[Java知识库]Mybatis报错：java.io.IOException: Could not find resource com/yd/mapper/UserMapper.xml

按照网上教程搭建mybatis开发环境，我的本地目录如下：

?其中测试的映射文件位置在com.yd.mapper.UserMapper.xml中

内容如下

<?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为映射的根节点，namespace指定Dao接口的完整类名   
 mybatis会依据这个接口动态创建一个实现类去实现这个接口， 而这个实现类是一个Mapper对象-->
<mapper namespace="com.yd.mapper.UserMapper">
    <!--    根据id查找一个用户信息-->
    <!--    “#{}”表示一个占位符，相当于“?”，而“#{id}”表示该占位符待接收参数的名称为id-->
    <select id="selectUserByID" parameterType="Integer" 
                                resultType="com.yd.pojo.User">
        select *
        from user
        where id = #{id}
    </select>
    <!--查询所有用户信息    -->
    <select id="selectAllUser" resultType="com.yd.pojo.User">
        select *
        from user
    </select>
    <!--    添加一个用户-->
    <insert id="addUser" parameterType="com.yd.pojo.User">
        insert into user (name, sex)
        values (#{name}, #{sex})
    </insert>
    <update id="updateUser" parameterType="com.yd.pojo.User">
        update user
        set name=#{name},
            sex=#{sex}
        where id = #{id}
    </update>
    <!--    删除一个用户-->
    <delete id="deleteUser" parameterType="Integer">
        delete
        from user
        where id = #{id}
    </delete>
</mapper>

MyBatis的配置文件如下

<?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>
    <!-- 环境配置 -->
    <environments default="development">
        <environment id="development">
<!--            使用jdbc的事务管理-->
            <transactionManager type="JDBC"/>
<!--        数据库连接相关配置 ,这里动态获取config.properties文件中的内容;
            UNPOOLED：不使用连接池的数据源
            POOLED  ：使用连接池的数据源
            JNDI    ：使用JNDI实现的数据源-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/test?serverTimezone=UTC&amp;characterEncoding=utf-8" />
                <property name="username" value="root" />
                <property name="password" value="root" />
            </dataSource>
        </environment>
    </environments>
    <!-- mapping文件路径配置 -->
    <mappers>
        <mapper resource="com/yd/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

报错信息如下：

Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource com/yd/mapper/UserMapper.xml
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:122)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:99)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:78)
	... 2 more
Caused by: java.io.IOException: Could not find resource com/yd/mapper/UserMapper.xml
	at org.apache.ibatis.io.Resources.getResourceAsStream(Resources.java:114)
	at org.apache.ibatis.io.Resources.getResourceAsStream(Resources.java:100)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:377)
	at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:120)
	... 4 more

原因是视频教程是用Eclipse,而我本地用的是idea，idea不会编译src的java目录的xml文件

解决：在pom.xml中添加build

<build>
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>com/yd/mapper/*.xml</include>
        </includes>
      </resource>
    </resources>
  </build>

再次执行，已不报错