Mybatis自动生成代码提示"Cannot obtain primary key"和“ The server time zone value '�' is unrecognized or ”解决方案

Cannot obtain primary key information from the database,generated objects may be incomplete
翻译：无法从数据库中获取主键信息，生成的对象可能不完整

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.

翻译：服务器时区值' й '无法识别或代表多个时区。 如果要使用时区支持，则必须配置服务器或JDBC驱动程序（通过serverTimezone配置属性）以使用更具体的时区值。

<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
	connectionURL="jdbc:mysql://39.106.193.131:3306/carproject"
	userId="root" password="123456">
</jdbcConnection>

<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
	connectionURL="jdbc:mysql://39.106.193.131:3306/carproject?serverTimezone=UTC "
	userId="root" password="123456">
</jdbcConnection>

jdbcUrl=jdbc:mysql://localhost:3306/spring?serverTimezone=UTC&characterEncoding=utf-8

jdbcUrl=jdbc:mysql://localhost:3306/spring?serverTimezone=UTC&characterEncoding=utf-8