POI简单excel数据导入、获取

1. 引入pom文件地址

     
    org.apache.poi    
    poi-ooxml    
    3.9

2. 导入代码

   @PostMapping("/importData")
    public void importData(@RequestParam(value = "file") MultipartFile file) throws IOException {
        //获取文件名
        String filename = file.getOriginalFilename();
        //创建Workbook工作薄对象，表示整个excel
        Workbook workbook = null;
        try {
            //获取excel文件的io流
            InputStream is = file.getInputStream();
            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
            if (filename.endsWith("xls")) {
                //2003
                workbook = new HSSFWorkbook(is);
            } else if (filename.endsWith("xlsx")) {
                //2007
                workbook = new XSSFWorkbook(is);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        List list = new ArrayList();
        if (workbook != null) {
            for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
                //获得当前sheet工作表
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if (sheet == null) {
                    continue;
                }
                //获得当前sheet的开始行
                int firstRowNum = sheet.getFirstRowNum();
                //获得当前sheet的结束行
                int lastRowNum = sheet.getLastRowNum();
                //循环所有行
                for (int rowNum = firstRowNum; rowNum <= lastRowNum; rowNum++) {
                    //获得当前行
                    Row row = sheet.getRow(rowNum);
                    if (row == null) {
                        continue;
                    }
                    //获得当前行的开始列
                    short firstCellNum = row.getFirstCellNum();
                    //获得当前行的列数
                    short lastCellNum = row.getLastCellNum();
                    String[] cells = new String[row.getPhysicalNumberOfCells()];
                    //循环当前行
                    for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
                        Cell cell = row.getCell(cellNum);
                        cells[cellNum] = getCellValue(cell);
                    }
                    list.add(cells);
                }
            }
            workbook.close();
        }
        //查看效果     
        for (String[] strings : list) {
            System.out.println(Arrays.toString(strings));
        }
    }

    /**
     * 获取cell方法
     * @param cell
     * @return
     */
    public static String getCellValue(Cell cell) {
        String cellValue = "";
        if (cell == null) {
            return cellValue;
        }
        //把数字当成String来读，避免出现1读成1.0的情况
        if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }
        //判断数据的类型
        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_NUMERIC: //数字
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式
                cellValue = String.valueOf(cell.getCellFormula());
                break;
            case Cell.CELL_TYPE_BLANK: //空值
                cellValue = "";
                break;
            case Cell.CELL_TYPE_ERROR: //故障
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知类型";
                break;
        }
        return cellValue;
    }

3. 这只是一个简单的可以读取excel表格中数据的方法，后续操作可在此代码基础上继续进行啦。当然，本块代码在excel文件中有空格的时候，有时候会产生空指针的错误，还需要同步进行改正