问如何使用POIjava[onHolding]读取单行中的excel多列？

EN

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

public class ApachePOIExcelRead {
    public static String cellValue = "";

    private static final String FILE_NAME = "./DealerExcel.xlsx";// ./PoiWorkbook.xlsx

    public static void main(String[] args) throws IOException {

        XSSFWorkbook workbook = new XSSFWorkbook(FILE_NAME);

        XSSFSheet sheet = workbook.getSheetAt(0);

        ArrayList<String> columndata = null;

        Iterator<Row> rowIterator = sheet.iterator();
        columndata = new ArrayList<>();

        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();
            Iterator<Cell> cellIterator = row.cellIterator();
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();

                if (row.getRowNum() > 0) { // To filter column headings
                    if (cell.getColumnIndex() == 0) {// To match column
                                                        // index
                        switch (cell.getCellType()) {
                        case Cell.CELL_TYPE_NUMERIC:
                            columndata.add(cell.getNumericCellValue() + "");
                            System.out.println("Number: "
                                    + cell.getNumericCellValue());
                            break;
                        case Cell.CELL_TYPE_STRING:
                            columndata.add(cell.getStringCellValue());
                            System.out.println("String: "
                                    + cell.getStringCellValue());
                            break;
                        }

                        System.out.println();
                    }

                }
            }
        }
    }
}