C# 导出excel的压缩包到浏览器页面

需求背景：TCX_1710项目产品质量导出功能，客户希望每个总成导出到一个Excel表中

实现分析：客户选择时间段，点击导出按钮，默认导出开始时间当天的数据，每个总成一个Excel，将各个Excel打包压缩，返回压缩包到浏览器页面供客户下载

控制器类：

 　　　　/// <summary>
        /// 导出产品质量信息（每个总成一个Excel）
        /// </summary>
        /// <param name="keyword"></param>
        /// <returns></returns>
        public void exportExcel(string keyword)
        {
            string SNum = Request.QueryString["SNum"];
            string PSCode = Request.QueryString["PSCode"];
            string StartTime = Request.QueryString["StartTime"];
            string EndTime = Request.QueryString["EndTime"];
            //dictionary根据以上查询条件查询的数据字典
            Dictionary<string, Dictionary<string, List<PR_Product>>> dictionary = new Dictionary<string, Dictionary<string, List<PR_Product>>>();
            if (keyword == "TimeAndSnum")
            {
                dictionary = this.CreateService<IProductInfoAppServices>().GetDictionary("TimeAndSnum", SNum, PSCode, StartTime, EndTime);
            }
            else
            {
                dictionary = this.CreateService<IProductInfoAppServices>().GetDictionary("NoTimeNoSnum", SNum, PSCode, StartTime, EndTime);
            }
            //初始化需要导出字段
            List<ExportFieldInfo> fieldInfo10 = new List<ExportFieldInfo>();
            var tableInfo10 = this.CreateService<IProductInfoAppServices>().getFiledByTable();
            for (var i = 0; i < tableInfo10.Count; i++)
            {
                fieldInfo10.Add(new ExportFieldInfo()
                {
                    FieldName = tableInfo10[i].filedName,
                    DisplayName = tableInfo10[i].filedExplain,
                    DataType = DataTypeEnum.String
                });
            }
            string filePath = ConfigurationManager.AppSettings["filePath"];//配置写在E:MyProject17102_代码DoMes.WebConfigssystem.config
            //string filePath = "F:\exporfolder";
            FileStream stream = ExcelHelper<PR_Product>.ToExcel(filePath, dictionary, fieldInfo10, Response);
            Response.Flush();
            Response.End();//关闭响应
            stream.Close();//关闭zip流，否则无法删除zip文件
            //获取指定路径下所有文件夹
            //string[] folderPaths = Directory.GetDirectories(filePath);
            //获取指定路径下所有文件
            var filePaths = Directory.GetFiles(filePath);
            foreach (string filePath_2 in filePaths)
            {
                //删除所有文件
                System.IO.File.Delete(filePath_2);
            }
            //foreach (string folderPath in folderPaths)
            //{
            //    Directory.Delete(folderPath, true);
            //}
            //删除最外面的文件夹
            Directory.Delete(filePath, true);
        }

 获取数据的方法：

 　　　　/// <summary>
        /// 根据查询条件获取数据，并将数据转换为数据字典
        /// </summary>
        /// <param name="type">查询类型(暂时不用)</param>
        /// <param name="sNum">产品总成</param>
        /// <param name="pSCode">工位</param>
        /// <param name="startTime">开始时间</param>
        /// <param name="endTime">结束时间</param>
        /// <returns></returns>
        public Dictionary<string, Dictionary<string, List<PR_Product>>> GetDictionary(string type, string sNum, string pSCode, string startTime, string endTime)
        {
            //第一层key为日期(年/月/日)，value为该日所有总成的数据字典集合
            //第二层key为总成，value为该总成所有的质量数据
            Dictionary<string, Dictionary<string, List<PR_Product>>> dictionary = new Dictionary<string, Dictionary<string, List<PR_Product>>>();
            Expression<Func<PR_Product, bool>> exp = (a => 1 == 1);
            if (!string.IsNullOrEmpty(pSCode))
            {
                exp = exp.And(a => a.PSCode == pSCode);
            }
            if (!string.IsNullOrEmpty(startTime))
            {
                DateTime ctStart = Convert.ToDateTime(startTime);
                exp = exp.And(a => a.CreationTime >= ctStart);
            }
            if (!string.IsNullOrEmpty(endTime))
            {
                DateTime ctEnd = Convert.ToDateTime(endTime);
                exp = exp.And(a => a.CreationTime < ctEnd.AddDays(1));
            }
            if (!string.IsNullOrEmpty(sNum))
            {
                exp = exp.And(a => a.SNum.Contains(sNum));
            }
            //根据查询条件获得的产品质量数据
            List<PR_Product> product = this.DbContext.Query<PR_Product>().Where(exp).OrderBy(a => a.SNum).ThenBy(it => it.PSCode).ToList();
            //产品总成不为空则只有一个总成
            if (!string.IsNullOrEmpty(sNum))
            {
                Dictionary<string, List<PR_Product>> dictionary2 = new Dictionary<string, List<PR_Product>>();
                dictionary2.Add(sNum, product);
                dictionary.Add(startTime, dictionary2);
            }
            else//产品总成为空
            {
                Dictionary<string, List<PR_Product>> dictionary2 = new Dictionary<string, List<PR_Product>>();
                //从查询的数据集合中查询出所有的总成
                List<PR_Product> snumDistinct = product.Where((x, firstId) => product.FindIndex(z => z.SNum == x.SNum) == firstId).ToList();
                foreach(PR_Product item in snumDistinct)
                {
                    //从大数据集合中查找该总成的数据集合
                    List<PR_Product> snumList = product.Where(x => x.SNum == item.SNum).ToList();
                    dictionary2.Add(item.SNum, snumList);
                }
                dictionary.Add(startTime, dictionary2);
            }
            return dictionary;
        }

