java 读取xlsx文件

public class ReadExcel {


    public static void main(String[] args) {
        Workbook wb = null;
        Sheet sheet = null;
        Row row = null;


        String filePath = "C:\\Users\\30713\\Desktop\\sg八大领域sql\\采集源数据表\\第八领域表字段.xlsx";

        wb = readExcel(filePath);
        if (wb != null) {
            try {
                List<List<List<Object>>> list = new ArrayList<>();

                System.err.println("页签数量：" + wb.getNumberOfSheets());
                // 循环页签
                for (int sheetNum = 0; sheetNum < wb.getNumberOfSheets(); sheetNum++) {
                    // 指定页签的值
                    sheet = wb.getSheetAt(sheetNum);
                    // 定义存放一个页签中所有数据的List
                    List<List<Object>> sheetList = new ArrayList<>();

                    System.err.println("行总数：" + sheet.getLastRowNum());
                    // 循环行
                    for (int rowNum = 0; rowNum <= sheet.getLastRowNum(); rowNum++) {
                        // 指定行的值
                        row = sheet.getRow(rowNum);
                        // 定义存放一行数据的List
                        List<Object> rowList = new ArrayList<>();

                        //下面可以获取具体表格内容
                         String eng = row.getCell(2).toString();
                         String ch = row.getCell(4).toString();

                        // 循环列
                        //System.err.println("列总数：" + row.getLastCellNum());
                        for (int cellNum = 0; cellNum < row.getLastCellNum(); cellNum++) {
                            Cell cell = sheet.getRow(rowNum).getCell(cellNum);
                            rowList.add(getStringCellValue(cell));
                        }
                        sheetList.add(rowList);
                    }
                    list.add(sheetList);
                }
                System.err.println(list.toString());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }


    //判断文件格式
    private static Workbook readExcel(String filePath){
        if(filePath==null){
            return null;
        }
        String extString = filePath.substring(filePath.lastIndexOf("."));

        try {
            @SuppressWarnings("resource")
            InputStream is = new FileInputStream(filePath);
            if(".xls".equals(extString)){
                return new HSSFWorkbook(is);
            }else if(".xlsx".equals(extString)){
                return new XSSFWorkbook(is);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }



    @SuppressWarnings("deprecation")
    public static String getStringCellValue(Cell cell) {
        String cellvalue = "";
        if (cell == null) {
            return "";
        }
        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_STRING:
                cellvalue = cell.getStringCellValue();
                break;
            case Cell.CELL_TYPE_NUMERIC:
                if (DateUtil.isCellDateFormatted(cell)) {
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                    Date date = cell.getDateCellValue();
                    cellvalue = sdf.format(date);
                } else {
                    cellvalue = String.valueOf(cell.getNumericCellValue());
                }
                break;
            case Cell.CELL_TYPE_BOOLEAN:
                cellvalue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_BLANK:
                cellvalue = "";
                break;
            default:
                cellvalue = "";
                break;
        }
        if (cellvalue == "") {
            return "";
        }
        return cellvalue;
    }
}