在mysql6之后，通过jdbc连接MySQL时，如果未设置时区会报如下错误：
1 | The server time zone value '???ú±ê×??±??' 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. |
此时可修改MySQL连接设置时区为北京时间：
1 | url=jdbc:mysql://localhost:3306/test?serverTimezone=Asia/Shanghai&?useUnicode=true&characterEncoding=utf8&useSSL=false |
