关于java的Excel导入导出之easypoi

1. 导入easypoi相关jar包,这里的easypoi-base的包也可以不倒入，因为easypoi-web中有依赖easypoi-base会自动导入的

    <!-- https://mvnrepository.com/artifact/cn.afterturn/easypoi-base -->
    <dependency>
        <groupId>cn.afterturn</groupId>
        <artifactId>easypoi-base</artifactId>
        <version>4.2.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/cn.afterturn/easypoi-annotation -->
    <dependency>
        <groupId>cn.afterturn</groupId>
        <artifactId>easypoi-annotation</artifactId>
        <version>4.2.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/cn.afterturn/easypoi-web -->
    <dependency>
        <groupId>cn.afterturn</groupId>
        <artifactId>easypoi-web</artifactId>
        <version>4.2.0</version>
    </dependency>
   

2. 编写导出使用的Javabean，根据具体的需求来定。

    //导出实体类的唯一标识
    @ExcelTarget("EcCommodityManagementExport")
    //提供get、set
    @Data
    //实现序列化
    public class EcCommodityManagementExportVo implements Serializable {
     private static final long serialVersionUID = 42L;
   
    /**
    * 图片  ，此处做的第一列与第二列的列名合并(只是列名合并)，因为合并之后是第一列的值作为新值填充所以与第二列		* 的name一样
    * name 导出时的列名名称
    * type 导出类型 1 是文本 2 是图片,3 是函数,10 是数字 默认是文本
    * imageType 导出类型 1 从file读取 2 是从数据库中读取 默认是文件 同样导入也是一样的
    * numFormat 数字格式化,参数是Pattern,使用的对象是DecimalFormat
    * replace 值得替换  导出是{a_id,b_id} 导入反过来,所以只用写一个
    * databaseFormat 导出时间设置,如果字段是Date类型则不需要设置 数据库如果是string 类型,这个需要设置这个数			* 据库格式
     */
     @Excel(name = "商品名称（规格描述、单位）" , type = 2 , imageType = 1 , height = 54 , width = 25)
     private String picUrl;
   
     /**
     * 商品名称
      */
      @Excel(name = "商品名称（规格描述、单位）" , height = 54 , width = 25)
      private String productName;
   
     /**
     * 商品编码
      */
      @Excel(name = "商品编码" , height = 54 , width = 25)
      private String productCode;
   
      /**
      * 原价
      */
      @Excel(name = "原价" , height = 54 , width = 25 , numFormat = "0.00")
      private BigDecimal primeCost;
   
     /**
     * 售价
     */
     @Excel(name = "售价" , height = 54 , width = 25 , numFormat = "0.00")
     private BigDecimal price;
   
    	/**
     * 库存
      */
      @Excel(name = "库存" , height = 54 , width = 25)
     private int repertory;
   
      /**
     * 商品状态(0未提交1已提交2已上架3已下架)
      */
     @Excel(name = "商品状态" , height = 54 , width = 25 , replace = {"未提交_0","已提交_1","已上架_2","已下架_3"})
     private int productStatus;
   
     /**
     * 上架时间
      */
      @Excel(name = "上架时间" , height = 54 , width = 25 , databaseFormat = "yyyy-MM-dd HH:mm:ss" , format = "yyyy-MM-dd HH:mm:ss")
     private String addedTime;
   
     /**
     * 审核状态(0--1未审核2审核成功3审核失败)
     */
     @Excel(name = "审核状态" , height = 54 , width = 25 , replace = {"--_0","未审核_1","审核成功_2","审核失败_3"})
     private int auditStatus;
   
     /**
     * 审核人姓名
      */
      @Excel(name = "审核人姓名" , height = 54 , width = 25)
     private String auditUserName;
   
     /**
     * 创建人姓名
     */
     @Excel(name = "创建人姓名" , height = 54 , width = 25)
     private String createUserName;
   
     /**
     * 创建时间
     */
     @Excel(name = "创建时间" , height = 54 , width = 25 , databaseFormat = "yyyy-MM-dd HH:mm:ss" , format = "yyyy-MM-dd HH:mm:ss")
     private Date createTime;
   
    }
   

3. 编写导出控制层代码

    @ApiOperation(value = "导出" , notes = "导出")
    @GetMapping("exportProduct")
    public void exportProduct(@RequestParam("productIdList") List<String> productIdList, HttpServletRequest request, HttpServletResponse response) throws Exception{
    ecCommodityManagementService.exportProduct(productIdList,request,response);
     }
   

4. 编写导出业务层代码

    /**
     * 导出
     * @param productIdList
     * @param request
     * @param response
     */
    @Override
    public void exportProduct(List<String> productIdList, HttpServletRequest request, HttpServletResponse response) throws Exception{
    //如果勾选商品则查询勾选的数据，如没有勾选则查所有商品数据
    List<EcCommodityManagementExportVo> ecCommodityManagementList = ecCommodityManagementMapper.findExportData(productIdList);
    if (ecCommodityManagementList != null && ecCommodityManagementList.size() > 0){
        //封装图片数据
        for (EcCommodityManagementExportVo ecCommodityManagementExportVo : ecCommodityManagementList) {
    	//导出图片时如果是链接形式要填写全路径
            ecCommodityManagementExportVo.setPicUrl(fileUrl + ecCommodityManagementExportVo.getPicUrl());
        }
    }
    //设置导出文件表头及sheet名
    ExportParams exportParams = new ExportParams("商品列表", "商品列表");
    //设置导出类型为Excel
    exportParams.setType(ExcelType.XSSF);
    //创建数据导出对象
    Workbook workbook = ExcelExportUtil.exportExcel(exportParams, EcCommodityManagementExportVo.class, ecCommodityManagementList);
    //合并单元格new CellRangeAddress(从第几行开始, 到第几行结束, 从第几列开始, 到第几列结束)
    CellRangeAddress cellAddresses = new CellRangeAddress(1, 1, 0, 1);
    workbook.getSheetAt(0).addMergedRegion(cellAddresses);
    //创建导出文件名
    String fileName = "商品列表.xlsx";
    if (workbook != null){
        //让浏览器看的懂我们要干啥
        response.setCharacterEncoding("UTF-8");
        response.setHeader("content-Type","application/vnd.ms-excel");
        response.setHeader("Content-Disposition","attachment;filename=" + URLEncoder.encode(fileName,"UTF-8"));
        workbook.write(response.getOutputStream());
    }
    }
   

