Java利用EasyExcel实现导出导入功能的示例代码

//导出导入类使用注解
@ExcelProperty("表头对应的中文列名")
private String data;

public void exportTemplate(HttpServletResponse response, HttpServletRequest request) throws UnsupportedEncodingException {
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    String fileName="数据模板";
    fileName = URLEncoder.encode(fileName, "UTF-8");
    fileName = new String(fileName.getBytes("utf-8"),"ISO-8859-1");
    String filePath = new ClassPathResource("docs/other/".concat(fileName).concat(dateFormat.format(new Date())).concat(".xlsx")).getPath();
    //导出模板表头
    List<String> headers = Arrays.asList("列名");
    List list = new ArrayList();
    PoiUtil.exportTemplateData(filePath,headers,list);
    //获取文件流返回给客户端
    DownloadFileUtil.downloadFile(response, request, filePath);
}

//构造模板基础数据,比如下拉列表及其校验规则
public static void exportTemplateData(String filePath, List<String> headers, List list) {
        //证件类型 下拉
        List<String> certificationTypeAttributeList = new ArrayList<String>();
        certificationTypeAttributeList.add("身份证");
        certificationTypeAttributeList.add("户口簿");
        certificationTypeAttributeList.add("护照");
        certificationTypeAttributeList.add("其他");
        // 2.创建Excel
        // 1)创建workbook
        HSSFWorkbook hssfWorkBook = new HSSFWorkbook();
        // 2)创建sheet
        HSSFSheet mainSheet = hssfWorkBook.createSheet(MAIN_SHEET);// 主sheet
        // 用于展示
        //2.1 创建表头，供用户输入
        initHeaders(hssfWorkBook, mainSheet, headers);
        //导出数据到主sheet
        setMainSheet(mainSheet, list);
        // attribute 下拉框 sheet
        HSSFSheet certificationTypeAttributeSheet= hssfWorkBook.createSheet(CERTIFICATIONTYPE_ATTRIBUTE_STATUS);
 hssfWorkBook.setSheetHidden(hssfWorkBook.getSheetIndex(certificationTypeAttributeSheet), true);// 设置sheet是否隐藏

        // 3.写入数据
    writeData(hssfWorkBook, mapSheet, mapOneList, map);
        //证件类型位
        writeDropDownData(hssfWorkBook, certificationTypeAttributeSheet, certificationTypeAttributeList, CERTIFICATIONTYPE_ATTRIBUTE_STATUS);

        // 4.设置数据有效性
        setDataValid(hssfWorkBook, mainSheet,"boundaryMarking");
        FileOutputStream os = null;
        try {
            String exisname = filePath.substring(0, filePath.lastIndexOf("/"));
            File f = new File(exisname);
            if (!f.exists()) {
                f.mkdirs();//创建目录
            }
            // 创建可写入的Excel工作簿
            File file = new File(filePath);
            if (!file.exists()) {
                boolean bool = file.createNewFile();
                System.out.println(bool);
            } else {
                file.delete();
                file.createNewFile();
            }
            os = new FileOutputStream(filePath);
            hssfWorkBook.write(os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(os);
        }
    }

public static void downloadFile(HttpServletResponse response, HttpServletRequest request, String filePath) {
    try {
        //获取文件
        File file = new File(filePath);
        String fileName = file.getName();
        response.reset();
        ServletOutputStream out = response.getOutputStream();
        request.setCharacterEncoding("UTF-8");
        int BUFFER = 1024 * 10;
        byte data[] = new byte[BUFFER];
        BufferedInputStream bis = null;
        //获取文件输入流
        InputStream inputStream = new BufferedInputStream(new FileInputStream(filePath));
        // 以流的形式下载文件。
        DataInputStream fis = new DataInputStream(inputStream);
        int read;
        bis = new BufferedInputStream(fis, BUFFER);
        response.setContentType("application/OCTET-STREAM");
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        while ((read = bis.read(data)) != -1) {
            out.write(data, 0, read);
        }
        fis.close();
        bis.close();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        File file = new File(filePath);
        //删除临时文件
        if (file.exists()) {
            file.delete();
        }
    }
}

//从前端接收传过来的文件
InputStream inputStream = file.getInputStream();
List<DataModel> list = EasyExcel.read(inputStream).head(DataModel.class).sheet().doReadSync();
//对解析到数据进行逻辑操作......