Attribute "resource" must be declared for element type "mapper".

Mybatis项目配置别名时配置文件遇到的问题

遇到如下问题：Attribute "resource" must be declared for element type "mapper".

解决方案：mybatis 的dtd 文件配置有误

正确的应该是：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-config.dtd"> 
<configuration>
<typeAliases>
  <typeAlias type="com.entity.User" alias="user"/>
 </typeAliases>
<!-- 映射文件，存放sql语句的配置文件 -->
 <mappers>
<mapper resource="com/mybatis/demo/mapper/UserDao.xml" />
</mappers>
</configuration>

应该是configuration

这样写之后就不会再报之前那个错误了