MyBatis报错: xxx is not known to the MapperRegistry

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学习MyBatis报错:提示映射注册器并不知道某个Mapper…
原因是,没有在MyBatis的配置文件中注册这个Mapper,所以映射注册器自然不知道有这么一个映射
<mappers>
    <mapper resource="org/fkit/mapper/UserMapper.xml" />
    <mapper resource="org/fkit/mapper/PersonMapper.xml" />
    <mapper resource="org/fkit/mapper/CardMapper.xml" />
</mappers>