Excel文件帮助类方法：

  　　　　/// <summary>
        /// 导出产品质量数据，每个总成一个Excel
        /// </summary>
        /// <param name="filePath">导出文件路径</param>
        /// <param name="dictionary">导出数据字典</param>
        /// <param name="fieldInfies">导出数据表头</param>
        /// <param name="Response">页面响应</param>
        /// <returns></returns>
        public static FileStream ToExcel(String filePath, Dictionary<string, Dictionary<string, List<T>>> dictionary, List<ExportFieldInfo> fieldInfies, HttpResponseBase Response)
        {
            //导出文件路径（这里也可以写成固定路径"F:\exporfolder"）
            //String filePath = "F:\exporfolder";
            //创建此路径（配置文件中的地址一定要保证磁盘存在）
            Directory.CreateDirectory(filePath);
            //导出压缩文件的全路径(zipFilePath)
            DateTime dateTimeZip = DateTime.Now;
            string zipFilePath = filePath + Path.DirectorySeparatorChar + "QM_" + dateTimeZip.ToString("yyyyMMdd") + "_" + dateTimeZip.ToString("HHmmss") + "_" + dateTimeZip.ToString("fff") + ".zip";
            //导出Excel文件路径
            string fullFilePath = "";
            //保存Excel文件名
            string fileName = "";
            //用于存放生成的Excel文件名称集合
            List<string> fileNames = new List<string>();
            //excel文件流
            FileStream excel = null;
            foreach (Dictionary<string, List<T>> items in dictionary.Values)
            {
                foreach (var item in items)
                {
                    DateTime dateTimeExcel = DateTime.Now;
                    //Excel文件名
                    fileName = item.Key + "_" + dateTimeExcel.ToString("yyyyMMdd") + "_" + dateTimeExcel.ToString("HHmmss") + "_" + dateTimeExcel.ToString("fff") + ".xlsx";
                    //Excel文件路径
                    fullFilePath = filePath + Path.DirectorySeparatorChar + fileName;
                    //存放到Excel文件名称集合
                    fileNames.Add(fullFilePath);
                    excel = File.Create(fullFilePath);
                    HSSFWorkbook book = createColumnHSSF(item.Key, item.Value, fieldInfies);
                    // 写文件
                    book.Write(excel);
                    excel.Close();
                }
            }
            FileStream stream = ZipFiles(fileNames, zipFilePath, Response);
            return stream;
        }

 　　　　/// <summary>
        /// 压缩多个文件
        /// </summary>
        /// <param name="filesToZip">要进行压缩的文件名集合</param>
        /// <param name="zipedFile">压缩后生成的压缩文件名</param>
        public static FileStream ZipFiles(List<string> filesToZip, string zipedFile, HttpResponseBase Response)
        {
            Response.AddHeader("content-disposition", "attachment;filename=" + zipedFile.Substring(zipedFile.LastIndexOf("\", StringComparison.Ordinal) + 1) );
            //Zip文件流
            FileStream zipFile = File.Create(zipedFile);
            //将zipStream写到响应输出流中
            ZipOutputStream zipStream = new ZipOutputStream(Response.OutputStream);
            //遍历所有的Excel文件
            foreach (string fileToZip in filesToZip)
            {
                if (string.IsNullOrEmpty(fileToZip))
                {
                    throw new ArgumentException(fileToZip);
                }
                if (string.IsNullOrEmpty(zipedFile))
                {
                    throw new ArgumentException(zipedFile);
                }
                if (!File.Exists(fileToZip))
                {
                    throw new FileNotFoundException("指定要压缩的文件: " + fileToZip + " 不存在!");
                }
                try
                {
                    //读取Excel文件到文件流中
                    using (var fs = File.OpenRead(fileToZip))
                    {
                        var buffer = new byte[fs.Length];
                        fs.Read(buffer, 0, buffer.Length);
                        fs.Close();
                        //从Excel文件路径中读取Excel文件名
                        var fileName = fileToZip.Substring(fileToZip.LastIndexOf("\", StringComparison.Ordinal) + 1);
                        //根据文件名创建ZipEntry
                        var zipEntry = new ZipEntry(fileName);
                        //将ZipEntry放入zipStream流中
                        zipStream.PutNextEntry(zipEntry);
                        zipStream.SetLevel(5);
                        zipStream.Write(buffer, 0, buffer.Length);
                    }            
                }
                catch (IOException ioex)
                {
                    throw new IOException(ioex.Message);
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
            }
            //zipStream完成后返回
            zipStream.Finish();
            return zipFile;
        }