一：导入jar包

二：后端代码：

@Service("bookingOrderServiceImpl")
public  class BookingOrderServiceImpl extends BaseServiceImpl<BookingOrder> implements BookingOrderService {

    @Autowired
    private BookingOrderDao bookingOrderDao;

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("YYYY-MM-DD hh:mm:ss"); //格式时间

    @Override
    @Transactional
    public void uploadExcel(MultipartFile file) {

        try {
            System.out.println("---------------------------");
            Workbook workbook = new HSSFWorkbook(file.getInputStream());//根据上传的输入流创建workbook
           // Workbook workbook = new XSSFWorkbook(file.getInputStream());
            Sheet sheet = workbook.getSheetAt(0);
            int lastRowNum = sheet.getLastRowNum();//获取这个sheet中最后一行数据，为了循环

            BookingOrder bookingOrder = null;
            Row row = null;

            for (int i = 0; i <= lastRowNum; i++) {
                row = sheet.getRow(i+1);//注意这是数据的第一行起  不算表头所以加一
                bookingOrder = new BookingOrder();
                String predictTheSingleNumber = row.getCell(0).getStringCellValue();
                bookingOrder.setPredictTheSingleNumber(predictTheSingleNumber);
                String name = row.getCell(1).getStringCellValue();
                System.out.println("name===="+name);
                bookingOrder.setName(name);
                String organ = row.getCell(2).getStringCellValue();
                bookingOrder.setOrgan(organ);
                String customerOrProjectName = row.getCell(3).getStringCellValue();
                bookingOrder.setCustomerOrProjectName(customerOrProjectName);
                String sort = row.getCell(4).getStringCellValue();
                bookingOrder.setSort(sort);
                String productCode = row.getCell(5).getStringCellValue();
                bookingOrder.setProductCode(productCode);
                String model = row.getCell(6).getStringCellValue();
                bookingOrder.setModel(model);
                System.out.println("model==="+model);
                String amount = row.getCell(7).getStringCellValue();
                System.out.println("数量====="+amount);
                bookingOrder.setAmount(new Integer(amount));
                String price = row.getCell(8).getStringCellValue();
                bookingOrder.setPrice(Double.valueOf(price));
                String sales = row.getCell(9).getStringCellValue();
                bookingOrder.setSales(Double.valueOf(sales));
                String month = row.getCell(10).getStringCellValue();
                System.out.println("month==="+month);
                bookingOrder.setMonth(simpleDateFormat.parse(month));//出货月份
                String date = row.getCell(11).getStringCellValue();
                System.out.println("date===="+date);
                System.out.println("date====转换后"+simpleDateFormat.parse(date));
                bookingOrder.setDate(simpleDateFormat.parse(date));//预估出货日期
               // String importtime = row.getCell(12).getStringCellValue();
                bookingOrder.setImportTime(new Timestamp(System.currentTimeMillis()));
                this.save(bookingOrder);
                System.out.println("保存结束");
            }
        } catch (Exception e) {
            e.printStackTrace();
            LogUtils.error("导入结束"+e);
        }
    }

 三：前端代码：

 function productPriceImport(e){
            excel_import(e,{
                title:"${message("预售订单")}",
                url:"/b2b/booking_order/upload_Excel.jhtml",//导入excel的方法
                template:"/resources/template/product/bookingorder.xls",//这是模板的路径
                callback:function(resultMsg){
                    $("#searchBtn").click();
                }
            })
        }




 <div class="buttonWrap">
            <div class="flag-wrap flagImp-wrap">
                <a href="javascript:void(0);" class="iconButton" id="export1Button">
                    <span class="impIcon">&nbsp;</span>导出/导入
                </a>
                <ul class="flag-list">
                    <li><a href="javascript:void(0)" onclick="selectToExcel('#table-m1','预售订单')"><i class="flag-imp02"></i>选择导出</a></li>
                    <li><a href="javascript:void(0)" onclick="productPriceImport(this)"><i class="flag-imp01"></i>${message("导入")}</a></li>
[#--                    <li><a href="javascript:void(0)" onclick="openExportList('#table-m1','计划偏差率导出',10000)"><i class="flag-imp02"></i>条件导出</a></li>--]
                </ul>
            </div>
        </div>

注意事项：导入的excel表里面的数据类型 要和后端代码保持一致

                哪一行的数据不能搞错序号

POI操作报错-- java.lang.NoClassDefFoundError: org/apache/commons/math3/util/ArithmeticUtils 解决：

POI-4.1.1，操作报错如下：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/math3/util/ArithmeticUtils

解决：需要引用 commons-math3-3.6.1.jar 

位置：POI-->lib目录下