问题

我有一个文件，其扩展名为 .b3c，我想知道它是使用ASCII还是EBCDIC编码的，我应该如何在Java中实现这一点，请帮忙。

需要帮助。

谢谢

英文:

I have a file which extension is .b3c i want to know if it's encoded in ASCII or EBCDIC using java jow can I achieve that please.

Help is needed.

Thanks

答案1

得分: 2

假设文本文件包含多行文本，请检查是否有换行字符。

在ASCII中，行以 LF / \n / 0x0a 结尾。当然，在Windows中也有 CR，但我们可以忽略掉这部分。

在EBCDIC中，行以 NL / \025 / 0x15 结束。

ASCII文本文件中不会包含 0x15 / NAK，而EBCDIC文本文件中不会包含 0x0a / SMM，因此要同时查找两者：

英文:

Assuming the text file contains multiple lines of text, check for the newline character.

In ASCII, lines end with an LF / \n / 0x0a. Sure, on Windows there's also a CR, but we can ignore that part.

In EBCDIC, lines end with an NL / \025 / 0x15.

ASCII text files will not contain a 0x15 / NAK, and EBCDIC text files will not contain a 0x0a / SMM, so look for both:

If only one of them is found, you know the character set.
If both are found, the file is a binary file, and not a text file, so reject the file.
If neither is found, the file could have just one line of text, in which case further analysis might be needed. Hopefully that won't be the case for here, so the simple test done so far should be enough.

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