问题
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?
回答1:
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.
来源：https://stackoverflow.com/questions/23547224/lock-a-file-for-reading-even-from-operating-system-except-a-single-process