nknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.

从错误的提示信息中发现字符集设置出现问题

mysql连接数据库时报此错误：

//String url = "jdbc:mysql://localhost:3306/db_cjky" 如果使用这句就会报错。
//Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property.
String url = "jdbc:mysql://localhost:3306/db_cjky?useUnicode=true&characterEncoding=utf8";//改成这句，就可以了
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原文链接：https://blog.csdn.net/txwtech/article/details/80787886