项目结构

由于想把mybatis的mapper文件和dao层放到一起所以在pom中添加了

所以编译时会忽略resources文件中的配置文件，所以pom.xml的标签中修改为

<!--指定mapper存放路径-->
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--指定配置文件存放路径-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
    </resources>