报错内容：java.sql.SQLException: 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.
这是MySQL默认时区引起的问题。解决办法：连接MySQL设置默认时区：
url: jdbc:mysql://localhost:3306/mybatis_test?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8