在Java中关闭输入流 [英] Closing inputstreams in Java

问题描述

我在try / catch块中有以下代码

I have the following piece of code in a try/catch block

 InputStream inputstream = conn.getInputStream();
 InputStreamReader inputstreamreader = new  InputStreamReader(inputstream);
 BufferedReader bufferedreader = new BufferedReader(inputstreamreader);

我的问题是，当我必须在finally块中关闭这些流时，我是否必须关闭所有3个流或只是关闭 befferedreader 将关闭所有其他流？

My question is that when I have to close these streams in the finally block, do I have to close all the 3 streams or just closing the befferedreader will close all the other streams ?

推荐答案

按惯例，包装器流（包装现有的流）在关闭时关闭底层流，因此只需在示例中关闭 bufferedreader 。此外，关闭已经关闭的流通常是无害的，因此关闭所有3个流不会受到伤害。

By convention, wrapper streams (which wrap existing streams) close the underlying stream when they are closed, so only have to close bufferedreader in your example. Also, it is usually harmless to close an already closed stream, so closing all 3 streams won't hurt.

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