   注：持久层代码就不贴了

5. 编写导入使用的Javabean，根据具体的需求来定。

    //导入实体类的唯一标识
    @ExcelTarget("uploadExcel")
    //提供get、set
    @Data
    //实现序列化
    public class UploadExcelVo implements Serializable {
    //name 对应导入的Excel中的列名，必须一致！
    @Excel(name = "题目")
    private String topic;
   
    @Excel(name = "选项A")
    private String optionA;
   
    @Excel(name = "选项B")
    private String optionB;
   
    @Excel(name = "选项C")
    private String optionC;
   
    @Excel(name = "选项D")
    private String optionD;
   
    @Excel(name = "正确答案(多个答案逗号隔开且必须大写)")
    private String rightAnswers;
   
    }
   

6. 编写导入控制层代码

    @ApiOperation(value = "题目模板导入" , notes = "题目模板导入")
    @PostMapping("uploadExcel")
    @ResponseBody
    public ResultBody uploadExcel(HttpServletRequest request,MultipartFile file){
    	return sybQuestionBankService.uploadExcel(request,file);
    }
   

7. 编写导入业务层代码
   
   `

    /**
    * 题目模板导入
    * @param file
    * @return
    */
    @Override
    public ResultBody uploadExcel(HttpServletRequest request,MultipartFile file) {
    //导入数据总条数
    int totalNum = 0;
    //导入成功条数
    int cg = 0;
    try {
        String bankId = request.getParameter("bankId");
        //创建数据导入规则对象
        ImportParams importParams = new ImportParams();
        //设置第一行为表头不读取
        importParams.setHeadRows(1);
        //验证Excel
        importParams.setNeedVerify(true);
        //工具类进行读取直接封装返回值类型UploadExcelVo
        ExcelImportResult<UploadExcelVo> objectExcelImportResult = ExcelImportUtil.importExcelMore(file.getInputStream(), UploadExcelVo.class, importParams);
        //遍历读取到的数据
        if (objectExcelImportResult.getList() != null && objectExcelImportResult.getList().size() > 0){
            totalNum = objectExcelImportResult.getList().size();
            SybQuestionBankDetail byQuestionBankIdLimitOne = sybQuestionBankDetailDao.findByQuestionBankIdLimitOne(bankId);
            int detailSort = 0;
            if (byQuestionBankIdLimitOne != null && !byQuestionBankIdLimitOne.equals("")){
                detailSort = byQuestionBankIdLimitOne.getDetailSort()+1;
            }else {
                detailSort = 1;
            }
            for (UploadExcelVo uploadExcelVo : objectExcelImportResult.getList()) {
                //创建题目对象进行存储数据
                SybQuestionBankDetail sybQuestionBankDetail = new SybQuestionBankDetail();
                sybQuestionBankDetail.setId(UUIDGenerator.getUUID());
                sybQuestionBankDetail.setIsDelete(0);
                sybQuestionBankDetail.setTopic(uploadExcelVo.getTopic());
                sybQuestionBankDetail.setQuestionBankId(bankId);
                sybQuestionBankDetail.setDetailSort(detailSort);
                sybQuestionBankDetail.setCreateTime(new Date());
                //封装题目选项
                List<Map<String,Object>> options = new ArrayList<>();
                Map<String,Object> mapA = new HashMap<>();
                mapA.put("optionKey","A");
                mapA.put("optionValue",uploadExcelVo.getOptionA());
                options.add(mapA);
                Map<String,Object> mapB = new HashMap<>();
                mapB.put("optionKey","B");
                mapB.put("optionValue",uploadExcelVo.getOptionB());
                options.add(mapB);
                if (uploadExcelVo.getOptionC() != null && !uploadExcelVo.getOptionC().equals("")){
                    Map<String,Object> mapC = new HashMap<>();
                    mapC.put("optionKey","C");
                    mapC.put("optionValue",uploadExcelVo.getOptionC());
                    options.add(mapC);
                }
                if (uploadExcelVo.getOptionD() != null && !uploadExcelVo.getOptionD().equals("")){
                    Map<String,Object> mapD = new HashMap<>();
                    mapD.put("optionKey","D");
                    mapD.put("optionValue",uploadExcelVo.getOptionD());
                    options.add(mapD);
                }
                sybQuestionBankDetail.setOptions(JSON.toJSONString(options));
                //封装正确答案
                String[] split = uploadExcelVo.getRightAnswers().split(",", -1);
                sybQuestionBankDetail.setRightAnswers(JSON.toJSONString(split));
                int insert = sybQuestionBankDetailDao.insert(sybQuestionBankDetail);
                if (insert > 0){
                    detailSort++;
                    cg++;
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return ResultBody.ok().data("应导入"+totalNum+"条题目，导入成功"+cg+"条");
    }
   

   注：持久层代码就不贴了
   
   以上就是easypoi的导入导出的使用。