JAVA编码（4）——JAVA打印日志Logger处理

log4j.properties配置文件中：​（注意标红的行，只有定义在com.sinosoft下执行logger.info，才能够执行打印日志）

log4j.rootLogger=ERROR, stdout,df

# MyBatis logging configuration...

log4j.logger.com.sinosoft=info

log4j.logger.abc=debug

# Console output...

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss} %5p [%F\:%L] %c{8}.%M() - %m%n

log4j.appender.df=org.apache.log4j.DailyRollingFileAppender

log4j.appender.df.file=E:/test.log

log4j.appender.df.layout=org.apache.log4j.PatternLayout

log4j.appender.df.layout.ConversionPattern=%d{yyyy-MM-dd HH\:mm\:ss} %5p [%F\:%L] %c{8}.%M() - %m%n​

===================================================Java类中：​

private Logger logger = Logger.getLogger(TestMysql.class);​

例如：​

try {

              connection.rollback();

} catch (SQLException e1) {

             logger.info("事务回滚失败,请核查：" + e1.getLocalizedMessage());

             e1.printStackTrace();

}