商品管理模块开发

1.修改和新增商品操作

public ServerResponse saveOrUpdateProduct(Product product){
        if(product!=null){
            ``` 
            if(StringUtils.isNotBlank(product.getSubImages())) {
                String[] subImageArray = product.getSubImages().split(",");
                if (subImageArray.length > 0) {
                    product.setMainImage(subImageArray[0]);
                }
            ```
            if(product.getId()!=null){
                int resultCount = productMapper.updateByPrimaryKey(product);
                if(resultCount>0){
                    return ServerResponse.createBySuccessMessage("更新商品成功");
                }else{
                    return ServerResponse.createByErrorMessage("更新商品失败");
                }
            }else{
                int resultCount = productMapper.insertSelective(product);
                if(resultCount>0){
                    return ServerResponse.createBySuccessMessage("新增商品成功");
                }else{
                    return ServerResponse.createByErrorMessage("新增更新商品失败");
                }
            }
        }
        return ServerResponse.createByErrorMessage("新增或更新产品参数不正确");
    }

2.产品详情页管理
配置内容都是用properties文件统一编写，便于前后端分离，以及后期的维护，同时这样也更方便于进行热部署。

    public ServerResponse<ProductDetailVo> manageProductDetail(Integer productId){
        if(productId==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.ILLEGAL_ARGUMENT.getCode(),ResponseCode.ILLEGAL_ARGUMENT.getDesc());
        }
        Product product=productMapper.selectByPrimaryKey(productId);
        if(product==null){
            return ServerResponse.createByErrorMessage("产品已经下架或删除");
        }
        ProductDetailVo productDetailVo=assembleProductDetailVo(product);
        return ServerResponse.createBySuccess(productDetailVo);
    }

    private ProductDetailVo assembleProductDetailVo(Product product){
        ProductDetailVo productDetailVo=new ProductDetailVo();
        productDetailVo.setId(product.getId());
        productDetailVo.setSubtitle(product.getSubtitle());
        productDetailVo.setPrice(product.getPrice());
        productDetailVo.setMainImage(product.getMainImage());
        productDetailVo.setSubImage(product.getSubImages());
        productDetailVo.setCategoryId(product.getCategoryId());
        productDetailVo.setDetail(product.getDetail());
        productDetailVo.setName(product.getName());
        productDetailVo.setStatus(product.getStatus());
        productDetailVo.setStock(product.getStock());

        productDetailVo.setImageHost(PropertiesUtil.getProperty("ftp.server.http.prefix","http://img.happymmall.com/"));

        //ImageHost
        Category category = categoryMapper.selectByPrimaryKey(product.getCategoryId());
        if(category==null){
            productDetailVo.setParentCategoryId(0);//默认根节点 根节点内容为空
        }else{
            productDetailVo.setParentCategoryId(category.getParentId());
        }

        //createTime
        productDetailVo.setCreateTime(DateTimeUtil.dateToStr(product.getCreateTime()));
        productDetailVo.setUpdateTime(DateTimeUtil.dateToStr(product.getUpdateTime()));
        return productDetailVo;
    }

3.商品列表动态功能开发

这里需要使用分页工具pageHelper，每页显示数量，以及页码。

  <select id="selectList" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List"/>
    from mmall_product
    ORDER BY id ASC   
#通常在后面见加上分号,但是切面时会加上limit关键字分页，就会报错
  </select>

这里使用vo来存储所需要显示的部分，对于库存，子图等不予展示

public ServerResponse getProductList(int pageNum,int pageSize){
        PageHelper.startPage(pageNum,pageSize);
        List<Product>  product_list=productMapper.selectList();

        List<ProductListVo> productVoList = Lists.newArrayList();
        for(Product product:product_list) {
            ProductListVo productDetailVo = assembleProductListVo(product);
            productVoList.add(productDetailVo);
        }
        PageInfo pageResult=new PageInfo(product_list);
        pageResult.setList(productVoList);
        return ServerResponse.createBySuccess(pageResult);
    }

    //装配成为指定值对象
    public ProductListVo assembleProductListVo(Product product){
        ProductListVo productListVo=new ProductListVo();
        productListVo.setName(product.getName());
        productListVo.setId(product.getId());
        productListVo.setCategoryId(product.getCategoryId());
                    productListVo.setImageHost(PropertiesUtil.getProperty("ftp.server.http.prefix","http://img.happymmall.com/"));
        productListVo.setMainImage(product.getMainImage());
        productListVo.setPrice(product.getPrice());
        productListVo.setSubtitle(product.getSubtitle());
        productListVo.setStatus(product.getStatus());

        return productListVo;
    }

4.商品搜索功能
根据商品名和id来搜索，或者其中之一，mybatis编写sql语句时注意，where和if条件的使用方法，where可以代替诸如：where 1=1之类的硬编码，智能的替换AND关键字，保证sql语句的正确执行，更美观，扩展性更好。

