导致FileNotFoundException的FileInputStream - 进程无法访问该文件

Question

我正在使用Watcher Service让我注意添加或删除特定目录中的文件。到目前为止，我已经将它用于添加文件和删除文件。然而，当我添加文件，删除该文件，然后再次重试添加该文件时，我看到的是堆栈跟踪(java.io.FileNotFoundException: C:\data\index.php (The process cannot access the file because it is being used by another process)。

以下是我的getDigest方法的try块中发生错误的相关代码：

public class WatchDir implements Runnable{

        for (WatchEvent<?> event: key.pollEvents()) {
            WatchEvent.Kind kind = event.kind();

            // Context for directory entry event is the file name of entry
            WatchEvent<Path> ev = cast(event);
            Path name = ev.context();
            Path child = dir.resolve(name);

            if(!Files.isDirectory(child, NOFOLLOW_LINKS)){
                //Callable<LftFile> worker;

                try {
                    **this.file = new LftFile(child.toFile(), kind != ENTRY_CREATE);**

                    if(this.file.isDeleted()){
                        // Update DB, set deleted flag              

                    } else {    
                        // Add to DB
                        }                       

                } catch (Exception e1) {
                    logger.error("...");
                }                   
            }

...
...

   }
}




    // this is a method within the LftFile.  It reads in the file's content
    // and creates a crc on it.  This is for future validation.
private static long getDigest(File f) {
    long crc = -1;
    try ( **InputStream in = new FileInputStream(f)** ) {   // <--- ERRS HERE
        CRC32 crcMaker = new CRC32();
        byte[] buffer = new byte[2048];
        int bytesRead;
        while((bytesRead = in.read(buffer)) != -1) {
            crcMaker.update(buffer, 0, bytesRead);
        }
        crc = crcMaker.getValue();  
    } catch (Exception e) {
        e.printStackTrace();
    }   
    return crc;
}