Mysql8 :Could not create connection to database server.

更新mysql-connector-java版本：

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.19</version>
</dependency>

更换驱动

com.mysql.cj.jdbc.Driver

更改时区：

set global time_zone='+8:00';

或者数据库连接的时候设置

serverTimezone=GMT%2B8