如何使用Apache POI從Java的合並單元格讀取？

Question

我有一個.xlsx格式的Excel文件。 我通過合並單元格來形成各種列來存儲數據。 我正在通過Java Web應用程序讀取Excel文件並將其數據保存到數據庫（MySQL）。 但是當我從合並的單元格中讀取時，我得到的是空值以及存儲在列和標題中的內容。 我正在使用Apache POI。 我的代碼是：

public static void excelToDBLogIN() {

    FileInputStream file = null;
    Boolean flag = true;
    ArrayList<String> rows = new ArrayList<String>();
    try {


        // here uploadFolder contains the path to the Login 3.xlsx file

        file = new FileInputStream(new File(uploadFolder + "Login 3.xlsx"));

        //Create Workbook instance holding reference to .xlsx file
        XSSFWorkbook workbook = new XSSFWorkbook(file);

        //Get first/desired sheet from the workbook
        XSSFSheet sheet = workbook.getSheetAt(0);

        //Iterate through each rows one by one
        Iterator<Row> rowIterator = sheet.iterator();


        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();

            //For each row, iterate through all the columns
            Iterator<Cell> cellIterator = row.cellIterator();

            String tuple = "";
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();

                //Check the cell type and format accordingly
                switch (cell.getCellType()) {

                        case Cell.CELL_TYPE_NUMERIC:                            

                        //int value = new BigDecimal(cell.getNumericCellValue()).setScale(0, RoundingMode.HALF_UP).intValue();
                        //tuple = tuple + String.valueOf(value) + "+";

                        DataFormatter objDefaultFormat = new DataFormatter();    

                        String str = objDefaultFormat.formatCellValue(cell);

                        tuple = tuple + str + "+";

                        break;

                    case Cell.CELL_TYPE_STRING:

                        tuple = tuple + cell.getStringCellValue() + "+";

                        break;

                    case Cell.CELL_TYPE_BLANK:                                                        

                        tuple = tuple + "" + "+";

                        break;


                }

            }

            rows.add(tuple);
            flag = true;

        }

    }    


    } catch (Exception e) {

        e.printStackTrace();

    } finally {

        if (file != null) {

            try {
                file.close();
                file = null;
            } catch (Exception e) {

                System.out.println("File closing operation failed");
                e.printStackTrace();
            }
        }                                 

    }

    }

}

我在網上搜索了答案，但沒有發現任何相關內容。

Answer 1

以下代碼段可能有所幫助。

while (rowIterator.hasNext()) {
        Row row = rowIterator.next();

        //For each row, iterate through all the columns
        Iterator<Cell> cellIterator = row.cellIterator();

        outer:
        while (cellIterator.hasNext()) {
            Cell cell = cellIterator.next();

            //will iterate over the Merged cells
            for (int i = 0; i < sheet.getNumMergedRegions(); i++) {
                CellRangeAddress region = sheet.getMergedRegion(i); //Region of merged cells

                int colIndex = region.getFirstColumn(); //number of columns merged
                int rowNum = region.getFirstRow();      //number of rows merged
                //check first cell of the region
                if (rowNum == cell.getRowIndex() && colIndex == cell.getColumnIndex()) {
                    System.out.println(sheet.getRow(rowNum).getCell(colIndex).getStringCellValue());
                    continue outer;
                }
            }
            //the data in merge cells is always present on the first cell. All other cells(in merged region) are considered blank
            if (cell.getCellType() == Cell.CELL_TYPE_BLANK || cell == null) {
                continue;
            }
            System.out.println(cell.getStringCellValue());
        }
    }