/**
     * 读取表格数据
     * @param path 文件路径
     * @param maxColIx 最大读取列
     * @return
     */
    public static List<List<String>> readXlsx(String path,int maxColIx){
        URL url = null;
        InputStream fin = null;
        XSSFWorkbook xssfWorkbook = null;
        try {
            url = new URL(path);
            fin = url.openStream();
            xssfWorkbook = new XSSFWorkbook(fin);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        List<List<String>> result = new ArrayList<>();
        // 循环当前页，并处理当前循环页
        XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
        // 处理当前页，循环读取每一行 rowNum:从第几行开始读取
        for (int rowNum = 1; rowNum <= xssfSheet.getLastRowNum(); rowNum++) {
            XSSFRow row = xssfSheet.getRow(rowNum);
            int minColIx = row.getFirstCellNum();
//            int maxColIx = xssfRow.getLastCellNum();//返回的是最后一列的列数，即等于总列数
            List<String> rowList = new ArrayList<String>();
            for (int j = minColIx; j < maxColIx; j++) {
                String str = "";
                XSSFCell cell = row.getCell(j);
                if (null != cell) {
                    switch (cell.getCellType()) {
                        case NUMERIC: // 数值型
                            DecimalFormat df=new DecimalFormat("0");
                            str=df.format(cell.getNumericCellValue());
                            System.out.print(",数字:"+str);
                            break;
                        case STRING: // 字符串型
                            str = cell.getStringCellValue();
                            System.out.print(",字符串:"+str);
                            break;
                        case FORMULA: // 公式
                            str = cell.getCellFormula() + "";
                            break;
                        case BLANK: // 空值
                            break;
                        case BOOLEAN: //布尔型
                            str = cell.getBooleanCellValue()+"";
                            break;
                        case ERROR: // 错误
                            break;
                        default:
                            System.out.print("未知类型   ");
                            break;
                    }
                }
                rowList.add(str);
            }
            result.add(rowList);
        }
        return result;
    }