log4j和log4j2的功能及形式对比
http://blog.csdn.net/fangaohua200/article/details/53561718
log4j2的proptise配置
http://blog.csdn.net/caib1109/article/details/51407091
log4j按包打日志
http://blog.csdn.net/drift_away/article/details/7403658
log4j配置的详细说明
http://blog.csdn.net/dr_guo/article/details/50718063
log4j同时按时间和大小分割的自写继承
http://blog.csdn.net/iamlihongwei/article/details/56277797