java 替换日志消息中的参数并在 Log4j 2 中添加一个 Throwable
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Substituting parameters in log message and add a Throwable in Log4j 2
提问by derrdji
I am trying to log an exception, and would like to include another variable's value in the log message. Is there a Logger API that does this?
我正在尝试记录异常，并希望在日志消息中包含另一个变量的值。是否有执行此操作的 Logger API？
logger.error("Logging in user {} with birthday {}", user.getName(), user.getBirthdayCalendar(), exception);
采纳答案by DominicEU
Have you tried looking at ParameterizedMessage?
您是否尝试过查看ParameterizedMessage？
From the docs
从文档
Parameters:
messagePattern - The message "format" string. This will be a String containing "{}" placeholders where parameters should be substituted.
objectArgs - The arguments for substitution.
throwable - A Throwable
参数：
messagePattern - 消息“格式”字符串。这将是一个包含“{}”占位符的字符串，其中应替换参数。
objectArgs - 替换参数。
throwable - 一个 Throwable
回答by Dzmitry
There is an undocumented feature in Log4j 2 (and SLF4J 1.6+).
One can pass Throwableas the very last parameter. And it would then get a special treatment.
See AbstractLogger#logMessage(String, Level, Marker, String, Object...)and ReusableParameterizedMessage#initThrowable().
Log4j 2（和SLF4J 1.6+）中有一个未记录的功能。可以Throwable作为最后一个参数传递。然后它会得到特殊待遇。见AbstractLogger#logMessage(String, Level, Marker, String, Object...)和ReusableParameterizedMessage#initThrowable()。
There is no need to bother with ParametrizedMessage. The code in the question will work just as expected:
没有必要打扰ParametrizedMessage。问题中的代码将按预期工作：
logger.error("Logging in user {} with birthday {}", user.getName(), user.getBirthdayCalendar(), exception);
logger.error("Logging in user {} with birthday {}", user.getName(), user.getBirthdayCalendar(), exception);
