解决方法：
?useUnicode=true&characterEncoding=utf-8
在url路径上加上这句话
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java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.解决方案
Unknown initial character set index '255' received from server. Initial client character set can be
Unknown initial character set index '255' received from server. Initial client character 解决方法
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