1、自定义HttpSession实现Session
https://www.cnblogs.com/youzhibing/p/7348337.html
2、Spring整合Jedis2.9(集群带密码版)
https://blog.csdn.net/cslucifer/article/details/78586809
3、Spring Session解决分布式Session问题的实现原理
https://blog.csdn.net/xlgen157387/article/details/60321984
4、使用Redis存储Nginx+Tomcat负载均衡集群的Session
https://blog.csdn.net/xlgen157387/article/details/52024139
综合1,2,3,4可以实现分布式session