Unknown initial character set index '255' received from server. Initial client character set can be
原因是MySQL版本高，mysql的jar版本低造成mysql与jar的编码错乱引起的，我的MYSQL版本是8.0.11 首先把修改项目连接mysql的url，在最后加上 ?useUnicode=true&characterEncoding=utf8 然后修改Mysql的jar包的版本： 把5.0.4修改为5.1.46或者更高版本：
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- 1. Unknown initial character set index ‘255‘ received from server. Initial client character set can be
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