移动文件而不释放锁 [英] Move a file without releasing lock

问题描述

我在Spring Batch应用程序中使用Java NIO.该应用程序查找目录(例如/shared/inbox)，其中/shared是在不同JVM上运行的所有应用程序实例之间的网络共享磁盘.

I am using Java NIO in spring batch application. The application looks in a directory (e.g. /shared/inbox) where /shared is network shared disk among all instances of applications running on different JVMs.

为避免多个线程读取相同的文件，请在ItemReader中使用FileLock，并避免其他线程从中读取文件.

To avoid multiple threads reading same files, in my ItemReader I take a FileLock and avoid other threads to read from it.

阅读完毕后，我想将文件移到另一个目录(例如/shared/archive).但是，除非我放弃FileLocl，否则Files.move方法无法做到这一点，并且如果我放弃锁，则冒着其他线程选择该文件的风险.

While I am done reading, I want to move the file to another directory (e.g. /shared/archive). But the Files.move method cannot do that unless I give up the FileLocl, and if I give up the lock, I run the risk of some other thread picking the file.

问题是，我可以在不放弃FileLock的情况下将文件从收件箱移至存档吗?

Question is, can I move the file from inbox to archive without giving up the FileLock?

推荐答案

尝试使用java.nio.channels.FileChannel

private static void copyFileUsingFileChannels(File source, File dest)throws IOException {
    FileChannel inputChannel = null;
    FileChannel outputChannel = null;
    try {
        inputChannel = new FileInputStream(source).getChannel();
        outputChannel = new FileOutputStream(dest).getChannel();

        outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
    } finally {
        inputChannel.close();
        outputChannel.close();
    }
}

祝你好运

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