poi从excel中读取父子关系型（树形）数据结构到数据库

今天遇到一个问题，就是excel中的数据是树形的，需要读进数据库，并保存树形结构，

excel结构，程序代码如下。

其中“描述“和”提升意见“只是某记录的属性，一级，二级，三级，四级，五级是该记录的层级，一级最高，为根。

程序如下：

基础数据结构：KeyQualityEntity

public class KeyQualityEntity extends Base implements java.io.Serializable {
	private static final long serialVersionUID = 5454155825314635342L;

	private Long id;
	/** 名称 */
	private String name;
	/** 描述 */
	private String detail;
	/** 提升建议 */
	private String promptAdvice;

	/** 上级 */
	private KeyQualityEntity parent;
	/** 等级 */
	private Integer level;

    private Long parentId;

	// columns END

	public KeyQualityEntity() {
	}

	public KeyQualityEntity(Long id) {
		this.id = id;
	}

	public KeyQualityEntity setId(Long value) {
		pUpdate("id", id);
		this.id = value;
		return this;
	}

	public java.lang.Long getId() {
		return this.id;
	}

	public java.lang.String getName() {
		return this.name;
	}

	public KeyQualityEntity setName(String value) {
		pUpdate("name", name);
		this.name = value;
		return this;
	}

	public java.lang.String getDetail() {
		return detail;
	}

	public KeyQualityEntity setDetail(String detail) {
		pUpdate("detail", detail);
		this.detail = detail;
		return this;
	}

	public java.lang.String getPromptAdvice() {
		return promptAdvice;
	}

	public KeyQualityEntity setPromptAdvice(String promptAdvice) {
		pUpdate("promptAdvice", promptAdvice);
		this.promptAdvice = promptAdvice;
		return this;
	}

	public KeyQualityEntity getParent() {
		return parent;
	}

	public Integer getLevel() {
		return level;
	}

	public KeyQualityEntity setParent(KeyQualityEntity parent) {
		if (parent != null)
			pUpdate("parentId", parent.getId());
		this.parent = parent;
		return this;
	}

	public KeyQualityEntity setLevel(Integer level) {
		pUpdate("level", level);
		this.level = level;
		return this;
	}

    public Long getParentId() {
        return parentId;
    }

    public KeyQualityEntity setParentId(Long parentId) {
        pUpdate("parentId",parentId);
        this.parentId = parentId;
        return this;
    }
}

操作类：

public void readExcel() throws IOException {
		InputStream is = new FileInputStream("C:\\Users\\liu\\Desktop\\素质点 (1).xls");

		HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);

		// 循环工作表Sheet
		for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
			HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
			if (hssfSheet == null) {
				continue;
			}
			Long previousId = null;// 上条记录的id
			Integer previousLevel = 1;// 上条记录的等级

			// 循环行Row
			// 第一行为说明，不进行读取
			for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
				HSSFRow hssfRow = hssfSheet.getRow(rowNum);
				if (hssfRow == null) {
					continue;
				}
				KeyQualityEntity kqe = new KeyQualityEntity();
				// 设置描述
				kqe.setDetail(hssfRow.getCell(0).getStringCellValue());
				// 设置提升建议
				kqe.setPromptAdvice(hssfRow.getCell(1).getStringCellValue());

				// 循环列Cell
				// 0：描述 1：提升意見 2：一級 3：二級 4：三級 5：四級 6：五級
				Integer level; // 标示当前行的层级
				for (int coluNum = 2; coluNum <= 6; coluNum++) {
					HSSFCell hssfCell = hssfRow.getCell(coluNum);
					// 如果该列为null则循环下一列
					if (hssfCell == null) {
						continue;
					}
					String name = hssfRow.getCell(coluNum).getStringCellValue();
					if (StringUtils.isNotBlank(name)) {
						level = coluNum - 1;
						kqe.setName(name);
						kqe.setLevel(level);
						// 如果上条记录的等级比本条记录等级小，则说明上条记录是该记录的父亲，更新 previousId和
						// previousLevel
						if (previousLevel < level) {
							/*
							 * 伪代码
							 * kqe.setParent(new
							 * KeyQualityEntity(previousId));   //设置上条记录的id为本记录父亲id
							 * kqe.save();       //保存进数据库并设置保存后id在kqe里
							 */
							previousId = kqe.getId();
							previousLevel = level;
						} else {
							/**
							  伪代码，查询按id倒序的等级等于当前记录等级level的第一条数据，如果结果为null，说明是第一个根
							  ，设置parentId为null，如果有结果，则设置当前记录parentId为查出来的记录的parentId

							List<String> usePara = new ArrayList<>();
							usePara.add("order by id desc");
							ListResult<KeyQualityEntity> result = generalBeanDao.query(new KeyQualityEntity().setLevel(level), "keyQualityEntity",
									null, usePara);
							List<KeyQualityEntity> keyQualityEntities = result.getList();
							if (CollectionUtils.isEmpty(keyQualityEntities)) {
								kqe.setParent(new KeyQualityEntity(null));
							} else {
								kqe.setParent(new KeyQualityEntity(keyQualityEntities.get(0).getParentId()));
							}
							*/
							kqe.save(); //  保存kqe到数据库，得到保存后id
							previousId = kqe.getId(); //更新    previousId和   previousLevel
							previousLevel = level;
						}
					}
				}
			}
		}
	}