包含了父子关系的单位对象的List数据转成树状结构

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需求

将一个包含了父子关系的单位对象的 List 数据，转成一个带层级关系的数据。文章来源地址https://www.toymoban.com/news/detail-529883.html

原始数据，用 json 格式展示

[
    {
        "areaName": "广东省",
        "areaSeq": "BQ6Ig2ewmu51ja1XlUQ",
        "credNum": "13440000455857174Y",
        "delFlag": "0",
        "type": "1",
        "unitCode": "GEqONvGif1pkgeypVsW",
        "unitName": "广东省残疾人联合会"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "27DYBhqxPhWkxyyShIZ",
        "type": "2",
        "unitCode": "5coZCC2viVbTAotmTIW",
        "unitName": "测试部门"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "114400006715714882",
        "delFlag": "0",
        "type": "1",
        "unitCode": "27DYBhqxPhWkxyyShIZ",
        "unitName": "测试"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "1yfUGoRc0EVyejByf9a",
        "type": "2",
        "unitCode": "iaqpYx0lUKzrum8oYMl",
        "unitName": "事项测试部门43"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000006941354C",
        "delFlag": "0",
        "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
        "type": "1",
        "unitCode": "1yfUGoRc0EVyejByf9a",
        "unitName": "市场处"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000553612461J",
        "delFlag": "0",
        "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
        "type": "1",
        "unitCode": "6DZWgfIUzHa0wk8ixKz",
        "unitName": "广东省人力资源和社会保障厅"
    },
    {
        "areaName": "中国",
        "areaSeq": "VkThH0HKYsm6uLB1vSU",
        "delFlag": "0",
        "parentUnitCode": "N0mcwIHkncfZJG3jj0E",
        "type": "2",
        "unitCode": "k2OHsF7ZnpYADkJbiGi",
        "unitName": "教育厅-1部门"
    },
    {
        "areaName": "中国",
        "areaSeq": "VkThH0HKYsm6uLB1vSU",
        "delFlag": "0",
        "parentUnitCode": "N0mcwIHkncfZJG3jj0E",
        "type": "1",
        "unitCode": "TLgo7tY9HbD9TMZqRxL",
        "unitName": "教育厅-1单位"
    },
    {
        "areaName": "中国",
        "areaSeq": "VkThH0HKYsm6uLB1vSU",
        "credNum": "11440000006940116U",
        "delFlag": "0",
        "type": "1",
        "unitCode": "N0mcwIHkncfZJG3jj0E",
        "unitName": "广东省教育厅"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "pylto8i5gezxWPsLulf",
        "type": "2",
        "unitCode": "dAVzZSmgFAuBhk05Tmw",
        "unitName": "审批科"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440100MB2C91891K",
        "delFlag": "0",
        "type": "1",
        "unitCode": "pylto8i5gezxWPsLulf",
        "unitName": "广州市市场监督管理局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "6DZWgfIUzHa0wk8ixKz",
        "type": "2",
        "unitCode": "FMZpUJ3fCtnllZAAXPT",
        "unitName": "测试部门-2-1"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
        "type": "2",
        "unitCode": "hMAxUNUDfBdlRT6P5NT",
        "unitName": "文物局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "xWKRcZWjYTtuy5gMqmq",
        "type": "2",
        "unitCode": "P0ZjaRLjCaTmk1vCs0t",
        "unitName": "事项测试子部门"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "114400000069411352",
        "delFlag": "0",
        "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
        "type": "1",
        "unitCode": "xWKRcZWjYTtuy5gMqmq",
        "unitName": "审核处"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
        "type": "2",
        "unitCode": "PCkQHkCqBQ8G433PlpN",
        "unitName": "准入处"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000MB2C87614P",
        "delFlag": "0",
        "type": "1",
        "unitCode": "8wUPbECBVx75UqQ6gjM",
        "unitName": "文旅局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "rBzaXFIRKovid7dgbyY",
        "type": "2",
