mysql连接异常：The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zo错误

错误原因：mysql识别时区出现错误，这是因为访问的url中没有指定时区为UTC

出错误的url:

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/springbootdemo?useUnicode=true&characterEncoding=utf8

在后面添加时区的参数数即可：

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/springbootdemo?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC