1.对应的xml文件：

<!--批量添加-->
<insert id="insertStandardItemInfo" parameterType="hashmap">
  insert into t_standard_item(standard_id,item_id)
  values
  <foreach collection="itemIdList" index="index" item="item"  separator="," >
    (#{standardId,jdbcType=INTEGER}, #{item,jdbcType=INTEGER})
  </foreach>
</insert>

2.对应的mapper文件：

int insertStandardItemInfo(Map<String,Object> map);

3.对应的service文件：

Map<String, Object> map = new HashMap<>();
map.put("standardId", standardId);
map.put("itemIdList", itemIdList);
standardItemMapper.insertStandardItemInfo(map);

Mybatis批量添加对象List