java log4j 打印错误的字符
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log4j prints wrong characters
提问by AndrewBourgeois
Somebody reports me that the program I gave him that uses log4j doesn't correctly print characters. He tells me that "é" gets printed in the file as "??" (for example: "Vidéo" becomes "Vid??o").
有人报告我说我给他的使用 log4j 的程序不能正确打印字符。他告诉我“é”在文件中被打印为“??” （例如：“Vidéo”变成“Vid??o”）。
It's probably some encoding issue, but I like to reproduce problems to prove that it's fixed. I was unable to find good (and short) documentation on the subject so:
这可能是一些编码问题，但我喜欢重现问题以证明它已修复。我找不到关于这个主题的好的（和简短的）文档，所以：
- What causes this problem (and how does log4j chose the encoding?)?
- Can it be fixed by simply using "log4j.appender.myappender.encoding=UTF-8" ?
- 是什么导致了这个问题（以及 log4j 是如何选择编码的？）？
- 可以通过简单地使用“log4j.appender.myappender.encoding=UTF-8”来修复吗？
Thank you for the help!
感谢您的帮助！
回答by Joachim Sauer
WriterAppender(which is the base class for FileAppenderand its variants. Has a setEcodingmethod. So yes: using log4j.appender.myappender.encoding=UTF-8should simply work.
WriterAppender（这是FileAppender及其变体的基类。有一个setEcoding方法。所以是的：使用log4j.appender.myappender.encoding=UTF-8应该很简单。
Note, however, that "Vidéo" becoming "Vid??o" looks like it iswriting UTF-8, but whatever you use to view the file interprets it as some other encoding (usually that's some ISO-8859-* encoding or one of the ISO-derivatives).
但是请注意，“Vidéo”变成“Vid??o”看起来像是在编写 UTF-8，但是无论您使用什么查看文件，都会将其解释为某种其他编码（通常是某种 ISO-8859-* 编码或一种ISO 衍生物）。
?is U+00C3 and ?is U+00A9. They are encoded as 0xC3 and 0xA9 in ISO-8859-1.
?是 U+00C3 和?U+00A9。它们在 ISO-8859-1 中编码为 0xC3 和 0xA9。
éis U+00E9 which is encoded as 0xC3 0xA9 in UTF-8.
é是 U+00E9，它在 UTF-8 中被编码为 0xC3 0xA9。
回答by Rich
If your user is viewing the log files over SSH, then they need to tell their SSH client to use UTF-8 too.
如果您的用户正在通过 SSH 查看日志文件，那么他们需要告诉他们的 SSH 客户端也使用 UTF-8。
