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url增加参数useSSL 和时区 : jdbc:mysql://localhost:3306/mydb?useSSL=false&serverTimezone=UTC
driver变化: com.mysql.jdbc.Driver => com.mysql.cj.jdbc.Driver
常见错误提示1：
如果driver没有添加cj，则会在连接的时候出现以下错误提示：
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.
常见错误提示2：
url中如果没有设置useSSL=false，则会在连接的时候出现以下错误提示：
WARN: 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.
常见错误提示3：
url中如果没有设置serverTimezone=UTC，则会在连接的时候出现以下错误提示：
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.