JAVA实现Excel批量导入

一、模板下载：

先将模板放在项目WebRoot下的download文件夹下：

/**
     * @Title: downloadFile
     * @Description: 模板下载 (网络地址)
     * @param @param id
     * @param @param url
     * @param @param fileName
     * @param @param response
     * @param @param request
     * @param @throws Exception
     * @return void
     * @throws
     */
    @RequestMapping(value = "/downloadFile")
    public void downloadFile(String url, String fileName,
            HttpServletResponse response,HttpServletRequest request) throws Exception{

        //要对文件名称进行编码
        fileName = java.net.URLEncoder.encode(fileName,"utf-8");
        response.addHeader("Content-Disposition","attachment;filename=" + fileName+";filename*=utf-8''"+fileName);
        response.setContentType("application/octet-stream"); //设置文件MIME类型  

        OutputStream out =null;
        InputStream  in=null;

        //获取网站部署路径(通过ServletContext对象)，用于确定下载文件位置，从而实现下载
        //String path = request.getServletContext().getRealPath("/");
        //url = path + "download\\" + "我的客户导入模板.xls";

        try {

            URL urlPath = new URL(url);// 创建URL对象
            in = urlPath.openStream();// 获取url中的输入流
            out = response.getOutputStream();
            BufferedInputStream bis = new BufferedInputStream(in);
            BufferedOutputStream bos = new BufferedOutputStream(out);

            byte[] buff = new byte[20480];
            int b = 0;
            while (-1 != (b = bis.read(buff))) {
                bos.write(buff, 0, b);
            }
            bis.close();
            bos.flush();
            bos.close();
        }catch(Exception e){
            e.printStackTrace();
        }

        finally {
            if(out!=null)out.close();
            if(in!=null)in.close();
        }
    }

/**
     *
     * @Title: download
     * @Description: 下载本地文件
     * @param @param path
     * @param @param response
     * @param @param request
     * @return void
     * @throws
     */
    @RequestMapping(value = "/download")
    public void download(String type, HttpServletResponse response, HttpServletRequest request) {

        User u = getUser(request.getSession());//SessionUtils.getUser(request.getSession());

        //获取网站部署路径(通过ServletContext对象)，用于确定下载文件位置，从而实现下载
        //path = request.getServletContext().getRealPath("/") + "download\\" + "我的客户导入模板.xls";
        String path = request.getServletContext().getRealPath("/");  

        List<BasedataResp> list1 = null;
        List<BasedataResp> list2 = null;
        QueryBasedataParam param1 = new QueryBasedataParam();
        QueryBasedataParam param2 = new QueryBasedataParam();
        param1.setCorpId(Long.valueOf(u.getCorpId()));
        param2.setCorpId(Long.valueOf(u.getCorpId()));

        String fileName = "";
        if("1".equals(type)){

            fileName = "我的客户导入模板";
            param1.setLabel("custom_status"); //客户状态
            param2.setLabel("custom_level"); //客户分级
        } else if("2".equals(type)){

            fileName = "客户关联联系人导入模板";
            param1.setLabel("contacts_role"); //角色关系
            param2.setLabel("contacts_relation"); //亲密程度
        }
        String url = path + "download\\" + fileName + ".xls";

        try {  

            if(param1.getLabel()!=null && !"".equals(param1.getLabel())){
                list1 = basedataService.selectBasedataInfo(param1); //查询系统标签
                list2 = basedataService.selectBasedataInfo(param2); //查询系统标签
                write(url, list1, list2);
            }
            ExcelExportUtil.getExcel(url, fileName, response); //下载sheet

