問題描述：我有一個類foo.bar.Baz，我想讓Baz這個類的日志輸出到指定的日志文件中，其它的就使用默認的配置。
log4j.rootLogger=ERROR, logfile
log4j.appender.logfile=org.apache.log4j.DailyRollingFileAppender log4j.appender.logfile.datePattern='-'dd'.log' log4j.appender.logfile.File=log/radius-prod.log log4j.appender.logfile.layout=org.apache.log4j.PatternLayout log4j.appender.logfile.layout.ConversionPattern=%-6r %d{ISO8601} %-5p %40.40c %x - %m\n log4j.logger.foo.bar.Baz=DEBUG, myappender log4j.additivity.foo.bar.Baz=false log4j.appender.myappender=org.apache.log4j.DailyRollingFileAppender log4j.appender.myappender.datePattern='-'dd'.log' log4j.appender.myappender.File=log/access-ext-dmz-prod.log log4j.appender.myappender.layout=org.apache.log4j.PatternLayout log4j.appender.myappender.layout.ConversionPattern=%-6r %d{ISO8601} %-5p %40.40c %x - %m\n
問題來源：log4j: Log output of a specific class to a specific appender
解決辦法 By Maurice Perry