异常描述

Exception in thread "main" 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.

JDBC连接mysql 用的是.connector.6.0.jar 

问题解决：

String url = "jdbc:mysql://localhost:3306/zdx?serverTimezone=UTC";

在url后面加上?serverTimezone=UTC 

如下：

String url = "jdbc:mysql://localhost:3306/zdx?serverTimezone=UTC";

提示：Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

这个问题不算错误，只是友好提示，如果不想要，在6.0的jar里，mysql可以自动加载驱动，

也即是

Class.forName("com.mysql.jdbc.Driver");这句话注释掉就不会再出现这个提示。