以下代码是在maven工程中编写，maven地址

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.15</version>
</dependency>

代码示例 可读取合并单元格的信息

java">public class PoiUtils {
	private static NumberFormat numberFormat = NumberFormat.getInstance();
	static {
		//关闭分组显示
		numberFormat.setGroupingUsed(false);
	}

	/**
	 * @Comments ：读取Excel文件
	 * @param file 待读取的文件(通过前端上传的文件信息)
	 * @param heads 表头对应的值，用于返回map的key
	 * @param startRows 起始行
	 * @param startCols 起始列
	 * @return
	 * @Author ：乐享生活522
	 * @Date ：2019年10月15日 下午7:46:23
	 */
	public static List<Map<String, Object>> readExcelFile(MultipartFile file, String[] heads, int startRows, int startCols) {
		InputStream fis = null;
		Workbook book = null;
		String fileName = file.getOriginalFilename();
		String fileType = fileName.substring(fileName.lastIndexOf(".") + 1);
		Map<String, Object> mergeRowsMap = new HashMap<>();
		List<Map<String, Object>> rowList = new ArrayList<>();
		try {
			fis = file.getInputStream();
			if (fileType.equals("xls")) {
				book = new HSSFWorkbook(fis);
			} else if (fileType.equals("xlsx")) {
				book = new XSSFWorkbook(fis);
			} else {
				return null;
			}
			Sheet sheet = book.getSheetAt(0);
			int totalRows = sheet.getLastRowNum() + 1;//获取最后一行的序号（总行数）
			for (int i = startRows; i < totalRows; i++) {
				Row row = sheet.getRow(i);
				if (row != null) {
					Map<String, Object> rowMap = new HashMap<>();
					for (int j = startCols; j < heads.length; j++) {
						Cell cell = row.getCell(j);
						String cellValue = "";
						if (cell != null) {
							switch (cell.getCellType()) {
							case Cell.CELL_TYPE_STRING:
								cellValue = cell.getStringCellValue();
								break;
							case Cell.CELL_TYPE_NUMERIC:
								if (DateUtil.isCellDateFormatted(cell)) {
									cellValue = DateUtils.format(DateUtil.getJavaDate(cell.getNumericCellValue()), Pattern.YMD);
								} else {
									cellValue = numberFormat.format(cell.getNumericCellValue());
								}
								break;
							case Cell.CELL_TYPE_BOOLEAN:
								cellValue = cell.getBooleanCellValue() ? "是" : "否";
								break;
							case Cell.CELL_TYPE_FORMULA:
								cellValue = cell.getCellFormula();
								break;
							case Cell.CELL_TYPE_BLANK:
								cellValue = "";
								break;
							case Cell.CELL_TYPE_ERROR:
								cellValue = "非法字符";
								break;
							default:
								cellValue = "";
								break;
							}
						}
						Map<String, Object> mergeCellMap = isMergedRegion(sheet, i, j);
						if (MapUtils.isNotEmpty(mergeCellMap)) {
							int firstRow = MapUtils.getIntValue(mergeCellMap, "firstRow");
							int firstColumn = MapUtils.getIntValue(mergeCellMap, "firstColumn");
							int lastRow = MapUtils.getIntValue(mergeCellMap, "lastRow");
							if (StringUtils.isEmpty(cellValue) && firstRow < i && lastRow >= i && firstColumn == j) {
								cellValue = MapUtils.getString(mergeRowsMap, heads[j], "");
							} else {
								mergeRowsMap.put(heads[j], cellValue);
							}
						}
						/*if (mergeList.contains(heads[j])) {//存在合并列中
							if (StringUtils.isEmpty(cellValue)) {
								cellValue = MapUtils.getString(mergeRowsMap, heads[j], "");
							} else {
								mergeRowsMap.put(heads[j], cellValue);
							}
						}*/
						rowMap.put(heads[j], cellValue);
					}
					rowList.add(rowMap);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (book != null) {
				try {
					book.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (fis != null) {
				try {
					fis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return rowList;
	}

	/**
	 * @Comments ：判断当前单元格是否合并
	 * @param sheet
	 * @param row 当前行
	 * @param column 当前列
	 * @Author ：乐享生活522
	 * @Date ：2019年10月15日 下午7:15:13
	 */
	private static Map<String, Object> isMergedRegion(Sheet sheet, int row, int column) {
		int sheetMergeCount = sheet.getNumMergedRegions();
		for (int i = 0; i < sheetMergeCount; i++) {
			CellRangeAddress range = sheet.getMergedRegion(i);
			int firstColumn = range.getFirstColumn();
			int lastColumn = range.getLastColumn();
			int firstRow = range.getFirstRow();
			int lastRow = range.getLastRow();
			if (row >= firstRow && row <= lastRow) {
				if (column >= firstColumn && column <= lastColumn) {
					Map<String, Object> resultMap = new HashMap<>();
					resultMap.put("firstRow", firstRow);
					resultMap.put("lastRow", lastRow);
					resultMap.put("firstColumn", firstColumn);
					return resultMap;
				}
			}
		}
		return null;
	}

}