dev-016-be-3-layer-prod-data-query

springEcommerceGuli/backend/EcommerceGuli/gulimall-gateway/src/main/resources/application.yml

@@ -21,6 +21,14 @@ spring:
           uri: https://www.mozilla.org/en-US/firefox/new/
           predicates:
             - Query=url,fox,fire
+        # https://youtu.be/QngyGaQXxz4?t=981
+        - id: admin_route
+          uri: lb://renren-fast
+          predicates:
+            - Path=/api/**  # for any FE request, use "api" prefix
+          filters: # overwrite request path : https://cloud.spring.io/spring-cloud-gateway/reference/html/#global-filters
+            - RewritePath=/api/(?<segment>/?.*), /renren-fast/$\{segment}
+
   application:
     name: gulimall-gateway
 

springEcommerceGuli/backend/EcommerceGuli/gulimall-product/src/main/java/com/yen/gulimall/product/controller/CategoryController.java

@@ -1,21 +1,21 @@
 package com.yen.gulimall.product.controller;
 
 import java.util.Arrays;
+import java.util.List;
 import java.util.Map;
-
 //import org.apache.shiro.authz.annotation.RequiresPermissions;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
-
 import com.yen.gulimall.product.entity.CategoryEntity;
 import com.yen.gulimall.product.service.CategoryService;
 import com.yen.gulimall.common.utils.PageUtils;
 import com.yen.gulimall.common.utils.R;
 
+// https://youtu.be/5aWkhC7plsc?t=190
 
 
 /**
@@ -33,13 +33,18 @@ public class CategoryController {
 
     /**
      * 列表
+     *
+     *  query all categories and their sub categories,
+     *  then return as tree structure:
+     *      - https://youtu.be/5aWkhC7plsc?t=190
      */
-    @RequestMapping("/list")
+    @RequestMapping("/list/tree")
     //@RequiresPermissions("product:category:list")
-    public R list(@RequestParam Map<String, Object> params){
-        PageUtils page = categoryService.queryPage(params);
+    public R list(){
 
-        return R.ok().put("page", page);
+        //List<CategoryEntity> list = categoryService.list();
+        List<CategoryEntity> entities = categoryService.listWithTree();
+        return R.ok().put("data", entities);
     }
 
 

springEcommerceGuli/backend/EcommerceGuli/gulimall-product/src/main/java/com/yen/gulimall/product/entity/CategoryEntity.java

@@ -1,60 +1,63 @@
 package com.yen.gulimall.product.entity;
 
+import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableId;
 import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
 
 import java.io.Serializable;
-import java.util.Date;
-import lombok.Data;
+import java.util.List;
 
 /**
- * 
- * 
  * @author yen
  * @email [email protected]
  * @date 2023-02-01 08:23:29
  */
 @Data
 @TableName("pms_category")
 public class CategoryEntity implements Serializable {
-	private static final long serialVersionUID = 1L;
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 分类id
+     */
+    @TableId
+    private Long catId;
+    /**
+     * 分类名称
+     */
+    private String name;
+    /**
+     * 父分类id
+     */
+    private Long parentCid;
+    /**
+     * 层级
+     */
+    private Integer catLevel;
+    /**
+     * 是否显示[0-不显示，1显示]
+     */
+    private Integer showStatus;
+    /**
+     * 排序
+     */
+    private Integer sort;
+    /**
+     * 图标地址
+     */
+    private String icon;
+    /**
+     * 计量单位
+     */
+    private String productUnit;
+    /**
+     * 商品数量
+     */
+    private Integer productCount;
 
-	/**
-	 * 分类id
-	 */
-	@TableId
-	private Long catId;
-	/**
-	 * 分类名称
-	 */
-	private String name;
-	/**
-	 * 父分类id
-	 */
-	private Long parentCid;
-	/**
-	 * 层级
-	 */
-	private Integer catLevel;
-	/**
-	 * 是否显示[0-不显示，1显示]
-	 */
-	private Integer showStatus;
-	/**
-	 * 排序
-	 */
-	private Integer sort;
-	/**
-	 * 图标地址
-	 */
-	private String icon;
-	/**
-	 * 计量单位
-	 */
-	private String productUnit;
-	/**
-	 * 商品数量
-	 */
-	private Integer productCount;
+    @TableField(exist = false)
+    // https://youtu.be/5aWkhC7plsc?t=646
+    private List<CategoryEntity> children;
 
 }

springEcommerceGuli/backend/EcommerceGuli/gulimall-product/src/main/java/com/yen/gulimall/product/service/CategoryService.java

@@ -4,6 +4,7 @@
 import com.yen.gulimall.common.utils.PageUtils;
 import com.yen.gulimall.product.entity.CategoryEntity;
 
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -16,5 +17,7 @@
 public interface CategoryService extends IService<CategoryEntity> {
 
     PageUtils queryPage(Map<String, Object> params);
+
+    List<CategoryEntity> listWithTree();
 }
 

springEcommerceGuli/backend/EcommerceGuli/gulimall-product/src/main/java/com/yen/gulimall/product/service/impl/CategoryServiceImpl.java

@@ -1,21 +1,28 @@
 package com.yen.gulimall.product.service.impl;
 
-import org.springframework.stereotype.Service;
-import java.util.Map;
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import com.yen.gulimall.common.utils.PageUtils;
 import com.yen.gulimall.common.utils.Query;
-
 import com.yen.gulimall.product.dao.CategoryDao;
 import com.yen.gulimall.product.entity.CategoryEntity;
 import com.yen.gulimall.product.service.CategoryService;
+import org.springframework.stereotype.Service;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 
+// https://youtu.be/5aWkhC7plsc?t=283
 