        "unitCode": "KZlSpr0M9svbTxswtVp",
        "unitName": "001部门"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000K30220376L",
        "delFlag": "0",
        "type": "1",
        "unitCode": "rBzaXFIRKovid7dgbyY",
        "unitName": "密码局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "t9nq70CPS9PCwrL7ury",
        "type": "2",
        "unitCode": "IA6mo3clsYao9qRqVKB",
        "unitName": "测试单位4-部门2"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "z5N2zSetiup81QAJzok",
        "type": "2",
        "unitCode": "PqIu1vdrPEMcgw9QLil",
        "unitName": "测试单位-部门2"
    },
    {
        "areaName": "中国",
        "areaSeq": "VkThH0HKYsm6uLB1vSU",
        "delFlag": "0",
        "parentUnitCode": "yK78GEa2MyLoTsv7cl8",
        "type": "2",
        "unitCode": "oL5ku79eKjSD3wsonE2",
        "unitName": "测试单位3-部门2"
    },
    {
        "areaName": "中国",
        "areaSeq": "VkThH0HKYsm6uLB1vSU",
        "delFlag": "0",
        "parentUnitCode": "yK78GEa2MyLoTsv7cl8",
        "type": "2",
        "unitCode": "NZ7nrjiR2Ipp4jUvwdg",
        "unitName": "测试单位3-部门1"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "z5N2zSetiup81QAJzok",
        "type": "2",
        "unitCode": "IyfejZ9DXBX24OararK",
        "unitName": "测试单位-部门1"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "rdF29TiDg8A6uAhtwy8",
        "type": "2",
        "unitCode": "iAeyIFab9QYfW1qnqIB",
        "unitName": "测试单位2-部门2"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "rdF29TiDg8A6uAhtwy8",
        "type": "2",
        "unitCode": "4AE4Eec19qlquekC67b",
        "unitName": "测试单位2-部门1"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "t9nq70CPS9PCwrL7ury",
        "type": "2",
        "unitCode": "wBaWrcxKXAORTsr7PXr",
        "unitName": "测试单位4-部门1"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "EG3iCBPm7bldC2esW1f",
        "type": "2",
        "unitCode": "RmCztFLB1Ip4Tl0Lcyk",
        "unitName": "hello单位-1001部门"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000006940140C",
        "delFlag": "0",
        "type": "1",
        "unitCode": "EG3iCBPm7bldC2esW1f",
        "unitName": "市民政局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "wl4XDGhZg71ntFXT8aL",
        "type": "2",
        "unitCode": "l29g1aszyjTCLmGgKMU",
        "unitName": "one测试部门"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000006939908P",
        "delFlag": "0",
        "type": "1",
        "unitCode": "wl4XDGhZg71ntFXT8aL",
        "unitName": "市医保局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000006939799Q",
        "delFlag": "0",
        "type": "1",
        "unitCode": "t9nq70CPS9PCwrL7ury",
        "unitName": "市人社局"
    },
    {
        "areaName": "中国",
        "areaSeq": "VkThH0HKYsm6uLB1vSU",
        "credNum": "11440000MB2D023437",
        "delFlag": "0",
        "type": "1",
        "unitCode": "yK78GEa2MyLoTsv7cl8",
        "unitName": "食药监局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "11440000MB2D02159F",
        "delFlag": "0",
        "type": "1",
        "unitCode": "rdF29TiDg8A6uAhtwy8",
        "unitName": "市公安局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "credNum": "114400000069401674",
        "delFlag": "0",
        "type": "1",
        "unitCode": "z5N2zSetiup81QAJzok",
        "unitName": "市税务局"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "parentUnitCode": "sVmQT735qD3Rwyu9wit",
        "type": "2",
        "unitCode": "6lMMRgrf6OBXe68P8C2",
        "unitName": "研发事业部"
    },
    {
        "areaName": "广州市",
        "areaSeq": "nbaLYQdhotXvAs2QXaW",
        "delFlag": "0",
        "type": "1",
        "unitCode": "sVmQT735qD3Rwyu9wit",
        "unitName": "心猿码意软件"
    }
]

