如何检查并关闭如果Excel文件是在java中已经打开

Question

可能重复：
Java: Check if file is already open

我想提出一个摆动工具在我创建并使用一个excel表由Apache poi。 如果文件已经打开，而我试图访问它，它会抛出一个异常像其他进程正在使用这个Excel文件。所以我想要的是检查，如果该Excel文件已被打开，如果是的话，关闭它。

Answer 1

你做这个话题的一些谷歌搜索：下面是一些我想出了

• Java: Check if file is already open
• check if a file is already open before trying to delete it
• checking that an excel file is already opened by another application

我从第一复印答案问题在这里的计算器：

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 someone else 
} finally { 
    lock.release(); 
} 

希望这会有帮助。

Answer 2

你有没有尝试过这样的：

File file = new File(pathToFile); 
if (file.canRead()) { 
    <do whatever you are doing with the file> 
}