添加行业相关

manager/src/main/java/org/jiayunet/controller/IndustryController.java

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+package org.jiayunet.controller;
+
+import org.jiayunet.pojo.vo.IndustryTreeVo;
+import org.jiayunet.pojo.vo.IndustryVo;
+import org.jiayunet.service.IndustryService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+/**
+ * 行业接口
+ *
+ * @author zk
+ */
+@RestController
+@RequestMapping("/industries")
+public class IndustryController {
+    @Autowired
+    private IndustryService industryService;
+
+    /**
+     * 获取全部行业树（一级-二级嵌套）
+     */
+    @GetMapping("/tree")
+    public List<IndustryTreeVo> getIndustryTree() {
+        return industryService.getIndustryTree();
+    }
+
+    /**
+     * 按父级查询行业列表
+     * @param parentId 父级ID，不传=查一级
+     */
+    @GetMapping
+    public List<IndustryVo> getIndustriesByParent(@RequestParam(required = false) Long parentId) {
+        return industryService.getIndustriesByParent(parentId);
+    }
+
+    /**
+     * 模糊搜索行业
+     * @param keyword 行业名关键字
+     */
+    @GetMapping("/search")
+    public List<IndustryVo> searchIndustries(@RequestParam String keyword) {
+        return industryService.searchIndustries(keyword);
+    }
+}

manager/src/main/java/org/jiayunet/pojo/vo/IndustryTreeVo.java

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+package org.jiayunet.pojo.vo;
+
+import lombok.Data;
+
+import java.util.List;
+
+/**
+ * 行业树形VO
+ *
+ * @author zk
+ */
+@Data
+public class IndustryTreeVo {
+    /** 行业ID */
+    private Long id;
+    /** 行业名称 */
+    private String name;
+    /** 层级 */
+    private Integer level;
+    /** 子级行业列表 */
+    private List<IndustryTreeVo> children;
+}

manager/src/main/java/org/jiayunet/pojo/vo/IndustryVo.java

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+package org.jiayunet.pojo.vo;
+
+import lombok.Data;
+
+/**
+ * 行业VO（平铺结构）
+ *
+ * @author zk
+ */
+@Data
+public class IndustryVo {
+    /** 行业ID */
+    private Long id;
+    /** 行业名称 */
+    private String name;
+    /** 层级 */
+    private Integer level;
+    /** 父级ID */
+    private Long parentId;
+}

manager/src/main/java/org/jiayunet/service/IndustryService.java

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+package org.jiayunet.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import lombok.extern.slf4j.Slf4j;
+import org.jiayunet.mapper.IndustryMapper;
+import org.jiayunet.pojo.po.Industry;
+import org.jiayunet.pojo.vo.IndustryTreeVo;
+import org.jiayunet.pojo.vo.IndustryVo;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * 行业服务
+ * <p>主要功能：行业数据查询（树形、层级、搜索）</p>
+ * <p>依赖：无</p>
+ * <p>使用表：bg_industry</p>
+ *
+ * @author zk
+ */
+@Slf4j
+@Service
+public class IndustryService {
+    @Autowired
+    private IndustryMapper industryMapper;
+
+    /**
+     * 获取全部行业树（一级-二级嵌套）
+     * <p>1. 查询全部行业 2. 按level分组 3. 构建二层树</p>
+     */
+    public List<IndustryTreeVo> getIndustryTree() {
+        List<Industry> allIndustries = industryMapper.selectList(null);
+        List<Industry> level1 = allIndustries.stream().filter(i -> i.getLevel() == 1).collect(Collectors.toList());
+        Map<Long, List<Industry>> level2ByParent = allIndustries.stream().filter(i -> i.getLevel() == 2).collect(Collectors.groupingBy(Industry::getParentId));
+        return level1.stream().map(ind1 -> {
+            IndustryTreeVo vo1 = new IndustryTreeVo();
+            vo1.setId(ind1.getId());
+            vo1.setName(ind1.getName());
+            vo1.setLevel(ind1.getLevel());
+            List<Industry> level2List = level2ByParent.getOrDefault(ind1.getId(), new ArrayList<>());
+            vo1.setChildren(level2List.stream().map(ind2 -> {
+                IndustryTreeVo vo2 = new IndustryTreeVo();
+                vo2.setId(ind2.getId());
+                vo2.setName(ind2.getName());
+                vo2.setLevel(ind2.getLevel());
+                vo2.setChildren(null);
+                return vo2;
+            }).collect(Collectors.toList()));
+            return vo1;
+        }).collect(Collectors.toList());
+    }
+
+    /**
+     * 按父级查询行业列表
+     * <p>parentId为null查一级，否则查下一级</p>
+     */
+    public List<IndustryVo> getIndustriesByParent(Long parentId) {
+        List<Industry> industries;
+        if (parentId == null) {
+            industries = industryMapper.selectList(new LambdaQueryWrapper<Industry>().eq(Industry::getLevel, 1));
+        } else {
+            industries = industryMapper.selectList(new LambdaQueryWrapper<Industry>().eq(Industry::getParentId, parentId));
+        }
+        return industries.stream().map(i -> {
+            IndustryVo vo = new IndustryVo();
+            vo.setId(i.getId());
+            vo.setName(i.getName());
+            vo.setLevel(i.getLevel());
+            vo.setParentId(i.getParentId());
+            return vo;
+        }).collect(Collectors.toList());
+    }
+
+    /**
+     * 模糊搜索行业
+     * <p>按行业名关键字模糊查询</p>
+     */
+    public List<IndustryVo> searchIndustries(String keyword) {
+        List<Industry> industries = industryMapper.selectList(new LambdaQueryWrapper<Industry>().like(Industry::getName, keyword));
+        return industries.stream().map(i -> {
+            IndustryVo vo = new IndustryVo();
+            vo.setId(i.getId());
+            vo.setName(i.getName());
+            vo.setLevel(i.getLevel());
+            vo.setParentId(i.getParentId());
+            return vo;
+        }).collect(Collectors.toList());
+    }
+}