shop--9.商品--商品编辑--修改（后端）
1.首先获取店铺下的商品信息
dao层
/**
* 由商品Id获取商品信息
* @param productId
* @return
*/
Product queryProductByproductId(Long productId);
dao.xml
要重新定义resultMap
因为返回的商品详情图片是一个List，所以要用collection来进行定义，而且在进行数据查询时，要使用多表连接的功能
<resultMap id="productMap" type="com.shop.bean.Product">
<id column="product_id" property="productId"/>
<result column="product_name" property="productName"/>
<result column="product_desc" property="productDesc"/>
<result column="img_addr" property="imgAddr"/>
<result column="normal_price" property="normalPrice"/>
<result column="promotion_price" property="promotionPrice"/>
<result column="priority" property="priority"/>
<result column="create_time" property="createTime"/>
<result column="last_edit_time" property="lastEditTime"/>
<result column="status" property="status"/>
<association column="product_category_id" property="productCategory"
javaType="com.shop.bean.ProductCategory">
<id column="product_category_id" property="productCategoryId"/>
<result column="product_category_name" property="productCategoryName"/>
</association>
<association column="shop_id" property="shop" javaType="com.shop.bean.Shop">
<id column="shop_id" property="shopId"/>
<result column="shop_name" property="shopName"/>
<result column="owner_id" property="ownerId"/>
</association>
<collection column="product_id" property="productImgList" ofType="com.shop.bean.ProductImg">
<id column="product_img_id" property="productImgId"/>
<result column="img_addr" property="imgAddr"/>
<result column="img_desc" property="imgDesc"/>
<result column="priority" property="priority"/>
<result column="create_time" property="createTime"/>
<result column="product_id" property="productId"/>
</collection>
</resultMap>
<select id="queryProductByproductId" resultMap="productMap">
SELECT
p.product_id,
p.product_name,
p.product_desc,
p.img_addr,
p.normal_price,
p.promotion_price,
p.priority,
p.create_time,
p.last_edit_time,
p.status,
p.product_category_id,
p.shop_id,
pm.product_img_id,
pm.img_addr,
pm.img_desc,
pm.priority,
pm.create_time,
pm.product_id
FROM
product p
LEFT JOIN
product_img pm
ON
p.product_id=pm.product_id
WHERE p.product_id=#{productId}
ORDER BY
pm.priority DESC
</select>
service
/**
* 由商品Id获取商品信息
* @param productId
* @return
*/
Product getProductByProductId(Long productId);
/**
* 由商品Id获取商品信息
* @param productId
* @return
*/
@Override
public Product getProductByProductId(Long productId) {
return productDao.queryProductByproductId( productId );
}
controller层
@RequestMapping(value="getproductbyid", method=RequestMethod.GET)
@ResponseBody
public Map<String, Object> getProductById(@RequestParam Long productId){
Map<String, Object> modelMap = new HashMap<>();
//Long productId = HttpServletRequestUtil.getLong( request, "productId" );
if(productId > 0){
//获取商品Id的商品信息
Product product = productService.getProductByProductId( productId );
//获取该店铺下的商品类别列表
List<ProductCategory> productCategoryList =
productCategoryService.getProductCategoryList( product.getShop().getShopId() );
modelMap.put("success", true);
modelMap.put( "product", product );
modelMap.put( "productCategoryList", productCategoryList );
} else{
modelMap.put( "success", false );
modelMap.put( "errMsg", "empty productId" );
}
return modelMap;
}
2.新传入的图片（缩略图或详情图）都会覆盖（删除）掉原来的图片
dao层
/**
* 根据productId获取商品详情图片列表
* @param productId
* @return
*/
List<ProductImg> queryProductImgByProductId(Long productId);
/**
* 根据传入的productImgId删除所有商品详情图片
