Unknown initial character set index '255' received from server. Initial client character set 解决方法

错误信息：
Unknown initial character set index ‘255’ received from server. Initial client character set can be forced via the ‘characterEncoding’ property.

解决方法：
在mybatis配置文件中将 jdbc:mysql://localhost:3306/ssm
改为：jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=utf8

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原文链接：https://blog.csdn.net/weixin_44048050/article/details/102888296