I want to add logging to an application I am developing, using apache log4j. At this point I want to redirect all log messages for level INFO and lower (TRACE, DEBUG) to stdout and all other log messages from WARN and above (ERROR, FATAL) to stderr. For example:I want to add logging to an application I am de
阅读背景：
记录错误到stderr和debug，信息到stdout使用log4j
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