功能

构造数据

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"/products/696.html|宠物玩具", "/products/697.html|出行装备", "/products/698.html|洗护美容"]}]}, {"u": "/products/699.html","n": "<a href='/products/699.html'>厨具</a>","i": [{"u": "/products/700.html","n": "烹饪锅具","i": ["/products/701.html|炒锅", "/products/702.html|煎锅", "/products/703.html|压力锅", "/products/704.html|蒸锅", "/products/705.html|汤锅", "/products/706.html|奶锅", "/products/707.html|锅具套装", "/products/708.html|煲类", "/products/709.html|水壶", "/products/710.html|火锅"]}, {"u": "/products/711.html","n": "刀剪菜板","i": ["/products/712.html|菜刀", "/products/713.html|剪刀", "/products/714.html|刀具套装", "/products/715.html|砧板", "/products/716.html|瓜果刀/刨", "/products/717.html|多功能刀"]}, {"u": "/products/718.html","n": "厨房配件","i": ["/products/719.html|保鲜盒", "/products/720.html|烘焙/烧烤", "/products/721.html|饭盒/提锅", "/products/722.html|储物/置物架", "/products/723.html|厨房DIY/小工具"]}, {"u": "/products/724.html","n": "水具酒具","i": ["/products/725.html|塑料杯", "/products/726.html|运动水壶", "/products/727.html|玻璃杯", 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});

修改JS

测试效果：

数据结构

后台系统开发接口返回数据

现在我们需要用后台系统来返回我们之前的json数据。

定义ItemCatResult

我们根据之前json的数据结构，我们来定义IteamCatResult:

定义ItemCatData

我们都把它们放在common里面：

并在common的pom.xml导入json的依赖：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>com.taotao.parent</groupId><artifactId>taotao-parent</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.taotao-common</groupId><artifactId>taotao-common</artifactId><dependencies><!-- Jackson Json处理工具包 --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId></dependency></dependencies>
</project>

Controller

Service

  /*** 全部查询，并且生成树状结构* * @return*/public ItemCatResult queryAllToTree() {ItemCatResult result = new ItemCatResult();// 全部查出，并且在内存中生成树形结构List<ItemCat> cats = super.queryAll();// 转为map存储，key为父节点ID，value为数据集合Map<Long, List<ItemCat>> itemCatMap = new HashMap<Long, List<ItemCat>>();for (ItemCat itemCat : cats) {if (!itemCatMap.containsKey(itemCat.getParentId())) {itemCatMap.put(itemCat.getParentId(), new ArrayList<ItemCat>());}itemCatMap.get(itemCat.getParentId()).add(itemCat);}// 封装一级对象List<ItemCat> itemCatList1 = itemCatMap.get(0L);for (ItemCat itemCat : itemCatList1) {ItemCatData itemCatData = new ItemCatData();itemCatData.setUrl("/products/" + itemCat.getId() + ".html");itemCatData.setName("<a href='" + itemCatData.getUrl() + "'>" + itemCat.getName() + "</a>");result.getItemCats().add(itemCatData);if (!itemCat.getIsParent()) {continue;}// 封装二级对象List<ItemCat> itemCatList2 = itemCatMap.get(itemCat.getId());List<ItemCatData> itemCatData2 = new ArrayList<ItemCatData>();itemCatData.setItems(itemCatData2);for (ItemCat itemCat2 : itemCatList2) {ItemCatData id2 = new ItemCatData();id2.setName(itemCat2.getName());id2.setUrl("/products/" + itemCat2.getId() + ".html");itemCatData2.add(id2);if (itemCat2.getIsParent()) {// 封装三级对象List<ItemCat> itemCatList3 = itemCatMap.get(itemCat2.getId());List<String> itemCatData3 = new ArrayList<String>();id2.setItems(itemCatData3);for (ItemCat itemCat3 : itemCatList3) {itemCatData3.add("/products/" + itemCat3.getId() + ".html|" + itemCat3.getName());}}}if (result.getItemCats().size() >= 14) {break;}}return result;}

测试