//write some to the file - just to make the file to be created
RandomAccessFile rFile=new RandomAccessFile(file,"rw");
rFile.writeBytes("Hello");
rFile.close();
//A successful rename
File file2=new File("F2");
boolean renamed=file.renameTo(file2);
System.out.println("renamed="+renamed);
//Now this rename also succeeds!
renamed=file2.renameTo(new File("F3"));//do rename on file2!
System.out.println("renamed again="+renamed);
Gil

File.renameTo method issue

I have a Java program which processes upto 10000 text files a day. The average size of these files are 1KB to 2KB and the java program parses the contents of the text file, validates and loads them into a database table.
The program outline is as follows
File[] filesToProcess = sourceFolder.listFiles();
int fileCount = filesToProcess.length;
for (int i=0;i<fileCount;i++) {
File currentFile = filesToProcess;
MsgParser fileParser = new MsgParser(currentFile);
if ( fileParser.isMessageValid()) {
boolean uploadSuccess = fileParser.uploadToDB();
if (uploadSuccess) {
if (currentFile.renameTo(parseSuccessArchiveFile))
logger.info("File successfully moved to archive folder);
else
logger.info("File cannot be moved to archive folder);
} else {
if (currentFile.renameTo(parseFailureArchiveFile)
logger.info("Parser failed file moved to archive folder);
else
logger.info("Parser failed file cannot be moved to archive folder);
The above program outline works well. However the renameTo method is not renaming the parsed files successfully on all occasions. There is no performance issue involved here as the files keep streaming in throughout the day and the program is able to handle the parsing of the file(s) in a fraction of second.
The issue for me is that I keep picking the files to parse from the source folder at regular intervals ( after a full iteration of the files list, wait for 10 seconds before calling for a new set of files ) and cannot afford to have a failure in moving the file to the archive folder as otherwise, I end up parsing the same file multiple number of times, which I want to avoid.
Can anyone shed some light on the behavior of File.renameTo and how to make it work successfully?
Sundar

I am making the code more readable for you all and corrected some typo errors...
File[] filesToProcess = sourceFolder.listFiles();
int fileCount = filesToProcess.length;
for (int i=0;i<fileCount;i++) {
      File currentFile = filesToProcess;
      MsgParser fileParser = new MsgParser(currentFile);
      boolean uploadSuccess = false;
      if ( fileParser.isMessageValid())
           uploadSuccess = fileParser.uploadToDB();
      if (uploadSuccess) {
            if (currentFile.renameTo(parseSuccessArchiveFile))
                  logger.info("File successfully moved to archive folder);
            else
                  logger.info("File cannot be moved to archive folder);
      } else {
            if (currentFile.renameTo(parseFailureArchiveFile)
                  logger.info("Parser failed file moved to archive folder);
            else
                  logger.
                  info("Parser failed file cannot be moved to archive folder);
}

File and question mark when starting

Flashing file and question marl when i start my computer

There are four general causes of this issue:
1. The computer's PRAM no longer contains a valid startup disk setting when there aren't any problems with the disk itself. This can be checked for by pressing the Option key and seeing if the drive appears.
2. The internal drive's directory structure has become damaged. This requires usage of an alternate bootable system to perform the repair.
3. Critical system files have been deleted. This requires usage of an alternate bootable system to reinstall them.
4. The internal drive has died or become unplugged. This is the most likely case if the computer took a sharp impact or there are unusual sounds coming from its location.
(103563)

.AVI file format question

Upgrading from CS2 to Photoshop CS5
I found out after the fact that in order to edit video you need CS5 Extended.
So, I then went and returned regular and upgraded to Photoshop CS5 extended.
(See my other thread for details, but installing the 12.01 patch is not an option at this time.)
Try to use file open to open a .AVI file from one of my cameras and get a message of "unrecognized file format".
Was able to import the 7 second video into layers.
Checked support issues, and installed Quicktime 7.6.8
Also, due to 12.01 issues, reinstalled Photoshop CS5 Extended AFTER upgraded Quicktime to 7.6.8
Machine specs: Toshiba Satellite P30 Intel Pentium 4 CPU 3.60 GHZ (Hyperthreading Dual Core) 2GB RAM ATI Mobility Radeon X600 Win XP Professional SP3 About 12 GB disk space available at install time.
Note that Quicktime will open the .AVI file in question with no problems, as well as Roxio software (trying to get rid of that with CS5)

I talked to support via phone and it appears the the problem is in installation. The install of CS5 extended did not take over the regular install. So, I need to start by completely uninstalling AGAIN and installed extended from scratch AGAIN.
I did try the program mention GSPOT as well. It says AVI codecs are installed on the machine inquestion. I will get more informaiton tonight afte rI do the re-install and see what happens.

File Serializable question

hi,
i know i've seen plenty of posts asking how to transfer files, my question is why doesn't simplying sending a file object from the client to the server work, file just implement Serializable? is it because the contents don't travel with the object? i'm pretty sure the object will go across, via socket programming or rmi, but why not the contents, or will they?
Thank you.

Because the file object, to the best of my knowledge,
does not hold the contents, it just contains
information about the file, such as its path.Very true. I never thought about it in this depth before, but the [url http://java.sun.com/j2se/1.4.1/docs/api/java/io/File.html]API says:
"An abstract representation of file and directory pathnames."
That's all it is, a representation, not an actualy file.
Cheers,
Radish21

JFileChooser and File.renameTo()

Hi,
Anyone experienced strange behaviour from the JFileChooser returned
File Object. In my case it's an instance of:
sun.awt.shell.Win32ShellFolder2
Unfortunatly the File.renameTo(File file) method doesn't work
properly with this File instance.
Anyhelp is welcome / dzone

overwrite the approveSelection() method of your JFileChooser. in there you can do your checks before executing super.approveSelection().
tthomas

Checkpointing - control file contents question

Some clarification is needed if possible...
When you commit a transaction:
- commit scn is recorded in the itl of the data block and undo segment header
- lgwr records the committed scn (for all data blocks involved) to the redo log
Checkpoint Event
- (3 seconds or possibly less passes by) CKPT wakes up and signals DBWn to write dirty (modified and committed)
blocks to disk
- CKPT records the scn of those blocks in the control file (data file and redo thread sections) and the data file
header (task of checkpoint when a log switch occurs)
- Checkpoint position in the Redo Log is forwarded
Control file contents question:
When LGWR writes the commit scn to the redo log, who writes the scn to the control file? LGWR or CKPT?
Also, when is the redo thread scn written?
Matt

Matt,
This is my understanding of the stuff. Feel free to correct me.
Checkpoint SCN , as I mentioned in my last reply is the marker of the point till which the data is "chekpointed" to the datafiles. This marker tells the controlfile that in the case of the crash, where to start recovery of the datafile and have to go which extent in the redo stream? This is only available in the datafile header and in the controlfile. This doesn't get recorded in the redo log file/stream.
I mentioned checkpoint queue in my reply too. Though I couldn't find any reference directly mentioned between this and in the checkpoint SCN but I believe my theory , if not totall, partially is correct. The incremental checkpoint is the stuff which makes the decision that how many redo blocks needs to be applied to the datafile if its closed without a proper checkpoint. So this part is maintained in the Datafile header itself in the form of the checkpoint SCN. When not matched with the conrolfile checkpoint SCN, which is always higher than this, a recovery is reported.
I hope its somewhat correct. Do let me know your views too.
Cheers
Aman....

File.renameTo() Question

Similar Messages

Maybe you are looking for