原因是少一个参数，设置时区的。
解决方法：
加一个参数：
serverTimezone=UTC
jdbc:mysql://localhost:3306/SshProject?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
解决idea中mysql连接失败Could not create connection to database server. Attempted reconnect 3 times. Giving up.
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