java 使用poi 導入Excel 數據到數據庫

由於我個人電腦裝的Excel是2016版本的，所以這地方我使用了XSSF 方式導入 。

1先手要制定一個Excel 模板 把模板放入javaWeb工程的某一個目錄下如圖：

2模板建好了后，先實現模板下載功能 下面是頁面jsp代碼在這里只貼出部分代碼

<!-- excel 導入小模塊窗口  -->
<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('正在導入，請稍等...');"><br/>
            <input id="uploadFile" name="file" type="file" style="width:330px"/><br/><br/>　　
            <input id="btnImportSubmit" class="btn btn-primary" type="submit" value="   導    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">下載模板</a>
        </form>
</div>

<input id="btnImport" class="btn btn-default" type="button" value="導入"/></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 (){//加載頁面時執行select2
         $("select").select2();
          //彈出導出窗口
            $("#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("請選擇檔口");
                }else{
                    layer.open({
                      type: 1,
                      skin: 'layui-layer-rim', //加上邊框
                      area: ['600px', '350px'], //寬高
                      content: $('#importBox')
                    });
                }
            });
      });

3下面是后台代碼Action 類

一：下載模板代碼

    /**
     * 下載模板
     * @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("菜品導入" + ".xlsx", "UTF-8"));
            out = response.getOutputStream();
            byte[] buffer = new byte[512]; // 緩沖區
            int bytesToRead = -1;
            // 通過循環將讀入的Excel文件的內容輸出到瀏覽器中
            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(); // 刪除臨時文件
        }
    }

二： 導入代碼

    /**
     * 導入
     * @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");
    }
    /**
     * 讀取Excel數據 
     * @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>();
        //循環工作表sheet
        //List<XSSFPictureData> picturesList = getPicturesList(workBook);//獲取所有圖片
        for(int numShett = 0;numShett<workBook.getNumberOfSheets();numShett++){
            XSSFSheet sheet  = workBook.getSheetAt(numShett);

             //調用獲取圖片
             Map<String, PictureData> pictureDataMap = getPictureDataMap(sheet, workBook);

if(sheet==null){
                continue;
            }
            //循環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));//菜品名稱
                Cell price = row.getCell(1);
                if(price==null){
                    continue;
                }
                dishes.setPrice(Double.parseDouble(getValue(price)));//優惠價格
                Cell oldPrice = row.getCell(2);
                if(oldPrice==null){
                    continue;
                }
                dishes.setOldPrice(Double.parseDouble(getValue(oldPrice)));//原價格
                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)));//打包費
                Cell stockNumber = row.getCell(6);
                if(stockNumber==null){//庫存為必填
                    continue;
                }
                dishes.setStockNumber(Integer.parseInt(getValue(stockNumber)));//每餐庫存
                Cell immediateStock = row.getCell(7);
                if(immediateStock==null){//當前庫存
                    continue;
                }
                dishes.setImmediateStock(Integer.parseInt(getValue(immediateStock)));//當前庫存
                Cell purchaseLimit = row.getCell(8);
                if(purchaseLimit==null){
                    continue;
                }
                dishes.setPurchaseLimit(Integer.parseInt(getValue(purchaseLimit)));//限購數量
                Cell restrictionType = row.getCell(9);
                
                if(restrictionType==null){
                    continue;
                }
                dishes.setRestrictionType(Integer.parseInt(getValue(restrictionType)));//限購方式
                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));//菜品詳情
                dishes.setCreateTime(new Date());
                Company company = companyService.load(importCompanyId);
                Stall stall = stallService.load(importStallId);
                dishes.setCompany(company);
                dishes.setStall(stall);

                 //set 圖片
                 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;
    }

 公司需求改變要增加導入圖片到又拍雲服務器，所以下面增加讀取excel圖片

    /**
     * 讀取Excel 中圖片
     * @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;
    }

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

注意：請用Poi  jar 3.9 版本 不然讀取圖片代碼會報錯