shop--10.前端展示系统--首页展示（后台）

 初始的首页

 首先获取首页中头条展示内容的List

然后还要获取一级店铺类别，用来将店铺分类展示

Dao层

获取头条信息

/**
     * 通过传入的查询条件，查询头条信息
     * @param headLineCondition
     * @return
     */
    List<HeadLine> queryHeadLine(@Param( "headLineCondition" ) HeadLine headLineCondition);

　　

<select id="queryHeadLine" resultType="com.shop.bean.HeadLine">
        SELECT
        line_id,
        line_name,
        line_link,
        line_img,
        priority,
        status,
        create_time,
        last_edit_time
        FROM
        head_line
        <where>
            <if test="headLineCondition.status != null">
                and status=#{headLineCondition.status}
            </if>
        </where>
        ORDER BY
        priority DESC
    </select>

　　

获取店铺类别信息

/**
     * 获取店铺类别
     * @param shopCategoryCondition
     * @return
     */
    List<ShopCategory> queryShopCategory(@Param("shopCategoryCondition") ShopCategory shopCategoryCondition);

　　

<select id="queryShopCategory" resultType="com.shop.bean.ShopCategory">
        SELECT
        shop_category_id,
        shop_category_name,
        shop_category_desc,
        shop_category_img,
        priority,
        create_time,
        last_edit_time,
        parent_id
        FROM shop_category
        <where>
            <if test="shopCategoryCondition == null">
                AND parent_id IS NULL
            </if>
            <if test="shopCategoryCondition != null">
                AND parent_id IS NOT NULL
            </if>
            <if test="shopCategoryCondition != null and shopCategoryCondition.parent != null">
                AND parent_id = #{shopCategoryCondition.parent.shopCategoryId}
            </if>
        </where>
        ORDER BY
        priority DESC
    </select>

　　

Service层

头条信息

/**
     * 根据查询条件返回头条列表
     * @param headLineCondition
     * @return
     */
    List<HeadLine> getHeadLineList(HeadLine headLineCondition);

　　

public List<HeadLine> getHeadLineList(HeadLine headLineCondition) {
        return headLineDao.queryHeadLine( headLineCondition );
    }

　　

店铺类别

/**
     * 根据查询条件获取店铺类别列表
     * @param shopCategoryCondition
     * @return
     */
    List<ShopCategory>getShopCategoryList(ShopCategory shopCategoryCondition);

　　

public List<ShopCategory> getShopCategoryList(ShopCategory shopCategoryCondition) {
        return shopCategoryDao.queryShopCategory( shopCategoryCondition );
    }

　　

Controller层

/**
     * 初始化前端展示系统信息，包括一级店铺类别列表信息和头条列表
     * @return
     */
    @RequestMapping(value="/listmainpageinfo", method= RequestMethod.GET)
    @ResponseBody
    private Map<String, Object> listMainPageInfo(){
        Map<String, Object> modelMap = new HashMap<>();

        List<ShopCategory> shopCategoryList = new ArrayList<>();

        try{
            //传入null时（parentId为null），获取的时一级店铺类别
            shopCategoryList = shopCategoryService.getShopCategoryList( null );
            modelMap.put( "shopCategoryList", shopCategoryList );
        }catch(Exception e){
            modelMap.put( "success", false );
            modelMap.put( "errMsg", e.toString() );
            return modelMap;
        }

        List<HeadLine> headLineList = new ArrayList<>(  );
        try{
            //获取 status == 1 的头条列表，用于在首页的头条展示
            HeadLine headLineCondition = new HeadLine();
            headLineCondition.setStatus( 1 );
            headLineList = headLineService.getHeadLineList( headLineCondition );
            modelMap.put( "headLineList", headLineList );
        } catch(Exception e){
            modelMap.put( "success", false );
            modelMap.put( "errMsg", e.toString() );
            return modelMap;
        }

        modelMap.put( "success", true );
        return modelMap;
    }