code: public static void appendTable(String[][] values, HSSFCellStyle[][] styles) {
          createXssfSheetIfNull();
          if (Checker.isNotNull(values)) {
              for (int i = 0; i < values.length; i++) {
                  XSSFRow row = xssfSheet.createRow(i);
                  for (int j = 0; j < values[i].length; j++) {
                      XSSFCell cell = row.createCell(j);
                      cell.setCellValue(values[i][j]);
                      if (Checker.isNotNull(styles)) {
                          int rowIndex = i < styles.length ? i : styles.length - 1;
                          int colIndex = j < styles[rowIndex].length ? j : styles[rowIndex].length - 1;
                          cell.setCellStyle(styles[rowIndex][colIndex]);
                      }
                  }
              }
          }
      }
docs: 添加一个表格
  
  @param values 值
  @param styles 样式