com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

 

 只需要把这个 useSSL改为false 就可以了 驱动driverClassName: com.mysql.cj.jdbc.Driver 或者 driverClassName: com.mysql.jdbc.Driver  这个会有一个提示信息（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.）