The server time zone value ‘� й ��� ׼ʱ ��‘ is unrecognized or represents more than one time zone.

解决方式一

jdbc:mysql://localhost:3306/jdbc01?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false";//链接的mysql
        在jdbc连接的url后面加上serverTimezone=GMT即可解决问题，如果需要使用gmt+8时区，需要写成GMT%2B8
————————————————
版权声明：本文为优快云博主「君_陌」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.youkuaiyun.com/secretstarlyp/article/details/92852861

解决方式二

1.String url = "jdbc:mysql://localhost:3306/crashcourse?serverTimezone=UTC

mysql> set global time_zone='+8:00';

2. set character_set_results='utf8mb3';

The server time zone value ‘� й ��� ׼ʱ ��‘ is unrecognized or represents more than one time zone. (basic version)https://copyfuture.com/blogs-details/202204051019426845