在Java中确定二进制/文本文件类型?

Determining binary/text file type in Java?(在Java中确定二进制/文本文件类型?)

问题描述

也就是说，你将如何从文本(xml/txt，编码无关)文件中区分存档(jar/rar/etc.)文件?

Namely, how would you tell an archive (jar/rar/etc.) file from a textual (xml/txt, encoding-independent) one?

推荐答案

没有万全之策，但有几种可能:

There's no guaranteed way, but here are a couple of possibilities:

1. 在文件中查找标题.不幸的是，标头是特定于文件的，因此虽然您可能会发现它是一个 RAR 文件，但您不会得到更通用的答案，即它是文本还是二进制文件.

1. Look for a header on the file. Unfortunately, headers are file-specific, so while you might be able to find out that it's a RAR file, you won't get the more generic answer of whether it's text or binary.

计算字符与非字符类型的数量.文本文件大多是字母字符，而二进制文件——尤其是压缩文件，如 rar、zip 等——往往会更均匀地表示字节.

Count the number of character vs. non-character types. Text files will be mostly alphabetical characters while binary files - especially compressed ones like rar, zip, and such - will tend to have bytes more evenly represented.

寻找有规律地重复的换行符.

Look for a regularly repeating pattern of newlines.

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