确定二进制/文本文件类型在Java中？ [英] Determining binary/text file type in Java?

问题描述

也就是说，你会怎么告诉存档（JAR / RAR /等）从一个文本（XML / TXT，编码无关）一个文件？

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

推荐答案

有没有保证的方式，但这里有几个可能的原因：

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

1）寻找该文件的标题。不幸的是，头文件是专用的，所以当你也许能发现，这是一个RAR文件，你不会得到它是否是文本或二进制更通用的答案。

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.

2）计数字符与非字符类型的数目。文本文件将主要字母字符，而二进制文件 - 尤其是COM pressed的像RAR，ZIP，这样的 - 往往会拥有更多的字节重新均匀presented

2) 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.

3）寻找新行的规则重复的模式。

3) Look for a regularly repeating pattern of newlines.

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