本文详细介绍了Log4j的日志级别设置及配置方法，包括如何调整rootCategory的日志级别为DEBUG，以及对特定异常类别的日志记录进行特殊处理。此外，还提供了ConsoleAppender和RollingFileAppender的具体配置示例，帮助读者更好地理解如何实现文件滚动和备份。
log4j.rootCategory=DEBUG,stdout,R# Set the level to DEBUG if you want to log all SlideExceptions (some of them aren't errors)log4j.category.org.apache.slide.common.SlideException=FATAL########################################log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayout# Pattern to output the caller's file name and line number.#log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n#log4j.appender.stdout.layout.ConversionPattern=%4p [%t] %c - %m%n
log4j.appender.stdout.layout.ConversionPattern=[%t] %-5p %-20c{2} - %m %n
log4j.appender.stdout.layout.ConversionPatternlog4j.appender.R=org.apache.log4j.RollingFileAppenderlog4j.appender.R.File=logger.loglog4j.appender.R.ImmediateFlush=truelog4j.appender.R.MaxFileSize=100KB# Keep one backup filelog4j.appender.R.MaxBackupIndex=1log4j.appender.R.layout=org.apache.log4j.PatternLayout#log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n#log4j.appender.R.layout.ConversionPattern=%4p [%t] %c - %m%nlog4j.appender.R.layout.ConversionPattern=%d{ABSOLUTE} [%t] %-5p %-30c{3} %x - %m %n
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