* @param productId
* @return
*/
int deleteProductImgByProductId(Long productId);
<!--List<ProductImg> queryProductImgByProductId(Long productId);-->
<select id="queryProductImgByProductId" resultType="com.shop.bean.ProductImg">
SELECT
product_img_id,
img_addr
FROM
product_img
WHERE
product_id=#{productId}
</select>
<!--int deleteProductImgByProductId(Long productId);-->
<delete id="deleteProductImgByProductId" parameterType="java.lang.Long">
DELETE FROM product_img WHERE product_id=#{productId}
</delete>
3.点击提交按钮之后，提交到后台，修改数据库中的信息
dao层
/**
* 更新商品信息
* @param product
* @return
*/
int updateProduct(Product product);
<update id="updateProduct" parameterType="com.shop.bean.Product">
UPDATE product
<set>
<if test="productName != null">product_name=#{productName},</if>
<if test="productDesc != null">product_desc=#{productDesc},</if>
<if test="imgAddr != null">img_addr=#{imgAddr},</if>
<if test="normalPrice != null">normal_price=#{normalPrice},</if>
<if test="promotionPrice != null">promotion_price=#{promotionPrice},</if>
<if test="lastEditTime != null">last_edit_time=#{lastEditTime},</if>
<if test="status != null">status=#{status},</if>
<if test="productCategory != null
and productCategory.productCategoryId != null">product_category_id=#{productCategory.productCategoryId}</if>
</set>
WHERE product_id=#{productId}
AND shop_id=#{shop.shopId}
</update>
service
/**
* 修改商品信息
*1.若缩略图参数有值，则处理缩略图
* 若原来存在缩略图，则先删除文件夹下的缩略图，然后再获取新的缩略图相对路径，并赋值给product
* 2.若商品详情列表有值，则再处理商品详情图，删除文件夹下的商品详情图
* 3.将product_img数据库中的商品记录删除
* 4.更新数据库product_img和product的信息
* @param product
* @return
*/
@Override
@Transactional
public ProductExecution modifyProduct(Product product, CommonsMultipartFile thumbnail, List<CommonsMultipartFile> productImgList)
throws ProductOperationException {
if(product != null && product.getShop() != null && product.getShop().getShopId() != null){
try{
//如果商品缩略图改变了的话，就将原来的商品缩略图删除，再放入新的
if(thumbnail != null){
//从数据库获取传入的商品信息
Product tempProduct = productDao.queryProductByproductId( product.getProductId() );
//首先判断是否存在根据商品Id有当前要插入的商品信息
if(tempProduct != null && tempProduct.getImgAddr() != null){
ImageUtil.deleteFileOrPath( tempProduct.getImgAddr() );
}
addThumbnail( product, thumbnail );
}
//如果添加了商品详情图的话，就把原来的商品详情图删掉，再加入新的
if(productImgList != null && productImgList.size() > 0){
deleteProductImgList(product.getProductId());
addProductImgList( product, productImgList );
}
//添加商品信息中必要的部分
product.setLastEditTime( new Date( ) );
int effectNum = productDao.updateProduct( product );
if(effectNum > 0){
product = productDao.queryProductByproductId( product.getProductId() );
return new ProductExecution(ProductStateEnum.SUCCESS, product);
} else{
return new ProductExecution( ProductStateEnum.INNER_ERROR );
}
}catch(ProductOperationException e){
throw new ProductOperationException( "modify product error : " + e.getMessage() );
}
} else{
return new ProductExecution(ProductStateEnum.EMPTY);
}
}
/**
* 将商品缩略图添加到用户相对的文件夹下，并将店铺信息中的商品图片信息更新
* @param product
* @param thumbnail
*/
private void addThumbnail(Product product, CommonsMultipartFile thumbnail){
//获取缩略图的存储途径，直接存储在店铺的文件夹下
String relativeImgPath = PathUtil.getShopImgPath(product.getShop().getShopId());
String realRelativeImgPath = ImageUtil.generateThumbnail(thumbnail, relativeImgPath);
product.setImgAddr( realRelativeImgPath );
}
/**
* 批量添加商品详情图片到用户相对的文件夹下，并将其批量插入到数据库中
* @param product
* @param productImgList
*/
