问题描述：
java.sql.SQLException: Unknown initial character set index '255' received from server.
Initial client character set can be forced via the 'characterEncoding' property.
原因分析：
MySQL驱动和数据库字符集设置不搭配
解决方案：
添加 ?useUnicode=true&characterEncoding=utf8
"jdbc:mysql:///maven02?useUnicode=true&characterEncoding=utf8","用户名","密码")
成功解决
