树形结构展示数据

可以使用JSON格式的数据，一层一层包裹

{

     BigName: '''',

     code :'',

     name:[

{

shortCode:''''

shortName: '''

}

   ]

	@ApiModelProperty(value = "科室编号")
	private String depcode;

	@ApiModelProperty(value = "科室名称")
	private String depname;

	@ApiModelProperty(value = "下级节点")
	private List<DepartmentVo> children;

}

ArrayList<DepartmentVo> result = new ArrayList<>();
        //查询所有的科室信息
        Department department = new Department();
        department.setHoscode(hoscode);
        Example<Department> example = Example.of(department);
        List<Department> departmentList = departmentRepository.findAll(example);
        //首先给根据把大科室 按照大科室编号进行分组（bigcode）,在获取每个大科式里面的小科室
        Map<String, List<Department>> departmentMap = departmentList.stream()
                .collect(Collectors.groupingBy(Department::getBigcode));
        //遍历map 集合
        for(Map.Entry<String,List<Department>> entry : departmentMap.entrySet()){
            //大科室 的编号
            String bigCOde = entry.getKey();
            //大科室 的编号  对应的全部数据
            List<Department> departmentsList = entry.getValue();
            //封装大科室
            DepartmentVo departmentVo = new DepartmentVo();
            departmentVo.setDepcode(bigCOde);
            departmentVo.setDepname(departmentsList.get(0).getDepname());
            //封装小科室  大科室里面有很多的小科室
            ArrayList<DepartmentVo> children = new ArrayList<>();
            for (Department departments : departmentsList){
                DepartmentVo departmentVo1 = new DepartmentVo();
                departmentVo1.setDepcode(departments.getDepcode());
                departmentVo1.setDepname(departments.getDepname());
                //封装到小科室里
                children.add(departmentVo1);
            }
            //把小科室的信息放到大科室 里
            departmentVo.setChildren(children);
            //最终放到result  里面
            result.add(departmentVo);
        }
        return result;