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Unknown 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/mybatis" 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/mybatis?useUnicode=true&characterEncoding=utf8";//改成这句，就可以了
最终解决方法：
删除 \WebContent\WEB-INF\lib目录下的。mysql-connector的jar文件。原因是：MySQL驱动和数据库字符集设置不搭配
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