我应首先转换字节流，缓冲区流或字符流? [英] Which shall I convert a byte stream first, buffer stream or char stream?

问题描述

要获得给定字节流的缓冲char流，我应将字节流转换为第一个，缓冲流还是char流?

To get a buffered char stream for a given byte stream, which shall I convert the byte stream to first, a buffer stream or a char stream?

1. 给出一个OutputStream对象os(例如FileOutputStream 对象或System.out)，似乎有两种方法可以获取 缓冲的字符流:

1. Given an OutputStream object os (such as FileOutputStream object or System.out), there seems to be two ways to get a buffered char stream:

new BufferedWriter(new OutputStreamWriter(os));

new OutputStreamWriter(new BufferedOutputStream(os));

它们之间有什么区别?

给出一个InputStream对象is(例如FileInputStream对象 或System.in)，似乎有两种方法可以获取缓冲的char 流:

Given an InputStream object is (such as FileInputStream object or System.in), there seems to be two ways to get a buffered char stream:

new BufferedReader(new InputStreamReader(is));

new InputStreamReader(new BufferedInputStream(is));

它们之间有什么区别?

推荐答案

1. 如javadoc中针对 OutputStreamWriter 所述>

1. As stated in javadoc for OutputStreamWriter

传递到write()方法的字符不被缓冲.
为获得最高效率，请考虑将OutputStreamWriter包装在BufferedWriter中，以避免频繁的转换器调用.例如:
Writer out = new BufferedWriter(new OutputStreamWriter(System.out));

The characters passed to the write() methods are not buffered.
For top efficiency, consider wrapping an OutputStreamWriter within a BufferedWriter so as to avoid frequent converter invocations. For example:
Writer out = new BufferedWriter(new OutputStreamWriter(System.out));

由于转换后的结果字节已累积在缓冲区中，因此不需要在OutputStreamWriter之后通过管道插入BufferedStream

Since resulting bytes after conversion are accumulated in a buffer, there is no need to in-pipe BufferedStream after OutputStreamWriter

因此，常规方法是使用:

Thus, the conventional way is to use:

new BufferedWriter(new OutputStreamWriter(os));

1. InputStreamReader 的类似原因

使用:

new BufferedReader(new InputStreamReader(is));

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