java 使用poi 导入Excel 数据到数据库

由于我个人电脑装的Excel是2016版本的，所以这地方我使用了XSSF 方式导入。

1先手要制定一个Excel 模板把模板放入javaWeb工程的某一个目录下如图：

2模板建好了后，先实现模板下载功能下面是页面jsp代码在这里只贴出部分代码

<!-- excel 导入小模块窗口  -->
<div id="importBox" class="" style="display: none;">
        <form id="importForm" action="<%=basePath%>book/dishes/backstageversion/list!importExcel" method="post" enctype="multipart/form-data"
            class="form-search" style="padding-left:20px;text-align:center;" onsubmit="loading('正在导入，请稍等...');"><br/>
            <input id="uploadFile" name="file" type="file" style="330px"/><br/><br/>　　
            <input id="btnImportSubmit" class="btn btn-primary" type="submit" value="   导    入   "/>
            <input type="hidden" id="importCompanyId" name="importCompanyId" value=""/>
            <input type="hidden" id="importStallId" name="importStallId" value=""/>
            <a href="<%=basePath%>book/dishes/backstageversion/list!exportOrder">下载模板</a>
        </form>
</div>

<input id="btnImport" class="btn btn-default" type="button" value="导入"/></li>

下面是js

    <!-- Bootstrap -->
    <link href="<%=path %>/res/admin/css/bootstrap.min.css" rel="stylesheet" type="text/css" /> 
    <link href="<%=path %>/res/admin/css/xy_css.css" rel="stylesheet" type="text/css">
    <link href="<%=path %>/res/admin/css/font-awesome.min.css" rel="stylesheet" type="text/css">
    <script src="<%=path %>/res/admin/js/jquery.min.js"></script>
    <script src="<%=path %>/res/admin/js/bootstrap.min.js"></script>
    <link href="<%=path %>/res/admin/jquery-select2/3.4/select2.css" rel="stylesheet" type="text/css" /> 
    <script src="<%=path %>/res/admin/jquery-select2/3.4/select2.min.js"></script>
    <script src="<%=path %>/res/admin/jquery-select2/3.4/select2_locale_zh-CN.js"></script>
    
    <script type="text/javascript" src="<%=basePath%>res/admin/js/layer/layer.js"></script>
    <script type="text/javascript">
      $(document).ready(function (){//加载页面时执行select2
         $("select").select2();
          //弹出导出窗口
            $("#btnImport").click(function(){
                var importStallId = $("#stallId  option:selected").val();
                var importCompanyId = $("#companyId option:selected").val();
                $("#importCompanyId").val(importCompanyId);
                $("#importStallId").val(importStallId);
                if(importStallId==null || importStallId==""){
                    alert("请选择档口");
                }else{
                    layer.open({
                      type: 1,
                      skin: 'layui-layer-rim', //加上边框
                      area: ['600px', '350px'], //宽高
                      content: $('#importBox')
                    });
                }
            });
      });

3下面是后台代码Action 类

一：下载模板代码

    /**
     * 下载模板
     * @throws IOException 
     */
    public void exportOrder() throws IOException{
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpServletResponse response = ServletActionContext.getResponse();
        File file = null;
        InputStream inputStream = null;
        ServletOutputStream out = null;
        try {
            request.setCharacterEncoding("UTF-8");
            String realPath = ServletActionContext.getServletContext().getRealPath("/");
            file = new File(realPath+"WEB-INF/mailtemplate/dishes.xlsx");
            inputStream = new FileInputStream(file);
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/msexcel");
            response.setHeader("content-disposition", "attachment;filename="
                    + URLEncoder.encode("菜品导入" + ".xlsx", "UTF-8"));
            out = response.getOutputStream();
            byte[] buffer = new byte[512]; // 缓冲区
            int bytesToRead = -1;
            // 通过循环将读入的Excel文件的内容输出到浏览器中
            while ((bytesToRead = inputStream.read(buffer)) != -1) {
                out.write(buffer, 0, bytesToRead);
            }
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null)
                inputStream.close();
            if (out != null)
                out.close();
            if (file != null)
                file.delete(); // 删除临时文件
        }
    }

二：导入代码

    /**
     * 导入
     * @throws IOException 
     */
    public void importExcel() throws IOException {
        List<Dishes> dishesList = getDishesList(file);
        if(dishesList !=null && dishesList.size()>0){
            for(Dishes dishes : dishesList){
                targetService.add(dishes);
            }
        }
        String basePath = ServletActionContext.getServletContext().getContextPath();
        ServletActionContext.getResponse().sendRedirect(basePath + "/book/dishes/backstageversion/list");
    }
    /**
     * 读取Excel数据 
     * @param filePath
     * @return List
     * @throws IOException
     */
    private List<Dishes> getDishesList(String filePath) throws IOException {
        XSSFWorkbook workBook= null;
        InputStream is = new FileInputStream(filePath);
        try {
            workBook = new XSSFWorkbook(is);
        } catch (Exception e) {
            e.printStackTrace();
        }
        Dishes dishes=null;
        List<Dishes> dishesList = new ArrayList<Dishes>();
        //循环工作表sheet
        //List<XSSFPictureData> picturesList = getPicturesList(workBook);//获取所有图片
        for(int numShett = 0;numShett<workBook.getNumberOfSheets();numShett++){
            XSSFSheet sheet  = workBook.getSheetAt(numShett);

