poi获取合并单元格内的第一行第一列的值

当读取如图所示的excel时，显示为第1行 第1列 的内容是：合并单元格

其它在合并单元格区域内的单元格不显示

示例代码如下：

 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;

 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.DataFormatter;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.Workbook;
 import org.apache.poi.ss.util.CellRangeAddress;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;

 public class TestExcel {
     private static final DataFormatter FORMATTER = new DataFormatter();

     /**
      * 获取单元格内容
      *
      * @param cell
      *            单元格对象
      * @return 转化为字符串的单元格内容
      */
     private static String getCellContent(Cell cell) {
         return FORMATTER.formatCellValue(cell);
     }

     public static boolean isMergedRegion(Sheet sheet, Cell cell) {
         // 得到一个sheet中有多少个合并单元格
         int sheetmergerCount = sheet.getNumMergedRegions();
         for (int i = 0; i < sheetmergerCount; i++) {
             // 得出具体的合并单元格
             CellRangeAddress ca = sheet.getMergedRegion(i);
             // 得到合并单元格的起始行, 结束行, 起始列, 结束列
             int firstC = ca.getFirstColumn();
             int lastC = ca.getLastColumn();
             int firstR = ca.getFirstRow();
             int lastR = ca.getLastRow();
             // 判断该单元格是否在合并单元格范围之内, 如果是, 则返回 true
             if (cell.getColumnIndex() <= lastC && cell.getColumnIndex() >= firstC) {
                 if (cell.getRowIndex() <= lastR && cell.getRowIndex() >= firstR) {
                     return true;
                 }
             }
         }
         return false;
     }

     public static String getMergedRegionValue(Sheet sheet, Cell cell) {
         // 获得一个 sheet 中合并单元格的数量
         int sheetmergerCount = sheet.getNumMergedRegions();
         // 便利合并单元格
         for (int i = 0; i < sheetmergerCount; i++) {
             // 获得合并单元格
             CellRangeAddress ca = sheet.getMergedRegion(i);
             // 获得合并单元格的起始行, 结束行, 起始列, 结束列
             int firstC = ca.getFirstColumn();
             int firstR = ca.getFirstRow();

             if (cell.getColumnIndex() == firstC && cell.getRowIndex() == firstR) {
                 return "第" + (cell.getRowIndex() + 1) + "行 第" + (cell.getColumnIndex() + 1) + "列 的内容是： "
                        + getCellContent(cell) + ",";
             }

         }
         return "";
     }

     private static String getExcelValue(String filePath, int sheetIndex) {
         String value = "";
         try {
             // 创建对Excel工作簿文件
             Workbook book = null;
             try {
                 book = new XSSFWorkbook(new FileInputStream(filePath));
             } catch (Exception ex) {
                 book = new HSSFWorkbook(new FileInputStream(filePath));
             }

             Sheet sheet = book.getSheetAt(sheetIndex);
             // 获取到Excel文件中的所有行数
             int rows = sheet.getPhysicalNumberOfRows();
             // System.out.println("rows:" + rows);
             // 遍历行

             for (int i = 0; i < rows; i++) {
                 // 读取左上端单元格
                 Row row = sheet.getRow(i);
                 // 行不为空
                 if (row != null) {
                     // 获取到Excel文件中的所有的列
                     int cells = row.getPhysicalNumberOfCells();
                     // System.out.println("cells:" + cells);

                     // 遍历列
                     for (int j = 0; j < cells; j++) {
                         // 获取到列的值
                         Cell cell = row.getCell(j);
                         if (cell != null) {
                             if (isMergedRegion(sheet, cell)) {
                                 value += getMergedRegionValue(sheet, cell);
                             } else {
                                 value += "第" + (i + 1) + "行 第" + (j + 1) + "列 的内容是： " + getCellContent(cell) + ",";
                             }

                         }
                     }

                 }
             }
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

         return value;

     }

     public static void main(String[] args) {

         String filePath = "F://example.xls";
         int sheetIndex = 0;

         String[] val = getExcelValue(filePath, sheetIndex).split(",");
         for (int i = 0; i < val.length; i++) {
             System.out.println(val[i]);
         }
     }
 }