Log4j最佳实践

参考：http://www.cnblogs.com/Mainz/p/3628414.html

http://www.oschina.net/translate/asynchronous-logging-using-log4j-activemq-and-spring?p=2#comments

http://zhanghua.1199.blog.163.com/blog/static/464498072012112142121681/

http://stackoverflow.com/questions/3537870/production-settings-file-for-log4j/

http://www.cnblogs.com/softidea/p/4242528.html