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Dec 26, 2011 · public boolean isFileOpened(File file) boolean res = false; FileChannel channel = new RandomAccessFile(file, "rw").getChannel(); // Get an exclusive lock on the whole file FileLock lock = channel.lock(); try { //The file is not already opened lock = channel.tryLock(); } catch (OverlappingFileLockException e) { // File is open by someone else res = true; } finally { lock.release(); } return res; }

I'm just using the java.io.File package and there is a canWrite() method but that doesn't seem to test if the file is in use by another ...

Mar 12, 2013 · File file = new File(fileName); FileChannel channel = new RandomAccessFile(file, "rw").getChannel(); // Get an exclusive lock on the whole file FileLock lock = channel.lock(); try { lock = channel.tryLock(); // Ok. You get the lock } catch (OverlappingFileLockException e) { // File is open by other end } finally { lock.release(); }

18.07.2012 · Java: Check if file is already open. I am making a swing utility in which i am creating and using a excel sheet by Apache poi. If the file is already opened while i m trying to access it it throws an exception like some other process is using this excel file. So all i want is to check if that excel file is already opened and if yes then close it.

Are U asking to use File.length() method? It returns 0 if file doesn't exit. May be I should add a condition to check whether a file exits, also whether it is a ...

06.09.2009 · A simpler though non-portable solution is to just try the rename (or whatever it is you are trying to do) and diagnose the return value and / or any Java exceptions that arise due to opened files. Notes: If you use the FilesAPI instead of the FileAPI you will get more information in the event of a failure.

File tempFile = new File("c:/temp/temp.txt"); boolean exists = tempFile.exists();

Sep 07, 2009 · // TO CHECK WHETHER A FILE IS OPENED // OR NOT (not for .txt files) // the file we want to check String fileName = "C:\\Text.xlsx"; File file = new File(fileName); // try to rename the file with the same name File sameFileName = new File(fileName); if(file.renameTo(sameFileName)){ // if the file is renamed System.out.println("file is closed"); }else{ // if the file didnt accept the renaming operation System.out.println("file is opened"); }

I am trying to check if a certain java.io.File is open by an external program. On windows I use this simple trick: try { FileOutputStream fos = new FileOutputStream(file); // -> file was closed } catch(IOException e) { // -> file still open } I know that unix based systems allow to open files in multiple processes...

Java FileInputStream class is used to open and read a file. We can open and read a file by using the constructor of the FileInputStream class. The signature of the constructor is: public FileInputStream (File file) throws FileNotFoundException It accepts a file as an argument.

You can use this code to check if a file exists or not before starting to write into it or open it for any operation. Just keep in mind that the ...

Nov 27, 2012 · Show activity on this post. I have a scenario where i have used to open a file using the java commands in following steps. a) creating File object for the location of file. File f = new File (filePath); b) then using system application (like Excel) to open the file. Desktop desktop = null; if (Desktop.isDesktopSupported ()) { desktop = Desktop.getDesktop (); } try { desktop.open (f); } catch (IOException e) { }

How do I check if a certain file on the client desktop is open by any process? Here is the scenario: I generate a vb script from an applet to print a pdf file.

Java's own Input/Output package java.io.File has the exists() method to check if the specified file exists. This function returns boolean , ...

30.09.2009 · My Java program wants to read a file which can be locked by another program writing into it. I need to check if the file is locked and if so wait until it is free. How do I achieve this? The Java program is running on a Windows 2000 server.

For example, if a file test.txt is opened in another program I can't delete it. And I have to know ... 8. Checking ...

// TO CHECK WHETHER A FILE IS OPENED // OR NOT (not for .txt files) // the file we want to check String fileName = "C:\\Text.xlsx"; File file = new File(fileName); // try to rename the file with the same name File sameFileName = new File(fileName); if(file.renameTo(sameFileName)){ // if the file is renamed

In Java, we can use Files.exists(path) to test whether a file exists. The path can be a file or a directory. It is better to combine with !

20.07.2018 · Check if a file exists in Java Object Oriented Programming Java Programming Java8 The java.io.File class provides useful methods on file. This example shows how to check a file existence by using the file.exists () method of File class. Example

To simply check for a file's existence, we can use exists() and notExists() method of java.nio.file.Files class. The exists() method returns true if the file ...

Read-only files can be opened and accessed but you will not be able to make changes to it. You can make a file read-only by using setReadOnly() method and can ...