java - 删除前检查文件或文件夹是否打开

Question

• 如何在我尝试删除文件/文件夹之前检查它是否打开。

• 正在以编程方式删除它..在删除之前，需要检查它是否打开

• 我想要这样的东西

              if(file/folder is open){
                 //do not delete it
              }else{
                 //delete it
               }
  

  我尝试了下面的两个代码集，但没有任何效果

       File scrptFile=new File(dirFile);
       boolean isFileUnlocked = false;
  try {
      org.apache.commons.io.FileUtils.touch(scrptFile);
      isFileUnlocked = true;
  } catch (IOException e) {
      isFileUnlocked = false;
  }
  
  if(isFileUnlocked){
      // Do stuff you need to do with a file that is NOT locked.
      System.out.println("file is not locked");
  } else {
      // Do stuff you need to do with a file that IS locked
      System.out.println("file is locked");
  }
  
  
         File file = new File(dirFile);
  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
      System.out.println("Ok. You get the lock");
  } catch (OverlappingFileLockException e) {
      // File is open by someone else
      System.out.println("File is open by someone else");
  } finally {
      lock.release();
  }
  

Answer 1

您可以使用 Apache commons io api，

  boolean flagFileNotInUse = false;
try {
    org.apache.commons.io.FileUtils.touch(yourFile);
    flagFileNotInUse = true;
} catch (IOException e) {
    flagFileNotInUse = false;
}

// 然后检查 flagFileNotInUse 的值，

  flagFileNotInUse = true, means file not in use
  flagFileNotInUse = false, means file in use