解決方案：
- 首先查看數據庫的版本號，刪除舊的jar包，將mysql-connector-java.jar更換成對應版本號
- 同時在連接數據庫的url后加上
?useUnicode=true&characterEncoding=utf-8
java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.解決方案
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