Session级别的一级缓存
SessionFactory级别的二级缓存
http://blog.csdn.net/woshichenxu/article/details/586361
http://www.blogjava.net/tbwshc/articles/380013.html
http://elf8848.iteye.com/blog/805351
http://wenwen.sogou.com/z/q188348800.htm
http://zhidao.baidu.com/link?url=tDVrEgzvT0_GjzHbv11LsZgHBIBKYi6SBuSLY9RF1_mAG7SwniJOy6NBzcinI8qVeio2vkcoUHYE0OmLxHV4hq