xml中使用foreach遍历对象

如果是一个带数据的List对象

<select id="selectProductMSTList" resultType="java.util.Map"  parameterType="map">
    SELECT
         <foreach collection="fields" item="field" index="index" close=""  separator=",">
            #{field.tablekoumokuNames,jdbcType=VARCHAR}
        </foreach>    
    FROM
        ${temp}.m_product
    LEFT  JOIN ${temp}.m_type_cd ON ${temp}.m_product.product_group_cd = ${temp}.m_type_cd.type_cd
    WHERE
        ${temp}.m_product.anken_id = #{ankenId,jdbcType=VARCHAR} AND
        ${temp}.m_product.subsidiary_cd = #{subsidiaryCd,jdbcType=VARCHAR} AND
        ${temp}.m_product.sub_anken_id = #{subAnkenId,jdbcType=VARCHAR}
    ORDER BY
        ${temp}.m_product.subsidiary_cd ASC,
        ${temp}.m_product.brand_cd ASC,
        ${temp}.m_product.product_cd ASC
</select>

 遍历一个map对象：

Map<String,Object> xx=new HashMap<String, Object>();
xx.put("22","ABC");

paramMap.put("maps",xx);

        <foreach collection="maps" item="field" index="key" separator=",">
              ${field}={key}
        </foreach>