目录

🍿1.查询三级分类

🧂2.前端页面搭建 

🍟3.添加网关

🍳4.解决跨域 

🧇5.显示分类 

🥞6.显示复选框 

---

1.查询三级分类

1.controller

直接调用service层的接口

 @RequestMapping("/list/tree")public R list(){List<CategoryEntity> entityList=categoryService.listWithTree();return R.ok().put("data",entityList);}

2.service

• 1.查询所有分类
• 2.找到所有的一级分类
• 3.在一级分类下递归子菜单

 //查出所有分类@Overridepublic List<CategoryEntity> listWithTree() {//1.查出所有分类List<CategoryEntity> entities = baseMapper.selectList(null);//2.组装成父子结构//2.1---找到所有的一级分类List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) -> {return categoryEntity.getParentCid() == 0;}).map((menu) -> {menu.setChildren(getChildren(menu, entities));return menu;}).sorted((menu1, menu2) -> {return menu1.getSort() - menu2.getSort();}).collect(Collectors.toList());return level1Menus;}//递归查找所有菜单的子菜单private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all) {List<CategoryEntity> children = all.stream().filter(categoryEntity -> {return categoryEntity.getParentCid() == root.getCatId();}).map((categoryEntity -> {//递归找到子菜单categoryEntity.setChildren(getChildren(categoryEntity, all));return categoryEntity;})).sorted((menu1,menu2)->{//2.排序return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());}).collect(Collectors.toList());return children;}

2.前端页面搭建 

• 1.启动renren-fast的前后端，并新建目录

• 2.在renren-fast-vue.src.modules下新建目录product，并在目录下创建category.vue 

根据在目录下新增菜单的URI进行创建

 编写建category.vue 

<template><el-tree:data="data":props="defaultProps"@node-click="handleNodeClick"></el-tree>
</template>
<script>
export default {data () {return {data: [],defaultProps: {children: 'children',label: 'label'}}},methods: {handleNodeClick (data) {console.log(data)},getMenus () {this.$http({url: this.$http.adornUrl('/product/category/list/tree'),method: 'get'}).then((data) => {console.log('获取成功菜单数据', data)})}},created () {this.getMenus()}
}
</script>

• 3.更改访问地址

访问地址路由到网关

3.添加网关

• 1.将renren-fast项目添加到注册中心

• 注意：
• 1.springboot的版本号以及cloud的版本号
• 2.服务名称
• 3.nacos注册地址

• 2.添加网关配置 

• 3.实测

发现访问地址已经路由到网关

4.解决跨域 

• 1.添加跨域配置

在网关层添加跨域配置

小张发现直接运行不添加网关也能进入~不知阁下可否~~~

@Configuration
public class GulimallCorsConfiguration {@Beanpublic CorsWebFilter corsWebFilter() {UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();CorsConfiguration corsConfiguration = new CorsConfiguration();//1.配置跨域corsConfiguration.addAllowedHeader("*");corsConfiguration.addAllowedMethod("*");corsConfiguration.addAllowedOrigin("*");corsConfiguration.setAllowCredentials(true);//是否允许cookieurlBasedCorsConfigurationSource.registerCorsConfiguration("/**",corsConfiguration);return new CorsWebFilter(urlBasedCorsConfigurationSource);}
}

• 2.去除renren-fast的跨域配置 

前面配置了自己的网关，将renren-fast自带的网关删除调，否则报错

5.显示分类 

• 1.在将product添加到网关

注意路由的格式

spring:cloud:gateway:routes:#product三级分类- id: product_routeuri: lb://gulimall-productpredicates:- Path=/api/product/**filters:- RewritePath=/api/(?<segment>.*),/$\{segment}#全部- id: admin_routeuri: lb://renren-fastpredicates:- Path=/api/**filters:- RewritePath=/api/(?<segment>.*),/renren-fast/$\{segment}

注意：先后让精确的路由放到最上面

•  2.配置前端vue

<template><el-tree:data="menus":props="defaultProps"@node-click="handleNodeClick"></el-tree>
</template>
<script>
export default {data () {return {menus: [],defaultProps: {children: 'children',label: 'name'}}},methods: {handleNodeClick (data) {console.log(data)},getMenus () {this.$http({url: this.$http.adornUrl('/product/category/list/tree'),method: 'get'}).then(({data}) => {console.log('获取成功菜单数据', data.data)this.menus = data.data})}},created () {this.getMenus()}
}
</script>

6.显示复选框 

显示复选框以及，删除和显示按钮

让后端看前端，我看到的他们的神奇

<template><el-tree :data="menus" :props="defaultProps"  :expand-on-click-node="false" show-checkbox node-key="catId"><span class="custom-tree-node" slot-scope="{ node, data }"><span>{{ node.label }}</span><span><el-button v-if="node.level <=2" type="text" size="mini" @click="() => append(data)">Append</el-button><el-button v-if="node.childNodes.length==0" type="text" size="mini" @click="() => remove(node, data)">Delete</el-button></span></span></el-tree>
</template>
<script>
export default {data () {return {menus: [],defaultProps: {children: 'children',label: 'name'}}},methods: {handleNodeClick (data) {console.log(data)},getMenus () {this.$http({url: this.$http.adornUrl('/product/category/list/tree'),method: 'get'}).then(({ data }) => {console.log('获取成功菜单数据', data.data)this.menus = data.data})},append (data) {console.log('append', data)},remove (node, data) {console.log('remove', node, data)}},created () {this.getMenus()}
}
</script>