mysql中Incorrect string value乱码问题解决方案　　https://my.oschina.net/lixin91/blog/639270

DruidDataSource配置属性列 https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE%E5%B1%9E%E6%80%A7%E5%88%97%E8%A1%A8