easypoi导出文件

easypoi导出文件

easypoi教程网址：http://easypoi.mydoc.io/，里面的例子很生动形象，形容的恰到好处。

一、创建导出文件的实体类

我用到的有两种方法，一种是直接新建一个class，class里面写的属性加上@Excel()注解，代表导出表中的一列，在注解中可以设置列名列宽等属性；另一种是动态创建导出文件的实体类，用ExcelExportEntity类去创建列，eg:new ExcelExportEntity(“组织机构”,“organization”, 24)，具体使用方式，看手册即可

二、获取列的值

值可以用HashMap用key，value的形式存放，key就是在创建列时的取得key，比如上面的new ExcelExportEntity(“组织机构”, “organization”,24)中的key就是organization，在值的map中key就是organization，value就是放这个organization的值；

在创建列时，可以指定这一列的宽度上面中的例子指定的宽度是24，也可以在创建完workbook对象后，通过sheet设置自动宽度

Sheet sheet = workbook.getSheetAt(workbook.getActiveSheetIndex());
        for (int i = 0; i < 68; i++)
            sheet.autoSizeColumn(i);

三、创建workbook对象

参数需要三个，①exportParams是导出的参数设置，②entity位置是实体类的class对象，或者动态创建的导出类，③是表格中的值

ExportParams exportParams = new ExportParams();
exportParams.setType(ExcelType.XSSF);
exportParams.setSheetName("重点指标");
Workbook workbook = ExcelExportUtil.exportExcel(exportParams, entity, entityValue);
// 如果上面已经指定了列宽，这里在设置自动适应宽度，上面设置的列宽会失效（根据实际情况自己决定使用哪种方式）
Sheet sheet = workbook.getSheetAt(workbook.getActiveSheetIndex());
        for (int i = 0; i < 68; i++)
            sheet.autoSizeColumn(i);

文件流写入响应体中

	response.reset();
	response.setCharacterEncoding("ISO8859-1");
	response.setHeader("Connection", "close");
	response.setHeader("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
	String fileName2 = "".concat(new String("文件名".getBytes("gb2312"), "ISO8859-1")).concat(".xlsx");
	response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
	response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName2, "UTF-8"));
	
	workbook.write(response.getOutputStream());
	response.getOutputStream().flush();
	response.getOutputStream().close();
	response.flushBuffer();

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H₂O is是液体。

2¹⁰ 运算结果是 1024.

下面是全部的代码

String taskId = params.get("taskId").toString();
        List<Map<String,Object>> propertyModels = (ArrayList<Map<String,Object>>) params.get("propertyModels");

        List<Map<String,String>> organizationList = performanceTaskRepository.findOrganizationIdByTaskId(taskId);
        Map<String, Map<String,Object>> organizationKPI = new HashMap<>();
        for (Map<String, String> organization : organizationList) {
            Map<String, Object> result = new HashMap<>();
            result.put("organization",organization.get("organization_name"));
            organizationKPI.put(organization.get("organization_id"), result);
        }

        List<String> propertyModelIdList = new ArrayList<>();
        for (Map<String, Object> propertyModel : propertyModels) {
            String nodeKey = propertyModel.get("nodeKey").toString();
            String propertyUniqueName = propertyModel.get("propertyUniqueName").toString();
            String itemRowKey = propertyModel.get("itemRowKey").toString();
            String propertyModelId = propertyModel.get("id").toString();
            propertyModelIdList.add(propertyModelId);
            List<ItemProperty> properties = itemPropertyDao.findByTaskIdAndItemIdAndNodeKeyAndPropertyUniqueName(
                taskId, nodeKey, propertyUniqueName, itemRowKey);
            properties.forEach(property -> {
                Map<String,Object> map = organizationKPI.get(property.getOrganizationId());
                map.put(property.getPropertyUniqueName(), property.getResultValue());
                organizationKPI.put(property.getOrganizationId(), map);
            });
        }

        List<ExcelExportEntity> entity = new ArrayList<>();
        entity.add(new ExcelExportEntity("组织机构","organization", 24));
        List<ItemPropertiesModel> itemPropertiesModelList = itemPropertiesModelDao.findByPropertyModelIdIn(propertyModelIdList);
        itemPropertiesModelList.forEach(itemPropertiesModel -> {
            ExcelExportEntity excelEntity = new ExcelExportEntity(itemPropertiesModel.getPropertyViewName(), itemPropertiesModel.getPropertyUniqueName());
            excelEntity.setWidth(26);
            entity.add(excelEntity);
        });

        List<Map<String, Object>> entityValue = new ArrayList<>();
        for (Map.Entry<String, Map<String, Object>> entry : organizationKPI.entrySet()) {
            entityValue.add(entry.getValue());
        }

        ExportParams exportParams = new ExportParams();
        exportParams.setType(ExcelType.XSSF);
        exportParams.setSheetName("重点指标");
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, entity, entityValue);

        try {
            response.reset();
            response.setCharacterEncoding("ISO8859-1");
            response.setHeader("Connection", "close");
            response.setHeader("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            String fileName2 = "".concat(new String("重点指标".getBytes("gb2312"), "ISO8859-1")).concat(".xlsx");
            response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName2, "UTF-8"));

            workbook.write(response.getOutputStream());
            response.getOutputStream().flush();
            response.getOutputStream().close();
            response.flushBuffer();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

前端代码

vue前端获取转换下载方式

exportKPI({ taskId: this.$store.state.currentTaskId, propertyModels: propertyArr }).then(res => {
        const blobUrl = window.URL.createObjectURL(res.data)
        const elink = document.createElement('elink')
        elink.style.display = 'none'
        elink.download = name
        elink.href = blobUrl
        elink.click()
        window.URL.revokeObjectURL(blobUrl)
        document.body.removeChild(elink)
        const h = this.$createElement
        this.$message({
          message: h('p', null, [
            h('span', null, '重要指标文件导出 '),
            h('i', { style: 'color: teal' }, '成功')
          ])
        })
        this.kpiLoading = false
        this.dialogExportKPIVisible = false
        this.KPIData = []
      }).catch(err => {
        console.error(err)
        const h = this.$createElement
        this.$message({
          message: h('p', null, [
            h('span', null, '重要指标文件导出 '),
            h('i', { style: 'color: red' }, '失败')
          ])
        })
      }).finally(() => {
        this.kpiLoading = false
      })