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    /**
     *
     * @Title: write
     * @Description: 向已存在的Excel写入数据
     * @param @param file
     * @param @param list
     * @param @param list2
     * @param @return
     * @return String
     * @throws
     */
    private String write(String file, List<BasedataResp> list, List<BasedataResp> list2) {

        try {

            FileInputStream fs = new FileInputStream(file);  //获取已有的Excel
            POIFSFileSystem ps = new POIFSFileSystem(fs);  //使用POI提供的方法得到excel的信息
            HSSFWorkbook wb = new HSSFWorkbook(ps);
            HSSFSheet sheet1 = wb.getSheetAt(0);  //获取第一个工作表，一个excel可能有多个工作表
            HSSFSheet sheet2 = wb.getSheetAt(1); //获取第二个sheet
            HSSFSheet sheet3 = wb.getSheetAt(2); //获取第三个sheet

            sheet2.removeRow(sheet2.getRow(0));
            sheet3.removeRow(sheet3.getRow(0));

            FileOutputStream out = new FileOutputStream(file);  //向d://test.xls中写数据

            HSSFRow row;
　　　　　　　//向第二个sheet写入数据（第一个sheet中的下拉选项）
            for (int i = 0; i < list.size(); i++) {
                row = sheet2.createRow((short)(i)); //创建行
                row.createCell(0).setCellValue(list.get(i).getName()); //设置第一个（从0开始）单元格的数据
            }
            
　　　　　　　//向第三个sheet写入数据（第一个sheet中的下拉选项）　
            HSSFRow row2;
            for (int i = 0; i < list2.size(); i++) {
                row2 = sheet3.createRow((short)(i)); //创建行
                row2.createCell(0).setCellValue(list2.get(i).getName()); //设置第一个（从0开始）单元格的数据
            }

            out.flush();
            wb.write(out);
            out.close(); 

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

        return "success";
    }

/**
     *
     * @Title: getExcel
     * @Description: 下载指定路径的Excel文件
     * @param @param url 文件路径
     * @param @param fileName  文件名
     * @param @param response
     * @return void
     * @throws
     */
    public static void getExcel(String url, String fileName, HttpServletResponse response){

         try {  

            //1.设置文件ContentType类型，这样设置，会自动判断下载文件类型
            response.setContentType("multipart/form-data");  

            //2.设置文件头：最后一个参数是设置下载文件名
            response.setHeader("Content-Disposition", "attachment;filename="
                    + new String(fileName.getBytes("gb2312"), "ISO-8859-1") + ".xls"); //支持中文文件名

            //通过文件路径获得File对象
            File file = new File(url);  

            FileInputStream in = new FileInputStream(file);
            //3.通过response获取OutputStream对象(out)
            OutputStream out = new BufferedOutputStream(response.getOutputStream());  

            int b = 0;
            byte[] buffer = new byte[2048];
            while ((b=in.read(buffer)) != -1){
                out.write(buffer,0,b); //4.写到输出流(out)中
            }  

            in.close();
            out.flush();
            out.close();  

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    

模板截图：

二、通过Excel模板导入数据：

    /**
     *
     * @Title: impExcel
     * @Description: 批量导入客户信息
     * @param @param request
     * @param @param response
     * @param @return
     * @return String
     * @throws
     */
    @RequestMapping("impExcel")
    @ResponseBody
    public String impExcel(MultipartHttpServletRequest request,HttpServletResponse response){

        ReturnStandardDataFormat standardData = new ReturnStandardDataFormat(CustomConstants.CUSTOM_SELECT_EXCEPTION,"导入客户信息失败",null);

        MultipartFile file = request.getFile("file");
        ExcelReader er = new ExcelReader();
        int count =0;
        int error =0;
        int success = 0;

