引入依赖

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.1.0</version>
</dependency>

上传

文件上传入参为

@RequestPart MultipartFile file

具体实现：

   // 1.获取上传文件输入流
        try (InputStream inputStream = multipartFile.getInputStream()) {
            // 调用用 hutool 方法读取数据 默认调用第一个sheet
            ExcelReader excelReader = ExcelUtil.getReader(inputStream);
            //忽略第一行头(第一行是中文的情况),直接读取表的内容
            List<List<Object>> list = excelReader.read(1);
            List<WorkPosition> workPositionList=new ArrayList<>();
            if(CollectionUtil.isEmpty(list)){
                return WebResponse.error(WebResponse.WARN_ERROE,"上传文件数据为空，请重新上传");
            } else {
                for (List<Object> row : list) {
                    、、、、逻辑处理、、、、
                }
                //批量插入数据
                Integer count=workPositionMapper.insertList(workPositionList);
                if(count>0){
                    return WebResponse.success("批量导入成功");
                }else{
                    return WebResponse.error(WebResponse.CODE_ERROE,"数据导入失败");
                }
            }
        } catch (Exception e) {
            throw new RuntimeException("批量导入货位出错：" + e.getMessage());
        }
    }

下载

下载模板，（下载文件在项目中）

public void getWorkPositionExcelCase(HttpServletResponse response) throws IOException {
        //获取文件所在位置
        String path="file/";
        String fileName="导入货位模板.xls";
        // 清空输出流
        String resultFileName = fileName;
        resultFileName = URLEncoder.encode(resultFileName,"UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + resultFileName);// 设定输出文件头
        response.setContentType("application/msexcel");// 定义输出类型
        //输入流：文件路径
        DataInputStream in = new DataInputStream(new ClassPathResource(path+fileName).getInputStream());
        //输出流
        OutputStream out = response.getOutputStream();
        //输出文件
        int bytes = 0;
        byte[] bufferOut = new byte[1024];
        while ((bytes = in.read(bufferOut)) != -1) {
            out.write(bufferOut, 0, bytes);
        }
        out.close();
        in.close();
    }

下载文件，（hutool，代码生成文件形式）

public void getAllHandleExcel(GetWorkAoCodeVo getWorkAoCodeVo, HttpServletResponse response) {
        ExcelWriter writer = ExcelUtil.getWriter();
        List<WorkAoHandleVo> workAoHandleVos =workAoHandleMapper.getAllHandle(getWorkAoCodeVo);
        List<Map<String, Object>> rows = workAoHandleVos.stream().map(item -> {
            Map<String, Object> maps = new HashMap<>();
            String format = DateUtil.format(item.getCreateTime(), DatePattern.NORM_DATETIME_PATTERN);
            maps.put("createTime", format);
            maps.put("stationName", item.getStationName());
            maps.put("shelvesName", item.getShelvesName());
            maps.put("positionCode", item.getPositionCode());
            maps.put("aoNo", item.getAoNo());
            String handleName="";
            if(WorkConstant.LOW_FRAME.equals(item.getHandle())){
                handleName="下架";
            }else if(WorkConstant.UP_FRAME.equals(item.getHandle())){
                handleName="上架";
            }else{
                handleName="补货";
            }
            maps.put("handle", handleName);
            return maps;
        }).collect(Collectors.toList());

        //设置整体标题
        //标题占用表格长度
        int columns = 6;
        writer.merge(columns - 1, "AO上下架记录");

        //各个字段标题
        writer.addHeaderAlias("createTime", "时间");
        writer.addHeaderAlias("stationName", "工位缓存区");
        writer.addHeaderAlias("shelvesName", "所属货架");
        writer.addHeaderAlias("positionCode", "货位码");
        writer.addHeaderAlias("aoNo", "AO|架次号");
        writer.addHeaderAlias("handle", "操作内容");

        //设置各个
        writer.setColumnWidth(0, 30);
        writer.setColumnWidth(1, 30);
        writer.setColumnWidth(2, 30);
        writer.setColumnWidth(3, 30);
        writer.setColumnWidth(4, 30);
        writer.setColumnWidth(5, 30);
        writer.write(rows, true);

        response.setContentType("application/vnd.ms-excel;charset=utf-8");
        try {
            response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode("AO上下架记录-" + DateUtil.today() + ".csv", "utf-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        ServletOutputStream out = null;
        try {
            out = response.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        writer.flush(out, true);
        writer.close();
        IoUtil.close(out);
    }