mysql的连接错误，在网上查找到是编码不匹配的原因，
直接在连接的URL后加上?useUnicode=true&characterEncoding=utf8就可以了
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Unknown initial character set index '255' received from server. Initial client character 解决方法
Exception in thread "main" java.sql.SQLException: Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
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
Unknown character set index for field '255' received from server.
关于Javaweb中报错信息Cause: java.sql.SQLException: Unknown initial character set index '255' received from server.解决办法
【java报错】Unknown character set index for field '224' received from server.
mysql: unknown variable 'character-set-client=utf8'
character_set_server 不能修改
character_set_connection、character_set_results、 character_set_client的作用