java递归查询部门

@Data
public class SysDeptModel {
    private Long id;
    private String name;
    private Long pid;
    private List<SysDeptModel> childrens;
}


//----------------------------------------------------------

List<SysDept> sysDepts = sysDeptService.getDeptList(null);
List<SysDeptModel> list = new ArrayList<>();
SysDeptModel jsonObject = new SysDeptModel();
//添加顶级部门
for (SysDept sysDept : sysDepts) {
    if (sysDept.getParentId().equals(0L)) {
        jsonObject.setId(sysDept.getDeptId());
        jsonObject.setName(sysDept.getDeptName());
        jsonObject.setPid(null);
        list.add(jsonObject);
        break;
    }
}
List<SysDeptModel> jsonObjectList;

for (SysDeptModel object : list) {
    jsonObjectList = getChildren(object.getId(),sysDepts);
    object.setChildrens(jsonObjectList);
}
JSONObject json = new JSONObject();
json.put("data",list);

//----------------------------------------------------------

public List<SysDeptModel> getChildren(Long id,List<SysDept> deptList){
    List<SysDeptModel> childrens = new ArrayList<>();
    SysDeptModel obj;
    for (SysDept sysDept : deptList) {
        if (sysDept.getParentId().equals(id)) {
            obj = new SysDeptModel();
            obj.setId(sysDept.getDeptId());
            obj.setName(sysDept.getDeptName());
            obj.setPid(id);
            childrens.add(obj);
        }
    }
    List<SysDeptModel> jsonList = new ArrayList<>();
    jsonList.add(new SysDeptModel());

    for (SysDeptModel children : childrens) {
        if (children.getChildrens() == null) {
            children.setChildrens(jsonList);
        }
        children.setChildrens(getChildren(children.getId(), deptList));
    }
    if (childrens.size() == 0){
        return null;
    }
    return childrens;
}

技术有限，只能通过这个方法实现了
返回的数据结构

{
    "data": [{
        "id": 1,
        "name": "企业主体信用得分",
        "pid": null,
        "childrens": [{
                "id": 2,
                "name": "企业素质",
                "pid": 1,
                "childrens": [{
                        "id": 5,
                        "name": "基本信息",
                        "pid": 2,
                        "childrens": [{
                                "id": 10,
                                "name": "企业主体信息识别",
                                "pid": 5,
                                "childrens": []
                            },
                            {
                                "id": 11,
                                "name": "企业持续注册时间",
                                "pid": 5,
                                "childrens": []
                            },
                            {
                                "id": 12,
                                "name": "注册资本",
                                "pid": 5,
                                "childrens": []
                            }
                        ]
                    },
                    {
                        "id": 6,
                        "name": "管理认证",
                        "pid": 2,
                        "childrens": [{
                            "id": 13,
                            "name": "国际性管理认证",
                            "pid": 6,
                            "childrens": []
                        }]
                    }
                ]
            },
            {
                "id": 3,
                "name": "履约记录",
                "pid": 1,
                "childrens": [{
                        "id": 7,
                        "name": "税务执行情况",
                        "pid": 3,
                        "childrens": [{
                            "id": 14,
                            "name": "是否按时缴纳税款",
                            "pid": 7,
                            "childrens": []
                        }]
                    },
                    {
                        "id": 8,
                        "name": "网贷情况",
                        "pid": 3,
                        "childrens": [{
                            "id": 15,
                            "name": "网贷逾期",
                            "pid": 8,
                            "childrens": []
                        }]
                    }
                ]
            },
            {
                "id": 4,
                "name": "公共监督",
                "pid": 1,
                "childrens": [{
                    "id": 9,
                    "name": "行政处罚",
                    "pid": 4,
                    "childrens": [{
                        "id": 16,
                        "name": "处罚信息",
                        "pid": 9,
                        "childrens": []
                    }]
                }]
            }
        ]
    }]
}