关闭I / O流 [英] closing the streams of I/o

问题描述

当我不关闭流时会发生什么不好的事情？

What are the bad things that can happen when I don't close the stream?

关闭操作会自动刷新吗？

Does the close operation automatically flush?

程序退出后所有流程都关闭了吗？

Are all the streams closed after the program exits?

提前致谢。

推荐答案

当你不关闭你的溪流时可能发生的坏事：

Bad things that can happen when you don't close your streams:

• 你可以跑其他文件句柄


• 您认为写入磁盘的数据可能仍在缓冲区中（仅限）


• 文件可能仍会被其他文件锁定流程（取决于平台）


• ...

• you can run out of file handles
• data that you think is written to disk may still be in the buffer (only)
• files might still be locked for other processes (depends on the platform)
• ...

是的，关闭操作总是刷新流。

Yes, close operation always flushes the stream.

操作系统知道的所有文件句柄都已关闭。这实际上意味着 FileOutputStream ， FileInputStream 以及 Socket 将被关闭。但是如果你在 BufferedOutputStream 中包装 FileOutputStream 那么 BufferedOutputStream 操作系统 关闭/刷新因此，写入 BufferedOutputStream 但尚未刷新到 FileOutputStream 的数据可能会丢失。

All file handles that the OS is aware of are closed. This means effectively that FileOutputStream, FileInputStream and the input/output of a Socket will be closed. But if you wrap a FileOutputStream in a BufferedOutputStream then that BufferedOutputStream will not be known to the OS and won't be closed/flushed on shutdown. So data written to the BufferedOutputStream but not yet flushed to the FileOutputStream can be lost.

这篇关于关闭I / O流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！