private void addProductImgList(Product product, List<CommonsMultipartFile> productImgList){
//获取图片的存储途径，直接存储在店铺的文件夹下
String relativeImgPath = PathUtil.getShopImgPath( product.getShop().getShopId() );
List<ProductImg> productImgs = new ArrayList<>();
//遍历图片列表进行处理，并且将结果添加到productImgs中
for(CommonsMultipartFile proImg : productImgList){
String imgAddr = ImageUtil.generateNormalImg(proImg, relativeImgPath);
ProductImg productImg = new ProductImg();
productImg.setImgAddr( imgAddr );
productImg.setProductId(product.getProductId());
productImg.setCreateTime( new Date( ) );
productImgs.add( productImg );
}
if(productImgs.size() > 0){
try{
int effectNum = productImgDao.batchInsertProductImg( productImgs );
if(effectNum <= 0){
throw new ProductOperationException("创建商品详情图片失败");
}
} catch(Exception e){
throw new ProductOperationException("创建商品详情图片失败" + e.toString());
}
}
}
private void deleteProductImgList(Long productId){
//从prodcut_img数据库中获取product_id为productId的
List<ProductImg> productImgList = productImgDao.queryProductImgByProductId(productId);
if(productImgList != null && productImgList.size() > 0){
for(ProductImg tempProductImg : productImgList){
ImageUtil.deleteFileOrPath( tempProductImg.getImgAddr() );
}
//删除数据库中原有的照片
productImgDao.deleteProductImgByProductId( productId );
}
}
controller层
@RequestMapping(value="/modifyproduct", method=RequestMethod.POST)
@ResponseBody
public Map<String, Object> modifyProduct(HttpServletRequest request){
Map<String, Object> modelMap = new HashMap<>();
//校验验证码
//验证码校验
if(!CodeUtil.checkVerifyCode(request)){
modelMap.put( "success", false );
modelMap.put( "errMsg", "验证码错误" );
return modelMap;
}
//接收前端传来的参数：商品信息，缩略图，商品详情图片
ObjectMapper objectMapper = new ObjectMapper( );
Product product = null;
String productStr = HttpServletRequestUtil.getString( request, "productStr" );
CommonsMultipartFile thumbnail = null;
List<CommonsMultipartFile> productImgList = new ArrayList<>();
//在本次会话的上下文session中获取上传的文件
CommonsMultipartResolver commonsMultipartResolver =
new CommonsMultipartResolver(request.getSession().getServletContext());
//如果有缩略图，商品详情图的话，就赋值给相应的变量，没有的话，就不管
if(commonsMultipartResolver.isMultipart( request )){
MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) request;
thumbnail = (CommonsMultipartFile) multipartHttpServletRequest.getFile("thumbnail");
for(int i = 0; i < MAXIMAGECOUNT; i++){
CommonsMultipartFile commonsMultipartFile = (CommonsMultipartFile) multipartHttpServletRequest.getFile( "productImg" + i);
if(commonsMultipartFile != null){
productImgList.add( commonsMultipartFile );
} else{
break;
}
}
}
//从ProductStr字符串中，利用ObjectMapper将productStr转化为其Product实体类
try{
product = objectMapper.readValue(productStr, Product.class);
} catch (Exception e) {
modelMap.put( "success", false );
modelMap.put("errMsg", e.toString());
return modelMap;
}
//如果product不是null，则进行商品修改
if(product != null){
try{
Shop shop = new Shop();
shop.setShopId( 1L );
product.setShop(shop);
ProductExecution productExecution = productService.modifyProduct( product, thumbnail, productImgList );
if(productExecution.getState() == ProductStateEnum.SUCCESS.getState()){
modelMap.put("success", true);
} else{
modelMap.put( "success", false );
modelMap.put( "errMsg", productExecution.getStateInfo() );
}
}catch(RuntimeException e){
modelMap.put( "success", false );
modelMap.put( "errMsg", e.toString() );
return modelMap;
}
} else{
modelMap.put( "success", false );
modelMap.put( "errMsg", "请输入商品信息");
}
return modelMap;
}
