1.Collections对List集合中的数据进行排序
http://blog.csdn.net/veryisjava/article/details/51675036
2.Java随机数
http://blog.csdn.net/u013905744/article/details/73480674
3.mybatis javaEnumHandler
https://segmentfault.com/a/1190000010755321
4.Transactional propagation
https://www.cnblogs.com/interfacehwx/p/6517892.html