<select id="selectByNameAndProductId" resultMap="BaseResultMap" parameterType="map">
    SELECT
    <include refid="Base_Column_List"/>
    FROM mmall_product
    <where>
      <if test="productName!=null">
        AND productName LIKE #{productName}
      </if>
      <if test="productId!=null">
        and productId=#{productId}
      </if>
    </where>
  </select>

业务实现：

    public ServerResponse<PageInfo> searchProduct(String productName,Integer productId,int pageNum,int pageSize){
        PageHelper.startPage(pageNum,pageSize);
        if(StringUtils.isNotBlank(productName)){
            productName=new StringBuilder().append("%").append(productName).append("%").toString();
        }
        List<Product> productList = productMapper.selectByNameAndProductId(productName,productId);
        List<ProductListVo> productListVoList = Lists.newArrayList();
        for(Product product:productList) {
            ProductListVo productListVo = assembleProductListVo(product);
            productListVoList.add(productListVo);
        }
        PageInfo pageResult=new PageInfo(productList);
        pageResult.setList(productListVoList);
        return ServerResponse.createBySuccess(pageResult);

    }

5.普通用户通过关键字和分类搜索商品

Mybatis ProductMapper.java定义如下：

List<Product> selectByNameAndProductIds(@Param("productName") String productName, @Param("categoryIdList") List<Integer> categoryIdList);

Mybatis ProductMapper.xml定义如下：

<select id="selectByNameAndProductIds" resultMap="BaseResultMap" parameterType="map">
    SELECT
    <include refid="Base_Column_List"/>
    FROM mmall_product
    <where>
      <if test="productName!=null">
        AND productName LIKE #{productName}
      </if>
      <if test="productIdList!=null">
        and category_id in
        <foreach collection="categoryIdList" index="index" item="item" open="(" separator="," close=")">
          #{item}
        </foreach>
      </if>
    </where>
  </select>

业务层实现代码：

    public ServerResponse<PageInfo> getProductByKeywordCategory(String keyword,Integer categoryId,int pageNum,int pageSize,String orderBy){

        if(StringUtils.isBlank(keyword) && categoryId==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.ILLEGAL_ARGUMENT.getCode(),ResponseCode.ILLEGAL_ARGUMENT.getDesc());
        }
        List<Integer> categoryIdList=new ArrayList<Integer>();
        if(categoryId!=null){
            Category category=categoryMapper.selectByPrimaryKey(categoryId); 
            if(StringUtils.isNotBlank(keyword) && category==null){
                //没有该分类并且还没有该关键字 则返回一个空结果集
                PageHelper.startPage(pageNum,pageSize);
                List<ProductListVo> productListVoList = Lists.newArrayList();
                PageInfo pageResult=new PageInfo(productListVoList); //空结果集不需要用setList转换
                return ServerResponse.createBySuccess(pageResult);
            }
            //获取CategoryIdList service平级调用service
            iCategoryService.selectCategoryAndChildrenById(category.getId()).getData();
        }
        if(StringUtils.isNotBlank(keyword)){
            keyword=new StringBuilder().append("%").append(keyword).append("%").toString();
        }
        PageHelper.startPage(pageNum,pageSize);
        //动态排序
        if(StringUtils.isNotBlank(orderBy)){
            if(Const.ProductListOrderBy.PRICE_ASC_DESC.contains(orderBy)){ //在Const中定义排序的枚举类
                String[] orderByArray=orderBy.split("_");  //与前端约定 用下划线_隔开类别和排序方式
                PageHelper.orderBy(orderByArray[0]+" "+orderByArray[1]);
            }
        }
        List<Product> productList = productMapper.selectByNameAndProductIds(
                (StringUtils.isBlank(keyword))?null:keyword,categoryIdList.size()==0?null:categoryIdList);
        //构建ListVO
        List<ProductListVo> productListVoList=Lists.newArrayList();
        for(Product product:productList) {
            ProductListVo productListVo = assembleProductListVo(product);
            productListVoList.add(productListVo);
        }
        PageInfo pageInfo=new PageInfo(productList);
        pageInfo.setList(productListVoList);
        return ServerResponse.createBySuccess(pageInfo);
    }

Web层部分代码：

    @RequestMapping(value="list.do")
    @ResponseBody
    //这里的方法参数是可选的，因此用@RequestParam设置一下
    public ServerResponse<PageInfo> list(@RequestParam(value = "keyword",required = false)String keyword, 
                                         @RequestParam(value = "categoryId",required = false)Integer categoryId,
                                         @RequestParam(value = "pageNum",required = false)Integer pageNum,
                                         @RequestParam(value = "pageSize",required = false)Integer pageSize,
                                         @RequestParam(value = "orderBy",required = false)String orderBy){
        return iProductService.getProductByKeywordCategory(keyword,categoryId,pageNum,pageSize,orderBy);
    }