技术汇总：第五章：使用angularjs做首页三级分类

页面：

    <script type="text/javascript" src="plugins/angularjs/angular.min.js"></script>
    <script type="text/javascript" src="js/service/userService.js"></script>
    <script type="text/javascript" src="js/controller/userController.js"></script>
     
    <div class="item bo" ng-repeat="entity in list">
    <!-- 去重 -->
        <h3><a href=""  ng-hide="list[$index].catOneName == list[$index+1].catOneName">{{entity.catOneName}}</a></h3>
        <div class="item-list clearfix">
        <div class="subitem">
        <dl class="fore">
    <!-- 去重 -->
        <dt><a href="" ng-hide="list[$index].catTwoName == list[$index+1].catTwoName">{{entity.catTwoName}}</a></dt>
            <dd><em><a href="">{{entity.catThreeName}}</a></em></dd>
        </dl>
        </div>
        </div>
    </div>

实体类：

    public class TbItemCat implements Serializable{
        private Long id;
     
        private Long parentId;
     
        private String name;
     
        private Long typeId;

sql做自连接查询:

 mapper.xml

      <select id="selectAll" resultType="java.util.HashMap">
        SELECT
        cat1.`id` catOneId,cat1.`name` catOneName,cat1.`parent_id` parentIdOne,cat2.id catTwoId,cat2.`name` catTwoName,cat2.`parent_id` parentIdTwo,cat3.id catThreeId,cat3.`name` catThreeName,cat3.`parent_id` parentIdThree
        FROM tb_item_cat cat1,tb_item_cat cat2,tb_item_cat cat3
        WHERE cat1.`id`=cat2.`parent_id` AND cat2.id=cat3.`parent_id`
      </select>

mapper接口：

List<Map<String,TbItemCat>> selectAll();
impl实现类:

    @Override
    public List<Map<String,TbItemCat>> selectAll() {
        List<Map<String,TbItemCat>> selectAll = itemCatMapper.selectAll();
        return selectAll;
    }
controller控制层:

    @RequestMapping("/findAll")
    public List<Map<String,TbItemCat>> findAll(){
        List<Map<String,TbItemCat>> selectAll = itemCatService.selectAll();
        return selectAll;
    }
contentController.js

app.controller("contentController",function($scope,contentService){
    $scope.list = [];
    $scope.findAll=function(){
        contentService.findAll().success(function(response){
            //将相应的数据放到list里面
            $scope.list = response;
        });
    }
    
});
contentService.js

app.service("contentService",function($http){
    this.findAll = function(){
        return $http.get("content/findAll.do");
    }
});

控制层获取的数据和数据库的数据一样，一条一条的用list集合接收，但是发现页面经过去重之后，数据不对，换了另一种思路

创建一级分类的实体类

    public class TbItemCatOneExample  implements Serializable {
     
        private Long id;
     
        private Long parentId;
     
        private String name;
     
        private Long typeId;
        
        private List<TbItemCat> tbItemCats2;

创建二级分类的实体类

    public class TbItemCatTwoExample implements Serializable{
     
        private Long id;
     
        private Long parentId;
     
        private String name;
     
        private Long typeId;
        
        private List<TbItemCat> tbItemCats3;

创建三级分类实体类

    public class TbItemCat implements Serializable{
        private Long id;
     
        private Long parentId;
     
        private String name;
     
        private Long typeId;

控制层controller

        @RequestMapping("/findAll")
        public List<TbItemCatOneExample> findAll(){
            List<TbItemCatOneExample> selectAll = itemCatService.selectAll();
            System.out.println(selectAll);
            return selectAll;
        }

service接口

        /**
         * 首页三级分类
         * @return
         */
        public List<TbItemCatOneExample> selectAll();

serviceImpl实现类

        @Override
        public List<TbItemCatOneExample> selectAll() {
            //从库中获取的数据
            List<TbItemCatOneExample> selectAll = itemCatMapper.selectAll();
            return selectAll;
        }

mapper接口

List<TbItemCatOneExample> selectAll();

mapper.xml

       <resultMap id="BaseResultMap1" type="com.pinyougou.pojo.TbItemCatOneExample" >
        <id column="catOneId" property="id" jdbcType="BIGINT" />
        <result column="parentIdOne" property="parentId" jdbcType="BIGINT" />
        <result column="catOneName" property="name" jdbcType="VARCHAR" />
        <collection property="tbItemCats2" ofType="com.pinyougou.pojo.TbItemCatTwoExample" javaType="java.util.ArrayList">
            <id column="catTwoId" property="id" jdbcType="BIGINT" />
            <result column="parentIdTwo" property="parentId" jdbcType="BIGINT" />
            <result column="catTwoName" property="name" jdbcType="VARCHAR" />
                <collection property="tbItemCats3" ofType="com.pinyougou.pojo.TbItemCat" javaType="java.util.ArrayList">
                <id column="catThreeId" property="id" jdbcType="BIGINT" />
                <result column="parentIdThree" property="parentId" jdbcType="BIGINT" />
                <result column="catThreeName" property="name" jdbcType="VARCHAR" />
            </collection>
        </collection>
      </resultMap>
     
      
      <select id="selectAll" resultMap="BaseResultMap1">
        SELECT
        cat1.`id` catOneId,cat1.`name` catOneName,cat1.`parent_id` parentIdOne,cat2.id catTwoId,cat2.`name` catTwoName,cat2.`parent_id` parentIdTwo,
        cat3.id catThreeId,cat3.`name` catThreeName,cat3.`parent_id` parentIdThree
        FROM tb_item_cat cat1,tb_item_cat cat2,tb_item_cat cat3
        WHERE cat1.`id`=cat2.`parent_id` AND cat2.id=cat3.`parent_id`
      </select>

在控制台获取到想要的数据了

但是页面展示发现angularjs不能再class中传递，需要修改样式，去除class，有点小尴尬

页面

    <div  ng-repeat="entity in list">
        <h3><a href=""  >{{entity.name}}</a></h3>
        <div  ng-repeat="cat2 in entity.tbItemCats2" >
        <div   >
        <dl  >
        <dt><a href="" >{{cat2.name}}</a></dt>
        <dd  ng-repeat="cat3 in cat2.tbItemCats3"><em><a href="">{{cat3.name}}</a></em></dd>
        </dl>
        </div>
        </div>
    </div>