 @Service("categoryService")
 public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
 
+    // since CategoryDao extends from BaseMapper, so we can use BaseMapper below instead for querying data
+    // (public interface CategoryDao extends BaseMapper<CategoryEntity>)
+    //@Autowired
+    //CategoryDao categoryDao;
+
     @Override
     public PageUtils queryPage(Map<String, Object> params) {
         IPage<CategoryEntity> page = this.page(
@@ -26,4 +33,52 @@ public PageUtils queryPage(Map<String, Object> params) {
         return new PageUtils(page);
     }
 
+    /**
+     *  method :
+     *   - query all categories and their sub categories, then return as tree structure
+     */
+    @Override
+    public List<CategoryEntity> listWithTree() {
+
+        // step 1) get all categories
+        List<CategoryEntity> entities =  baseMapper.selectList(null); //NOTE : no query condition (selectList(null)) -> query all data
+        System.out.println(">>> entities = " + entities);
+
+        // step 2) wrap as parent-child tree structure
+        // step 2-1) get all layer 1 categories
+        List<CategoryEntity> levelOneEntities = entities.stream()
+                // ParentCid == 0 : layer 1 categories
+                .filter(categoryEntity -> {
+                    return categoryEntity.getParentCid() == 0;
+                }).map(menu -> {
+                    // call private method below
+                    menu.setChildren(getChildren(menu, entities));
+                    return menu;
+                }).sorted((menu1, menu2) -> {
+                    return menu1.getSort() - menu2.getSort();
+                }).collect(Collectors.toList());
+
+        return levelOneEntities;
+    }
+
+    // local helper method
+    // recursive get all Children from current CategoryEntity : https://youtu.be/5aWkhC7plsc?t=1010
+    private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all) {
+
+        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
+                    return categoryEntity.getParentCid() == root.getCatId();
+                }).map(categoryEntity -> {
+                    // NOTE!!! we call getChildren again below (recursive)
+                    categoryEntity.setChildren(getChildren(categoryEntity, all));
+                    return categoryEntity;
+                })
+                .sorted((menu1, menu2) -> {
+                    // handle if menu is null (avoid null pointer error)
+                    return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
+                })
+                .collect(Collectors.toList());
+
+        return children;
+    }
+
 }

springEcommerceGuli/backend/EcommerceGuli/renren-fast/pom.xml

@@ -56,11 +56,11 @@
 
 	<dependencies>
 
-<!--		<dependency>-->
-<!--			<groupId>com.atguigu.gulimall</groupId>-->
-<!--			<artifactId>gulimall-common</artifactId>-->
-<!--			<version>0.0.1-SNAPSHOT</version>-->
-<!--		</dependency>-->
+		<dependency>
+			<groupId>com.yen</groupId>
+			<artifactId>gulimall-common</artifactId>
+			<version>0.0.1-SNAPSHOT</version>
+		</dependency>
 
 		<dependency>
 			<groupId>com.google.code.gson</groupId>

springEcommerceGuli/backend/EcommerceGuli/renren-fast/src/main/java/io/renren/RenrenApplication.java

@@ -10,8 +10,9 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 
-
+@EnableDiscoveryClient
 @SpringBootApplication
 public class RenrenApplication {
 

springEcommerceGuli/backend/EcommerceGuli/renren-fast/src/main/resources/application.yml

@@ -11,6 +11,14 @@ server:
     context-path: /renren-fast
 
 spring:
+  # https://youtu.be/QngyGaQXxz4?t=857
+  cloud:
+    nacos:
+      discovery:
+        server-addr: 127.0.0.1:8848
+  application:
+    name: renren-fast
+
   # 环境 dev|test|prod
   profiles:
     active: dev # default env is dev

springEcommerceGuli/backend/README.md

@@ -83,8 +83,8 @@ java -jar <built_jar>
 
 | API | Type | Purpose | Example cmd | Comment|
 | ----- | -------- | ---- | ----- | ---- |
-| Admin backend | GET | http://localhost:8080/renren-fast/ | |
-
+| Admin backend | GET | http://localhost:8080/renren-fast/ | | run this backend first, then run Admin frontend
+| login test | GET | http://localhost:8080/renren-fast/captcha.jpg | | 
 
 | API | Type | Purpose | Example cmd | Comment|
 | ----- | -------- | ---- | ----- | ---- |
@@ -99,6 +99,7 @@ java -jar <built_jar>
 | API | Type | Purpose | Example cmd | Comment|
 | ----- | -------- | ---- | ----- | ---- |
 | Product list | GET | http://localhost:10000/product/attrattrgrouprelation/list | |
+| Product tree list | GET | http://localhost:10000/product/category/list/tree | |
 
 
 | API | Type | Purpose | Example cmd | Comment|

springEcommerceGuli/frontend/README.md

@@ -38,5 +38,7 @@ brew install [email protected]
 ## Run
 
 ## Ref
+- FE src code ref:
+	- https://github.com/yennanliu/SpringPlayground/tree/main/courses/%E8%B0%B7%E7%B2%92%E5%95%86%E5%9F%8E_%E5%85%A8%E6%A3%A7%E9%96%8B%E7%99%BC_src_code/docs/%E4%BB%A3%E7%A0%81/%E5%89%8D%E7%AB%AF/modules
 - Install node with different version on macbook M1
 	- https://juejin.cn/post/7002566911456182303