java - [Java]如何判断一个文件是否正在使用？

Question

如何判断一个文件是否被使用？

Answer 1

在 java 中，您可以锁定文件并检查 shared access .

You can use a file lock to restrict access to a file from multiple processes

public class Locking {
   public static void main(String arsg[])
       throws IOException {
     RandomAccessFile raf =
       new RandomAccessFile("junk.dat", "rw");
     FileChannel channel = raf.getChannel();
     FileLock lock = channel.lock();
     try {
       System.out.println("Got lock!!!");
       System.out.println("Press ENTER to continue");
       System.in.read(new byte[10]);
     } finally {
       lock.release();
     }
   }
}

您还可以通过调用检查是否存在锁

// Try acquiring the lock without blocking. This method returns
// null or throws an exception if the file is already locked.
        try {
            lock = channel.tryLock();
        } catch (OverlappingFileLockException e) {
            // File is already locked in this thread or virtual machine
        }