xxxMapper.xml文件的头部配置

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"        "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.offcn.Mapper.MUserMapper">    <select id="getUserList" resultType="com.offcn.POJO.MUser">   　　 select * from user  　</select></mapper>

来源：https://www.cnblogs.com/cjh-code/p/11800937.html