通过断点调试捕获错误消息：The server time zone value '�й���ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
解决方案：为URL添加参数serverTimezone=UTC即可，这里的时区可以根据自己数据库的设定来设置（GMT/UTC ）。
jdbc:mysql://localhost:3306/demo?useSSL=false&useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
参考文章：http://www.cnblogs.com/jeffen/p/6288142.html