Writer或OutputStream？ [英] Writer or OutputStream?

问题描述

我正在设计一个库，其中一个类应该能够将自己的内部转换为文本。我应该使用哪个类： OutputStream 或 作家 ？它们之间的关键区别是什么（在我的情况下）？

I'm designing a library where a class should have an ability to be able to convert itself internals into text. Which class shall I use: OutputStream or Writer? And what is the key difference between them (in my case)?

public interface Memento {
  void save(OutputStream stream);
  void save(Writer writer);
}

哪一个？

推荐答案

OutputStream 是一个面向字节的流。您编写的任何文本都必须使用某种编码（最常见的是ISO-8859-1或UTF-8）编码为字节。 Writer 是一个面向字符的流，可能会也可能不会将字符内部编码为字节，具体取决于它写入的内容。

An OutputStream is a byte-oriented stream. Any text you write has to be encoded as bytes using some encoding (most commonly ISO-8859-1 or UTF-8). A Writer is a character-oriented stream that may or may not internally encode characters as bytes, depending on what it is writing to.

编辑如果您正在设计库，那么如果您提供要写入文本的 OutputStream -oriented接口，你真的应该为客户端类提供控制要使用的编码的能力。

EDIT If you are designing a library, then if you provide an OutputStream-oriented interface to which text is to be written, you really should provide client classes the ability to control the encoding to be used.

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