//调用获取图片
Map<String, PictureData> pictureDataMap = getPictureDataMap(sheet, workBook);

if(sheet==null){
                continue;
            }
            //循环Row
            for(int rowNum=1;rowNum<=sheet.getLastRowNum();rowNum++){
                Row row = sheet.getRow(rowNum);
                if(row==null){
                    continue;
                }
                
                dishes = new Dishes();
                //Cell
                Cell dishesName = row.getCell(0);
                if(dishesName==null){
                    continue;
                }
                dishes.setName(getValue(dishesName));//菜品名称
                Cell price = row.getCell(1);
                if(price==null){
                    continue;
                }
                dishes.setPrice(Double.parseDouble(getValue(price)));//优惠价格
                Cell oldPrice = row.getCell(2);
                if(oldPrice==null){
                    continue;
                }
                dishes.setOldPrice(Double.parseDouble(getValue(oldPrice)));//原价格
                Cell summary = row.getCell(3);
                if(summary==null){
                    continue;
                }
                dishes.setSummary(getValue(summary));//菜品描述
                Cell online = row.getCell(4);
                if(online==null){
                    continue;
                }
                dishes.setOnline(Integer.parseInt(getValue(online)));//是否上下架
                Cell packCharge = row.getCell(5);
                if(packCharge==null){
                    continue;
                }
                dishes.setPackCharge(Double.parseDouble(getValue(packCharge)));//打包费
                Cell stockNumber = row.getCell(6);
                if(stockNumber==null){//库存为必填
                    continue;
                }
                dishes.setStockNumber(Integer.parseInt(getValue(stockNumber)));//每餐库存
                Cell immediateStock = row.getCell(7);
                if(immediateStock==null){//当前库存
                    continue;
                }
                dishes.setImmediateStock(Integer.parseInt(getValue(immediateStock)));//当前库存
                Cell purchaseLimit = row.getCell(8);
                if(purchaseLimit==null){
                    continue;
                }
                dishes.setPurchaseLimit(Integer.parseInt(getValue(purchaseLimit)));//限购数量
                Cell restrictionType = row.getCell(9);
                
                if(restrictionType==null){
                    continue;
                }
                dishes.setRestrictionType(Integer.parseInt(getValue(restrictionType)));//限购方式
                Cell sort = row.getCell(10);
                if(sort==null){
                    continue;
                }
                dishes.setSort(Integer.parseInt(getValue(sort)));//排序
                Cell contents = row.getCell(11);
                if(contents==null){
                    continue;
                }
                dishes.setContents(getValue(contents));//菜品详情
                dishes.setCreateTime(new Date());
                Company company = companyService.load(importCompanyId);
                Stall stall = stallService.load(importStallId);
                dishes.setCompany(company);
                dishes.setStall(stall);

//set 图片
PictureData pictureData = pictureDataMap.get(rowNum+"");
if(pictureData !=null){
String upImageUrl = UpImage(pictureData.getData());
dishes.setImage(upImageUrl);
}

                dishesList.add(dishes);
            }
        }
        return dishesList;
    }
    /**
     * 得到Excel表中的值
     * @param hssfCell
     * @return String
     */
    @SuppressWarnings("unused")
    private String getValue(Cell cell){
        DecimalFormat df = new DecimalFormat("###################.###########");
        if(cell.getCellType()==cell.CELL_TYPE_BOOLEAN){
            return String.valueOf(cell.getBooleanCellValue());
        }
        if(cell.getCellType()==cell.CELL_TYPE_NUMERIC){
            return String.valueOf(df.format(cell.getNumericCellValue()));
        }else{
            return String.valueOf(cell.getStringCellValue());
        }
    }

4： get set 方法

    private String file;
    
    private Long importCompanyId;
    private Long importStallId;

    public String getFile() {
        return file;
    }

    public void setFile(String file) {
        this.file = file;
    }

    public Long getImportCompanyId() {
        return importCompanyId;
    }

    public void setImportCompanyId(Long importCompanyId) {
        this.importCompanyId = importCompanyId;
    }

    public Long getImportStallId() {
        return importStallId;
    }

    public void setImportStallId(Long importStallId) {
        this.importStallId = importStallId;
    }

公司需求改变要增加导入图片到又拍云服务器，所以下面增加读取excel图片

    /**
     * 读取Excel 中图片
     * @param sheet
     * @param workBook
     * @return
     */
    private Map<String, PictureData> getPictureDataMap(XSSFSheet sheet,XSSFWorkbook workBook){
        Map<String, PictureData> map = new HashMap<String,PictureData>();
        for(POIXMLDocumentPart dr : sheet.getRelations()){
            if(dr instanceof XSSFDrawing){
                XSSFDrawing drawing = (XSSFDrawing) dr;
                List<XSSFShape> shapesList = drawing.getShapes();
                if(shapesList !=null && shapesList.size()>0){
                    for(XSSFShape shape : shapesList){
                        XSSFPicture pic = (XSSFPicture) shape;
                        XSSFClientAnchor anchor = pic.getPreferredSize();
                        CTMarker cTMarker = anchor.getFrom();
                        String picIndex = cTMarker.getRow()+"";
                        map.put(picIndex, pic.getPictureData());
                    }
                }
            }
        }
        return map;
    }

    /**
     * 上传图片到又拍云
     * @param bytes
     * @return
     */
    private  String UpImage(byte[] bytes){
        String fileName = UUID.randomUUID().toString() + ".jpg";
        String uploadURL = UpYunClient.upload(fileName, bytes);
        return uploadURL;
    }

注意：请用Poi jar 3.9 版本不然读取图片代码会报错