实现代码：

/**
 * <h2>窗口单位信息树</h2>
 * @author 心猿码意
 * @date 2023-04-25 18:23:21
 **/
@Data
public class WinUnitTreeVo implements Serializable {
    @ApiModelProperty(value = "所属地区名称")
    private List<WinUnitTreeVo> childUnit;
    @ApiModelProperty(value = "父级机构主键")
    private String parentUnitCode;
    @ApiModelProperty(value = "单位编号")
    private String unitCode;
    @ApiModelProperty(value = "单位名称")
    private String unitName;
}

@Data
public class PlatformUnitVo {

    /**
     * 所属单位主键
     */
    private String unitCode;

    /**
     * 部门名称
     */
    private String unitName;

    /**
     * 父级机构主键
     */
    private String parentUnitCode;

    /**
     * 是否主部门：0否，1是
     */
    private String defaultFlag;

    /**
     * 社会统一信用代码
     */
    private String credNum;

    /**
     * 删除状态：1删除，0否
     */
    private String delFlag;

    /**
     * 单位所属地区编码
     */
    private String areaSeq;

    /**
     * 单位所属地区名称
     */
    private String areaName;

    /**地区行政区划代码*/
    private String areaCode;

    /**
     * 父级地区主键
     */
    private String parentAreaSeq;

    /**
     * 父级地区名称
     */
    private String parentAreaName;

    /**
     * 组织机构类型(1:单位，2:部门)
     */
    private String type;

    /**
     * 附加属性值集合
     */
    private List<ExtraAttrVo> extraAttrs;
}

public List<WinUnitTreeVo> getWorkitemUnitList(String unitCodes) {
        List<PlatformUnitVo> platformUnitVos = "前面的json";
        List<WinUnitTreeVo> winUnitTreeVoList = new ArrayList<>();
        platformUnitVos.stream().forEach(vo ->{
            WinUnitTreeVo winUnitTreeVo = new WinUnitTreeVo();
            winUnitTreeVo.setUnitCode(vo.getUnitCode());
            winUnitTreeVo.setUnitName(vo.getUnitName());
            winUnitTreeVo.setParentUnitCode(vo.getParentUnitCode());
            winUnitTreeVoList.add(winUnitTreeVo);
        });
        List<String> ids = winUnitTreeVoList.stream().map(WinUnitTreeVo::getUnitCode).collect(Collectors.toList());
        List<WinUnitTreeVo> tree = new ArrayList<>();
        for (WinUnitTreeVo winUnitTreeVo : winUnitTreeVoList) {
            //找到根节点
            if (winUnitTreeVo.getParentUnitCode() == null || !ids.contains(winUnitTreeVo.getParentUnitCode())) {
                tree.add(findChildren(winUnitTreeVo, winUnitTreeVoList));
            }
        }
        return tree;
    }

    private WinUnitTreeVo findChildren(WinUnitTreeVo winUnitTreeVo, List<WinUnitTreeVo> list) {
        List<WinUnitTreeVo> children = new ArrayList<>();
        for (WinUnitTreeVo node : list) {
            if (StringUtils.isNotBlank(node.getParentUnitCode()) && node.getParentUnitCode().equals(winUnitTreeVo.getUnitCode())) {
                //递归调用
                children.add(findChildren(node, list));
            }
        }
        winUnitTreeVo.setChildUnit(children);
        return winUnitTreeVo;
    }

