1java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.

很多人说是在url后拼接encoding 但是没有作用 最后原因是mysql版本高 链接驱动jar包版本低 换成高版本就可以了mysql-connector-java-8.0.15就可以了 然后有出现时区报错

java.sql.SQLException: The server time zone value '???ú±ê×??±??' is unrecognized or represents more

在url后面添加时区就可以了 mysql://127.0.0.1:3306/db_indoorposition?serverTimezone=GMT+8