//前端显示商品列表，并按照一定的顺序排序@Overridepublic ServerResponse<PageInfo> getPortalProductList(Integer categoryId, String keyword, String orderBy, Integer pageNum, Integer pageSize) {if (StringUtils.isBlank(keyword) && categoryId == null) {return ServerResponse.createByErrorCodeMessage(ResponseCode.ILLEGAL_ARGUMENT.getCode(), ResponseCode.ILLEGAL_ARGUMENT.getDesc());}List<Integer> categoryIdList = Lists.newArrayList();//这里需要根据商品id来判断这个类别是否存在，如果分类不存在，则返回给前台一个空即可if (categoryId != null) {mmall_category category = categoryMapper.selectByPrimaryKey(categoryId);if (category == null && StringUtils.isBlank(keyword)) {//如果分类为空，则返回该类别为空的结果集，不报错PageHelper.startPage(pageNum, pageSize);List<ProductListVo> list = Lists.newArrayList();PageInfo info = new PageInfo(list);return ServerResponse.createBySuccess(info);}//商品展示的时候，当我们在搜索某一类商品的时候，它会有很多子类，比如手机类别，有华为型号的，华为型号下面又有很多子类，所以递归函数来调用categoryIdList = categoryService.getDeepCategory(category.getId()).getData();}//接下来判断关键字是否为空if (keyword != null) {keyword = new StringBuilder().append("%").append(keyword).append("%").toString();}//排序处理PageHelper.startPage(pageNum, pageSize);/* if (StringUtils.isNotBlank(orderBy)){//分页的排序if (Const.ProductListOrderBy.PRICE_ASC_DESC.contains(orderBy)){//进行分割String[] orderArray=orderBy.split("_");//排序PageHelper.orderBy(orderArray[0]+" "+orderArray[1]);}}*/List<mmall_product> productList = productMapper.selectProtalProduct(StringUtils.isBlank(keyword) ? null : keyword, categoryIdList.size() == 0 ? null : categoryIdList);List<ProductListVo> productListVoList = Lists.newArrayList();if (!CollectionUtils.isEmpty(productList)) {for (mmall_product product : productList) {ProductListVo productListVo = this.productConvertVo(product);productListVoList.add(productListVo);}}PageInfo info = new PageInfo(productListVoList);return ServerResponse.createBySuccess(info);}

//这里递归获取子节点，即当前节点下的所以子节点以及子节点的节点都要列出@Overridepublic ServerResponse<List<Integer>> getDeepCategory(Integer categoryId) {Set<mmall_category> categorySet= Sets.newHashSet();//这是guava缓存的技巧//在这里进行初始化Set集合findChildrenCategory(categorySet,categoryId);List<Integer> list= Lists.newArrayList();if (categoryId!=null){for (mmall_category categoryItem:categorySet) {list.add(categoryItem.getId());}}return ServerResponse.createBySuccess(list);}//递归代码的实现public Set<mmall_category> findChildrenCategory(Set<mmall_category> categorySet,Integer categoryId){mmall_category category=mmall_categoryMapper.selectByPrimaryKey(categoryId);if (category!=null){categorySet.add(category);}//categorySet其实是用来存储这些列表数据的//查找子节点递归函数必须有一个终止条件List<mmall_category> categoryList=mmall_categoryMapper.selectCategoryByParentId(categoryId);for (mmall_category categoryItem: categoryList) {findChildrenCategory(categorySet,categoryItem.getId());}return categorySet;}