关于字符集报错显示“255”Unknown initial character set index '255' received from server.

在连接数据库时出现这样的问题
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.
解决方案：

第一眼看到包含255字样，一想应该是字符集不合适，随后检查之后是没有设置字符集，
因此在URL路径 后面输入

?useUnicode=true&characterEncoding=utf8;

便可以成功运行