### set log levels ### ### debug (打印代码中logger.debug(xx)的信息)> info(打印代码中logger.info(xx)的信息) log4j.rootLogger = info , C , D , E ### console ### log4j.appender.C = org.apache.log4j.ConsoleAppender log4j.appender.C.Target = System.out log4j.appender.C.l…