项目中技术总结，项目技术总结

  Access-Control-Allow-Origin:*
  Access-Control-Allow-Methods:POST
  Access-Control-Allow-Headers:x-requested-with,content-type 

<resultMap id="list" type="java.util.LinkedHashMap">
    <result property="name" column="name" />
    <result property="sex" column="sex" />
    <result property="age" column="age" typeHandler="com.demo.EmptyStringIfNull"/>
</resultMap>