mysql8版本连接错误问题汇总：
问题一
java.sql.SQLException: The server time zone value ‘Öйú±ê׼ʱ¼ä’ 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.
这需要指定时区配置参数serverTimezone：比如可以在连接url后面添加，样例如下： jdbc:mysql://localhost:3306/javaee?useSSL=false&serverTimezone=Asia/Shanghai
问题二
Establishing SSL connection without server’s identity verification is not recommended. According to MySQL 5.5.45 , 5.6.26 and 5.7.6 requirements SSL connection must be established by default if explicit option isn’t set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to ‘false’. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
意思是从 5.5.45 , 5.6.26 and 5.7.6 开始后面的版本，需要使用SSL配置，当然也可以不使用，加上连接参数useSSL=false即可，样例如下：
jdbc:mysql://localhost:3306/javaee?useSSL=false&serverTimezone=Asia/Shanghai
