Java - 如何同时读写文件？ [英] Java - How to read and write a file simultaneously?

问题描述

java中是否有任何方法可以读取文件的内容，在关闭之前由另一个处理程序更新？

Is there any way in java to read a file's content, which is being updated by another handler before closing it?

推荐答案

这取决于操作系统。

传统上，POSIX-y操作系统（Linux，Solaris，...）对两个文件都打开完全没有问题读取和写入，甚至是通过单独的进程（它们甚至支持在读取和/或写入文件时删除文件）。

Traditionally, POSIX-y operating systems (Linux, Solaris, ...) have absolutely no problem with having a file open for both reading and writing, even by separate processes (they even support deleting a file while it's being read from and/or written to).

在Windows中，更常见的方法是单独打开文件（与普通人相反，Windows 支持非独占文件访问，它很少被应用程序使用）。

In Windows, the more common approach is to open files exclusively (contrary to common believe, Windows does support non-exclusive file access, it's just rarely used by applications).

Java无法指定您想要访问文件的方式 ^* ，因此使用平台默认值（Linux / Solaris上的共享访问权限，Windows上的独占访问权限）。

Java has no way^* of specifying what way you want to access a file, so the platform default is used (shared access on Linux/Solaris, exclusive access on Windows).

^* 对于Java 7中的NIO和新NIO，这可能是错误的，但我不是NIO的大专家。

^* This might be wrong for NIO and new NIO in Java 7, but I'm not a big NIO expert.

这篇关于Java - 如何同时读写文件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！