log4j的log4j.properties文件配置

放在类路径根目录 为hibernate框架使用

###direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %5p %c{1}:%m%n

### set log levels - for more verbose logging change
### 'info' to 'debug'
log4j.rootLogger=warn, stdout
log4j.logger.org.hibernate=warn