springframework4.2怎么配置log4j2

log4j2已经配置成功 通过代码可以输出日志文件. 怎么配置才能让springframework4.2的日志也能输出

http://blog.csdn.net/orclight/article/details/8558853

http://blog.csdn.net/lin062854/article/details/9124731