锁定一个文件，甚至从操作系统读取，除了一个进程 [英] Lock a file for reading even from Operating System except a single process

问题描述

我有一个带有文件的加密zip。
我想解密所述文件，并使用解密文件的路径作为新的java程序的输入。

我不想让任何人阅读我的解密文件，也不要做任何其他事情。

我发现最好的解决方案是有几个不同的进程来监视我解压缩zip的文件夹，检查是否有人正在阅读文件或复制到另一个地方。

如果我使用 http://docs.oracle.com/javase/7/docs/api/java/nio/channels/FileLock.html ，锁只能在JVM上受到尊重吗？如果我使用操作系统剪贴板将文件复制到另一个地方，它会绕过我的锁？

除此之外，我有一个解压文件的java程序，之后调用命令实际上会读取解压缩的文件。这意味着我无法在JVM上锁定文件，我必须锁定它以供第三方命令使用。

什么是最好的方法或什么主题我应该google？

解决方案

Java FileLock 可能足以满足您的需求，但不适用于所有平台。从javadoc：

平台依赖关系

此文件锁定API是直接映射到底层操作系统的本机锁定工具。 因此，无论使用这些程序的语言如何，所有持有文件的锁都应该可以访问所有可以访问该文件的程序。

是否实际上阻止另一个程序访问锁定区域的内容是系统依赖的，因此未指定。

该文件有多大？您应该将文件解密到内存中，以便只有您的进程可以访问该文件。

I have a encrypted zip with a file inside it. I want to decrypt said file, and use the path of the decrypted file as a input to a new java program.

I don't want anyone to read my decrypted file, nor do anything else with it.

The best solution I've found is to have several different processes monitoring the folder where I extracted my zip, to check if anyone is reading the file or copying to another place.

If I use http://docs.oracle.com/javase/7/docs/api/java/nio/channels/FileLock.html, the lock is only respected on the JVM right? If I use the operating system clipboard to copy the file to another place it circumvents my lock right?

Besides that, I have a java program that unzips the file and after that calls the command that will in fact read the unzipped file.This means I can't lock the file on the JVM, I have to lock it to be used by a third party command.

What would be the best approach or what topic I should google?

解决方案

The Java FileLock may be enough for your needs, but doesn't work on all platforms. From the javadoc:

Platform dependencies

This file-locking API is intended to map directly to the native locking facility of the underlying operating system. Thus the locks held on a file should be visible to all programs that have access to the file, regardless of the language in which those programs are written.

Whether or not a lock actually prevents another program from accessing the content of the locked region is system-dependent and therefore unspecified.

How big is the file? You should decrypt the file into memory so that only your process has access to it.

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