java - 多线程访问文件

Question

我们有一个多线程 java 程序。多线程将写入一个文件，一个线程将从该文件读取。我正在寻找一些设计理念。是否需要同步？

Answer 1

FileChannel理论上是线程安全的。来自 javadoc:

File channels are safe for use by multiple concurrent threads. The close method may be invoked at any time, as specified by the Channel interface. Only one operation that involves the channel's position or can change its file's size may be in progress at any given time; attempts to initiate a second such operation while the first is still in progress will block until the first operation completes. Other operations, in particular those that take an explicit position, may proceed concurrently; whether they in fact do so is dependent upon the underlying implementation and is therefore unspecified.

如果您可以使用这些，那么您就可以使用内置同步，而不必自己编写。