excel 导出

接口

@export_data_bp.route('/downloadPointsData', methods=['GET'])
def downloadPointsData():# 获取必要参数date_ = request.args.get('date_')ta_num = request.args.get('ta_num', type=int)# 查询点位数据data = iotdb_utils.IotdbData()if ta_num > 10:data.points = Points_Stable.points_str[ta_num - 10]else:data.points = Points_All.points_str[ta_num]data.start_time = date_data.end_time = date_utils.days_add(date_, 1)df = iotdb_utils.get_df(data)df.index = df.index.strftime('%Y-%m-%d %H:%M:%S')# 将 DataFrame 写入内存中的 Excel 文件output = io.BytesIO()with pd.ExcelWriter(output, engine='openpyxl') as writer:df.to_excel(writer, index=True, sheet_name='PointsData')output.seek(0)  # 重置指针到文件开头# 返回文件下载return send_file(output,mimetype='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',as_attachment=True,download_name=f'{ta_num}ta_points_data_{date_}.xlsx')

前端使用fetch

response.blob() 

response可以直接获取blob对象

        _handleDownload_fetch(item) {            // 使用 fetch APIfetch(`/downloadPointsData?date_=${item.date_}&ta_num=${this.ta_num}`, {method: 'GET',}).then(response => {if (!response.ok) {throw new Error('下载失败');}return response.blob(); // 获取 Blob 数据}).then(blob => {// 创建下载链接const url = window.URL.createObjectURL(blob);const a = document.createElement('a');a.href = url;a.download = `${this.ta_num}ta_points_data_${item.date_}.xlsx`;; // 设置文件名document.body.appendChild(a);a.click();// 清理window.URL.revokeObjectURL(url);document.body.removeChild(a);// alert('下载成功');this.showDownloadModal = false;}).catch(error => {console.error('下载错误:', error);alert('下载失败: ' + error.message);this.showDownloadModal = false;});},

前端使用axios

new Blob([response.data]

blob 对象要自己使用 response.data 和 response.headers['content-type'] 封装

        _handleDownload_axios(item) {            // 使用 axios APIaxios.get(`/downloadPointsData?date_=${item.date_}&ta_num=${this.ta_num}`, {responseType: 'blob', // 关键：告诉 Axios 返回 Blob 数据}).then(response => {if (response.status != 200) {throw new Error('下载失败');}// 直接从 response.data 获取 Blob 对象（无需手动转换）const blob = new Blob([response.data], {type: response.headers['content-type'] // 可选：设置 MIME 类型});return blob;}).then(blob => {// 创建下载链接const url = window.URL.createObjectURL(blob);const a = document.createElement('a');a.href = url;a.download = `${this.ta_num}ta_points_data_${item.date_}.xlsx`; // 设置文件名document.body.appendChild(a);a.click();// 清理window.URL.revokeObjectURL(url);document.body.removeChild(a);// alert('下载成功');this.showDownloadModal = false;}).catch(error => {console.error('下载错误:', error);alert('下载失败: ' + error.message);this.showDownloadModal = false;});},

前端使用接口直接下载

window.location.href

无法获取接口什么时候调用完成

window.location.href = `/downloadPointsData?date_=${item.date_}&ta_num=${this.ta_num}`;