Properties文件
log4j.logger.showsql=debug
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout.ConversionPattern=%d %p <%c:%L> - %m%n