巴巴运动网学习笔记(86-90)

1.显示大类别下的所有产品
a.查找某个类别下面的所有子类及子类的子类　　

View Code

 1 @SuppressWarnings("unchecked")

 2     @Transactional(readOnly=true,propagation=Propagation.NOT_SUPPORTED)//该方法为只读，不需要事务支持

 3     public List<ProductType> getChildsByParentId(Integer parentId){

 4         Query query = entityManager.createQuery("select t from ProductType t where t.parent.id = ?1");

 5         query.setParameter(1, (int)parentId);

 6         return query.getResultList();

 7     }

 8     

 9     public List<ProductType> getAllChildsByParentId(Integer parentId){

10         List<ProductType> productTypeIds = new ArrayList<ProductType>();

11         Queue<ProductType> temp = new LinkedList<ProductType>();

12         ProductType p = find(ProductType.class, (int)parentId);

13         while(p!=null){

14             productTypeIds.add(p);

15             List<ProductType> childIds = getChildsByParentId(p.getId());

16             for(ProductType i : childIds){

17                 temp.offer(i);

18             }

19             p = temp.poll();

20         }

21         return productTypeIds;

22     }

b.获取某个类别下面的所有产品

View Code

 1     /**

 2      * 根据产品类型id查找该产品类型及子类型下的所有产品的品牌

 3      */

 4     @SuppressWarnings("unchecked")

 5     @Transactional(readOnly=true,propagation=Propagation.NOT_SUPPORTED)

 6     public List<Brand> getBrandsByProTyId(int proTypeID){

 7         List<ProductType> productTypes = productTypeService.getAllChildsByParentId(proTypeID);

 8         //组拼根据ids查询产品的语句

 9         StringBuffer jpql2 = new StringBuffer("");

10         for(int i=0;i<productTypes.size();i++){

11             jpql2.append("?").append(i+1).append(",");

12         }

13         jpql2.deleteCharAt(jpql2.length()-1);

14         StringBuffer jpql = new StringBuffer("select distinct b from Brand b where b.id in (select p.brand.id from Product p where p.productType.id in ("+jpql2+"))");

15         Query query = entityManager.createQuery(jpql.toString());

16         //为其设置参数

17         for(int i=0;i<productTypes.size();i++){

18             query.setParameter(i+1, productTypes.get(i).getId());

19         }

20         return query.getResultList();

21     }

2.在前台页面中显示导航菜单和子类别

View Code

 1 //设置导航数据

 2         Stack<ProductType> navigation = new Stack<ProductType>();

 3         ProductType parent = productService.find(ProductType.class,productForm.getProductTypeId());

 4         while(parent!=null){

 5             navigation.push(parent);

 6             parent = parent.getParent();

 7         }

 8         List<ProductType> navigationList = new ArrayList<ProductType>();

 9         while(!navigation.empty()){

10             navigationList.add(navigation.pop());

11         }

View Code

1 <div id="position">您现在的位置:&gt;&gt; <a href="/" name="linkHome">巴巴运动网</a> 

2         <c:forEach items="${navigation}" var="nv" varStatus="state">

3             <c:choose>

4                 <c:when test="${state.count==fn:length(navigation)}">&gt;&gt;<em>${nv.name }</em></c:when>

5                 <c:otherwise>&gt;&gt;<a href="<html:rewrite action='/product/list'/>?productTypeId=${nv.id }">${nv.name }</a></c:otherwise>

6             </c:choose>        

7         </c:forEach>

8     (${pagingBean.totalRecords })

9     </div>

View Code

1 <div class="browse_t">${productType.name}</div>

2             

3                 <h2><span class="gray">浏览下级分类</span></h2>

4                 <ul>

5                     <c:forEach items="${productType.child}" var="proType" >

6                         <li class='bj_blue'><a href="<html:rewrite action='/product/list'/>?productTypeId=${proType.id }">${proType.name }</a></li>    

7                     </c:forEach>

8             </ul>

9          </div>

3.在前台页面中显示最畅销产品的技术分析
 a.某一个产品类别下面的
 b.后台推荐的
 c.按照销量进行排序
 d.使用ajax技术，进行异步显示
4.使用ajax技术展示最畅销产品

a.获取最畅销产品的业务方法

View Code

 1 /**

 2      * 查找某个类别下面的最畅销的商品

 3      * @param productTypeId 类别id

 4      * @param maxCount 查找个数

 5      * @return

 6      */

 7     @SuppressWarnings("unchecked")

 8     public List<Product> getTopsellProduct(int productTypeId,int maxCount){

 9         List<ProductType> productTypes = productTypeService.getAllChildsByParentId(productTypeId);

10         //组拼根据ids查询产品的语句

11         StringBuffer jpql2 = new StringBuffer("");

12         for(int i=0;i<productTypes.size();i++){

13             jpql2.append("?").append(i+2).append(",");

14         }

15         jpql2.deleteCharAt(jpql2.length()-1);

16         StringBuffer jpql = new StringBuffer("select p from Product p where p.commend = ?1 and p.productType.id in ("+jpql2+") order by sellCount desc");

17         Query query = entityManager.createQuery(jpql.toString());

18         //为其设置参数

19         query.setParameter(1, true);

20         for(int i=0;i<productTypes.size();i++){

21             query.setParameter(i+2, productTypes.get(i).getId());

22         }

23         query.setFirstResult(0).setMaxResults(maxCount);

24         return query.getResultList();

25     }

b.处理请求的manageraction

View Code

 1 @Controller("/product/manager")

 2 public class FrontProductManagerAction extends DispatchAction {

 3     @Resource(name="productServiceImpl")

 4     ProductService productService;

 5     public ActionForward getTopsell(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)

 6     throws Exception {

 7         FrontProductForm productForm = (FrontProductForm)form;

 8         request.setAttribute("topsell", productService.getTopsellProduct(productForm.getProductTypeId(), 10));

 9         return mapping.findForward("list");

10     }

11 }

c.页面的代码

View Code

 1 <SCRIPT LANGUAGE="JavaScript">

 2 <!--

 3     function getTopSell(typeid){

 4         var salespromotion = document.getElementById('salespromotion');        

 5         if(salespromotion && typeid!=""){

 6             salespromotion.innerHTML= "数据正在加载...";

 7             send_request(function(value){salespromotion.innerHTML=value}, "<html:rewrite action='/product/manager'/>?method=getTopsell&productTypeId="+ typeid, true);

 8         }

 9     }

10     function pageInit(){        

11         getTopSell("${productType.id}");

12     }

13 //-->

14 </SCRIPT>

View Code

1 <body class="ProducTypeHome2" onload="JavaScript:pageInit()">

View Code

1 <DIV class="lanmu_font">最畅销户外用品</DIV>

2         <DIV style="PADDING-LEFT: 10px; COLOR: #333333" id="salespromotion">

5.修正按品牌和性别过滤的一些bug