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我们已经创建好了 rest 系统，那么接下来这一小节我们来实现商城首页的分类数据展示。

在 portal 系统中，我们的首页目前是静态的数据，接下来我们就从 rest 系统中取 json 数据，接着将数据展示到首页分类中。

主要思路

  1. 在 portal 系统中获取 rest 服务中的 json 数据；
  2. 使用 freemarker 展示数据

商城分类json数据格式

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{
    "categories":[
        {
            "cat_id":"1",
            "name":"父级分类名称",
            "sub_cetegories":[
                {
                    "cat_id":"2",
                    "name":"java se"
                },
                {
                    "cat_id":"3",
                    "name":"java ee"
                }
            ]
        },
        {
            "cat_id":"2",
            "name":"分类名称",
            "sub_cetegories":[
                {
                    "cat_id":"2",
                    "name":"java se"
                },
                {
                    "cat_id":"3",
                    "name":"java ee"
                }
            ]
        }
    ]
}

通过json数据转化为实体类

可以使用 idea 的 GsonFormart 插件生成相应的实体类

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public class Res_Categories {


    private List<CategoriesBean> categories;

    public List<CategoriesBean> getCategories() {
        return categories;
    }

    public void setCategories(List<CategoriesBean> categories) {
        this.categories = categories;
    }

    public static class CategoriesBean {
        /**
         * cat_id : 1
         * name : 父级分类名称
         * sub_cetegories : [{"cat_id":"2","name":"java se"},{"cat_id":"3","name":"java ee"}]
         */

        private String cat_id;
        private String name;
        private List<SubCetegoriesBean> sub_cetegories;

        public String getCat_id() {
            return cat_id;
        }

        public void setCat_id(String cat_id) {
            this.cat_id = cat_id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public List<SubCetegoriesBean> getSub_cetegories() {
            return sub_cetegories;
        }

        public void setSub_cetegories(List<SubCetegoriesBean> sub_cetegories) {
            this.sub_cetegories = sub_cetegories;
        }

        public static class SubCetegoriesBean {
            /**
             * cat_id : 2
             * name : java se
             */

            private String cat_id;
            private String name;

            public String getCat_id() {
                return cat_id;
            }

            public void setCat_id(String cat_id) {
                this.cat_id = cat_id;
            }

            public String getName() {
                return name;
            }

            public void setName(String name) {
                this.name = name;
            }
        }
    }
}

具体实现

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@Service
public class ProductCategoryServiceImpl implements ProductCategoryService {

    @Autowired
    ProductCategoryMapper productCategoryMapper;

    @Override
    public Res_Categories getCategories() {

        Res_Categories res_categories = new Res_Categories();

        ProductCategoryExample productCategoryExample = new ProductCategoryExample();
        ProductCategoryExample.Criteria criteria = productCategoryExample.createCriteria();
        criteria.andParentIdEqualTo((short) 0);
        List<ProductCategory> productCategories = productCategoryMapper.selectByExample(productCategoryExample);

        List<Res_Categories.CategoriesBean> categories = new ArrayList<>();

        for (int i = 0; i < productCategories.size(); i++) {
            Res_Categories.CategoriesBean categoriesBean = new Res_Categories.CategoriesBean();
            categoriesBean.setCat_id(productCategories.get(i).getId()+"");
            categoriesBean.setName(productCategories.get(i).getName());

            //获取子分类
            List<Res_Categories.CategoriesBean.SubCetegoriesBean> subCategories = getSubCategories(productCategories
                    .get(i)
                    .getId());

            categoriesBean.setSub_cetegories(subCategories);
            categories.add(categoriesBean);
        }

        res_categories.setCategories(categories);

        return res_categories;
    }

    private List<Res_Categories.CategoriesBean.SubCetegoriesBean> getSubCategories(Short id) {

        List<Res_Categories.CategoriesBean.SubCetegoriesBean> list = new ArrayList<>();

        ProductCategoryExample productCategoryExample = new ProductCategoryExample();
        ProductCategoryExample.Criteria criteria = productCategoryExample.createCriteria();
        criteria.andParentIdEqualTo(id);
        List<ProductCategory> productCategories = productCategoryMapper.selectByExample(productCategoryExample);

        for (int i = 0; i <productCategories.size() ; i++) {
            ProductCategory productCategory = productCategories.get(i);
            Res_Categories.CategoriesBean.SubCetegoriesBean subCetegoriesBean = new Res_Categories.CategoriesBean
                    .SubCetegoriesBean();
            subCetegoriesBean.setCat_id(productCategory.getId()+"");
            subCetegoriesBean.setName(productCategory.getName());
            list.add(subCetegoriesBean);
        }

        return list;
    }
}