Java 递归查询部门树形结构数据的实践
说明:在开发中,我们经常使用树形结构来展示菜单选项,如图:
那么我们在后端怎么去实现这样的一个功能呢?
1、数据库表:department
2、编写sql映射语句
<select id="selectDepartmentTrees" resultType="com.welb.entity.Department"> select * from department <where> <if test="updepartmentcode!=null"> and UpDepartmentCode=#{updepartmentcode} </if> </where> </select>
3、创建实体类
public class Department { private String departmentcode;//部门code private String departmentname;//部门名称 private String updepartmentcode="0";//上级部门 private String departmentdesc;//部门描述 private List<Department> childDept =new ArrayList();//部门信息树 public String getDepartmentcode() { return departmentcode; } public void setDepartmentcode(String departmentcode) { this.departmentcode = departmentcode == null ? null : departmentcode.trim(); } public String getDepartmentname() { return departmentname; } public void setDepartmentname(String departmentname) { this.departmentname = departmentname == null ? null : departmentname.trim(); } public String getUpdepartmentcode() { return updepartmentcode; } public void setUpdepartmentcode(String updepartmentcode) { this.updepartmentcode = updepartmentcode == null ? null : updepartmentcode.trim(); } public String getDepartmentdesc() { return departmentdesc; } public void setDepartmentdesc(String departmentdesc) { this.departmentdesc = departmentdesc == null ? null : departmentdesc.trim(); } public List<Department> getChildDept() { return childDept; } public void setChildDept(List<Department> childDept) { this.childDept = childDept; } }
4、定义mapper
@Mapper public interface DepartmentMapper { List<Department>selectDepartmentTrees(Department department); }
5、定义service业务层实现
@Service @Transactional public class DepartmentImpl implements IDepartmentService { @Resource DepartmentMapper departmentMapper; @Override public List<Department> selectDepartmentTrees(Department department) { return departmentMapper.selectDepartmentTrees(department); } }
6、控制层实现
@RestController @RequestMapping("department") public class DepartmentController { @Resource IDepartmentService departmentService; @Resource IStationService stationService; /** * 查询所有部门 树形展示所有部门 包含模糊查詢 * * @return */ @RequestMapping("/treelist") public Object selectAll(Department department) { ModelMap map = new ModelMap(); try { List<Department> departmentDtos = getDepartmentList(department); map.put("msg", "查询部门成功"); map.put("data", departmentDtos); map.put("code", 0); } catch (Exception e) { e.printStackTrace(); map.put("msg", "查询部门失败"); map.put("code", 1); } return map; } /** * 递归查询部门 * @param department * @return */ private List<Department> getDepartmentList(Department department) { List<Department> departments =departmentService.selectDepartmentTrees(department); if (departments.size()>0){ Department department1=new Department(); for (int i = 0; i <departments.size() ; i++) { department1.setUpdepartmentcode(departments.get(i).getDepartmentcode()); List<Department>dtos=getDepartmentList(department1); departments.get(i).setChildDept(dtos); } } return departments; } }
7、进行测试,这里我用postmain工具测试,结果如下图
到这里,递归查询部门树形结构数据就完成了
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