        List<Custom> list_ = new ArrayList<Custom>();
        User u = getUser(request.getSession());//SessionUtils.getUser(request.getSession());
        Long corpId = Long.valueOf(u.getCorpId());
        Date date = new Date();
        String returnMsg = "";
        int index = 1;

        try {

            List<Map<Integer,String>> list = er.readExcelContentByList(file.getInputStream()); //读取Excel数据内容
            count = list.size();

            for(Map<Integer,String> map : list){

                if(map.get(0)==null || "".equals(map.get(0))){
                    returnMsg += "第"+index+"行：【客户简称(必填)】列不能为空;";
                } else if(map.get(1)==null || "".equals(map.get(1))){
                    returnMsg += "第"+index+"行：【客户全称(必填)】列不能为空;";
                } else {
                    int num = 0;
                    QueryCustomParam params = new QueryCustomParam();
                    params.setShortName(map.get(0));
                    params.setCorpId(Long.valueOf(u.getCorpId()));
                    num = customService.checkCustom(params); //查询相同客户

                    if(num==0){
                        Custom custom = new Custom();
                        custom.setId(UUIDUtil.getLongUUID());
                        custom.setShortName(map.get(0)==null? null : map.get(0));
                        custom.setName(map.get(1)==null? null : map.get(1));
                        custom.setNumber(map.get(2)==null? null : map.get(2));
                        custom.setAddress(map.get(3)==null? null : map.get(3));
                        custom.setUrl(map.get(4)==null? null : map.get(4));
                        custom.setDescription(map.get(5)==null? null : map.get(5));
                        custom.setCustomStatusId(map.get(6)==null? null : basedataService.getLabelId("custom_status", map.get(6), corpId) );
                        custom.setCustomLevelId(map.get(7)==null? null : basedataService.getLabelId("custom_level", map.get(7), corpId) );
                        custom.setCreaterId(Long.valueOf(u.getUserId()));
                        custom.setCreateDate(date);
                        custom.setUpdaterId(Long.valueOf(u.getUserId()));
                        custom.setUpdateDate(date);
                        custom.setCorpId(Long.valueOf(u.getCorpId()));

                        list_.add(custom);

                    } else {
                        returnMsg += "第"+index+"行：【客户简称(必填)】列："+ map.get(0)+"已存在;";
                    }
                    index++;
                }
            }

            int cuccess = customService.batchInsert(list_); //批量导入客户信息

            standardData.setReturnCode(0);
            standardData.setReturnData(null);

            error = count - success;
            standardData.setReturnMessage(returnMsg);

        } catch (Exception e) {
            log.error("批量导入客户信息异常：" + e.getMessage());
            standardData.setReturnMessage(e.getMessage());
        }

        return JsonHelper.encodeObject2Json(standardData, "yyyy-MM-dd HH:mm:ss");
    }
    

读取Excel内容工具类：

/**
     * 读取Excel数据内容
     * @param InputStream
     * @return List<Map<String, String>>  Map的key是列Id(0代表第一列)，值是具体内容
     */
    public List<Map<Integer, String>> readExcelContentByList(InputStream is) {

        List<Map<Integer, String>> list = new ArrayList<Map<Integer,String>>();

        try {
            //fs = new POIFSFileSystem(is);
            wb = new HSSFWorkbook(is);
            //wb = new XSSFWorkbook(is);
        } catch (IOException e) {
            e.printStackTrace();
        }

        sheet = wb.getSheetAt(0);

        // 得到总行数
        int rowNum = sheet.getLastRowNum();
        row = sheet.getRow(0);
        int colNum = row.getPhysicalNumberOfCells();

        // 正文内容应该从第二行开始,第一行为表头的标题
        for (int i = 1; i <= rowNum; i++) {
            row = sheet.getRow(i);
            int j = 0;
            Map<Integer,String> map = new HashMap<Integer, String>();

            while (j < colNum) {
                // 每个单元格的数据内容用"-"分割开，以后需要时用String类的replace()方法还原数据
                // 也可以将每个单元格的数据设置到一个javabean的属性中，此时需要新建一个javabean
                // str += getStringCellValue(row.getCell((short) j)).trim() +
                // "-";

                map.put(j, getCellFormatValue(row.getCell((short) j)).trim().replaceAll("\t\r", ""));
                //str += getCellFormatValue(row.getCell((short) j)).trim() + "    ";
                j++;
            }
            list.add(map);
        }
        return list;
    }