log4j.properties，通常配置：

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log4j.properties，通常配置：（网上流传大多有问题，特声明一下）

 ### set log levels ###log4j.rootLogger = debug, stdout, D, E### console ###log4j.appender.stdout = org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target = System.outlog4j.appender.stdout.layout = org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern = [%5p] [%-d{yyyy-MM-dd HH:mm:ss}] [%t] (%F:%L) -%m%n### debug file ###log4j.appender.D = org.apache.log4j.DailyRollingFileAppenderlog4j.appender.D.File=${catalina.home}/logs/kepu925.loglog4j.appender.D.DatePattern='.'yyyy-MM-dd'.log'log4j.appender.D.Append = truelog4j.appender.D.Threshold = DEBUGlog4j.appender.D.layout = org.apache.log4j.PatternLayoutlog4j.appender.D.layout.ConversionPattern = [%5p] [%-d{yyyy-MM-dd HH:mm:ss}] [%t] (%F:%L) -%m%n### error for sigle file ###log4j.appender.E = org.apache.log4j.DailyRollingFileAppenderlog4j.appender.E.File=${catalina.home}/logs/kepu925_error.loglog4j.appender.E.DatePattern='.'yyyy-MM-dd'.log'log4j.appender.E.Append = truelog4j.appender.E.Threshold = ERRORlog4j.appender.E.layout = org.apache.log4j.PatternLayoutlog4j.appender.D.layout.ConversionPattern = [%5p] [%-d{yyyy-MM-dd HH:mm:ss}] [%t] (%F:%L) -%m%n