如何檢查並關閉如果Excel文件是在java中已經打開

Question

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

我想提出一個擺動工具在我創建並使用一個excel表由Apache poi。 如果文件已經打開，而我試圖訪問它，它會拋出一個異常像其他進程正在使用這個Excel文件。所以我想要的是檢查，如果該Excel文件已被打開，如果是的話，關閉它。

Answer 1

你做這個話題的一些谷歌搜索：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

我從第一複印答案問題在這裏的計算器：

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(); 
} 

希望這會有幫助。

Answer 2

你有沒有嘗試過這樣的：

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