原因是少一個參數，設置時區的。
解決方法：
加一個參數：
serverTimezone=UTC
jdbc:mysql://localhost:3306/SshProject?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
解決idea中mysql連接失敗Could not create connection to database server. Attempted reconnect 3 times. Giving up.
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