如何检查文件是否可以删除？ [英] How to check if a file can be deleted?

问题描述

我如何检查我可以用Java删除文件？

How can I check that I can delete a file in Java?

例如，如果文件 test.txt 在另一个程序中打开我无法删除它。我必须在实际删除之前知道它，所以我不能这样做：

For example, if a file test.txt is opened in another program I can't delete it. And I have to know it before actual deletion, so I can't do this:

if (!file.delete()) { ... }

和 srcFile.canWrite（）也不起作用。

推荐答案

使用Write Lock打开文件。

Open the file with a Write Lock.

请参阅此处 http： //download.oracle.com/javase/6/docs/api/java/nio/channels/FileLock.html

FileChannel channel = new RandomAccessFile("C:\\foo", "rw").getChannel();

// Try acquiring the lock without blocking. This method returns
// null or throws an exception if the file is already locked.
FileLock lock = channel.tryLock();

// ...  

// release it
lock.release();

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