最终返回的单位树如下：

[
    {
        "queryType": null,
        "unitCode": "GEqONvGif1pkgeypVsW",
        "unitName": "广东省残疾人联合会",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": []
    },
    {
        "queryType": null,
        "unitCode": "27DYBhqxPhWkxyyShIZ",
        "unitName": "测试",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "5coZCC2viVbTAotmTIW",
                "unitName": "测试部门",
                "userCode": null,
                "parentUnitCode": "27DYBhqxPhWkxyyShIZ",
                "childUnits": []
            }
        ]
    },
    {
        "queryType": null,
        "unitCode": "N0mcwIHkncfZJG3jj0E",
        "unitName": "广东省教育厅",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "k2OHsF7ZnpYADkJbiGi",
                "unitName": "教育厅-1部门",
                "userCode": null,
                "parentUnitCode": "N0mcwIHkncfZJG3jj0E",
                "childUnits": []
            },
            {
                "queryType": null,
                "unitCode": "TLgo7tY9HbD9TMZqRxL",
                "unitName": "教育厅-1单位",
                "userCode": null,
                "parentUnitCode": "N0mcwIHkncfZJG3jj0E",
                "childUnits": []
            }
        ]
    },
    {
        "queryType": null,
        "unitCode": "pylto8i5gezxWPsLulf",
        "unitName": "广州市市场监督管理局",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "dAVzZSmgFAuBhk05Tmw",
                "unitName": "审批科",
                "userCode": null,
                "parentUnitCode": "pylto8i5gezxWPsLulf",
                "childUnits": []
            }
        ]
    },
    {
        "queryType": null,
        "unitCode": "8wUPbECBVx75UqQ6gjM",
        "unitName": "文旅局",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "1yfUGoRc0EVyejByf9a",
                "unitName": "市场处",
                "userCode": null,
                "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
                "childUnits": [
                    {
                        "queryType": null,
                        "unitCode": "iaqpYx0lUKzrum8oYMl",
                        "unitName": "事项测试部门43",
                        "userCode": null,
                        "parentUnitCode": "1yfUGoRc0EVyejByf9a",
                        "childUnits": []
                    }
                ]
            },
            {
                "queryType": null,
                "unitCode": "6DZWgfIUzHa0wk8ixKz",
                "unitName": "广东省人力资源和社会保障厅",
                "userCode": null,
                "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
                "childUnits": [
                    {
                        "queryType": null,
                        "unitCode": "FMZpUJ3fCtnllZAAXPT",
                        "unitName": "测试部门-2-1",
                        "userCode": null,
                        "parentUnitCode": "6DZWgfIUzHa0wk8ixKz",
                        "childUnits": []
                    }
                ]
            },
            {
                "queryType": null,
                "unitCode": "hMAxUNUDfBdlRT6P5NT",
                "unitName": "文物局",
                "userCode": null,
                "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
                "childUnits": []
            },
            {
                "queryType": null,
                "unitCode": "xWKRcZWjYTtuy5gMqmq",
                "unitName": "审核处",
                "userCode": null,
                "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
                "childUnits": [
                    {
                        "queryType": null,
                        "unitCode": "P0ZjaRLjCaTmk1vCs0t",
                        "unitName": "事项测试子部门",
                        "userCode": null,
                        "parentUnitCode": "xWKRcZWjYTtuy5gMqmq",
                        "childUnits": []
                    }
                ]
            },
            {
                "queryType": null,
                "unitCode": "PCkQHkCqBQ8G433PlpN",
                "unitName": "准入处",
                "userCode": null,
                "parentUnitCode": "8wUPbECBVx75UqQ6gjM",
                "childUnits": []
            }
        ]
    },
    {
        "queryType": null,
        "unitCode": "rBzaXFIRKovid7dgbyY",
        "unitName": "密码局",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "KZlSpr0M9svbTxswtVp",
                "unitName": "001部门",
                "userCode": null,
                "parentUnitCode": "rBzaXFIRKovid7dgbyY",
                "childUnits": []
            }
        ]
    },
    {
        "queryType": null,
        "unitCode": "EG3iCBPm7bldC2esW1f",
        "unitName": "市民政局",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "RmCztFLB1Ip4Tl0Lcyk",
                "unitName": "hello单位-1001部门",
                "userCode": null,
                "parentUnitCode": "EG3iCBPm7bldC2esW1f",
                "childUnits": []
            }
        ]
    },
    {
        "queryType": null,
        "unitCode": "wl4XDGhZg71ntFXT8aL",
        "unitName": "市医保局",
        "userCode": null,
        "parentUnitCode": null,
        "childUnits": [
            {
                "queryType": null,
                "unitCode": "l29g1aszyjTCLmGgKMU",
                "unitName": "one测试部门",
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