Project_PlatForm/000_通用版本/006_交易统计平台/StatisticalDecision/Handler/ExcelHelper.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Web;
using NPOI.XSSF.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.POIFS.FileSystem;
using NPOI.SS.UserModel;
using System.Reflection;
using System.Text;


namespace StatisticalDecision.Handler
{

    public class ExcelHelper
    {
        private string fileName = null; //文件名
        private IWorkbook workbook = null;
        private FileStream fs = null;
        private bool disposed;

        public ExcelHelper(string fileName)
        {
            this.fileName = fileName;
            disposed = false;
        }
        public ExcelHelper()
        {

        }
        public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
        {
            ISheet sheet = null;
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                //if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                //    workbook = new XSSFWorkbook(fs);
                //else if (fileName.IndexOf(".xls") > 0) // 2003版本
                //    workbook = new HSSFWorkbook(fs);
                try
                {
                    workbook = new XSSFWorkbook(fs);
                }
                catch
                {
                    workbook = new HSSFWorkbook(fs);
                }

                if (sheetName != null)
                {
                    sheet = workbook.GetSheet(sheetName);
                    if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
                    {
                        sheet = workbook.GetSheetAt(0);
                    }
                }
                else
                {
                    sheet = workbook.GetSheetAt(0);
                }
                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数

                    if (isFirstRowColumn)
                    {
                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                        {
                            ICell cell = firstRow.GetCell(i);
                            if (cell != null)
                            {
                                string cellValue = cell.StringCellValue;
                                if (cellValue != null)
                                {
                                    DataColumn column = new DataColumn(cellValue);
                                    data.Columns.Add(column);
                                }
                            }
                        }
                        startRow = sheet.FirstRowNum + 1;
                    }
                    else
                    {
                        startRow = sheet.FirstRowNum;
                    }
                    //最后一列的标号
                    int rowCount = sheet.LastRowNum;
                    for (int i = startRow; i <= rowCount; ++i)
                    {
                        IRow row = sheet.GetRow(i);
                        if (row == null) continue; //没有数据的行默认是null　　　　　　　

                        if (row.Cells.Count > 0)
                        {
                            DataRow dataRow = data.NewRow();
                            for (int j = row.FirstCellNum; j < cellCount; ++j)
                            {
                                if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
                                    dataRow[j] = row.GetCell(j).ToString();
                            }
                            data.Rows.Add(dataRow);
                        }
                    }
                }

                return data;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }


        public void ExcelExport(string sheetName, bool isFirstRowColumn)
        {

            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook(fs);
                else if (fileName.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook(fs);

                // 写入到客户端  
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                workbook.Write(ms);


                string downloadName = "供应商商品信息导入模板.xls";
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.Buffer = true;
                HttpContext.Current.Response.Charset = "gb2312";
                HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");//设置输出流为简体中文 
                if (HttpContext.Current.Request.Browser.Browser == "IE")
                    downloadName = HttpUtility.UrlPathEncode(downloadName);
                string headerValue = string.Format("attachment; filename=\"{0}\"", downloadName);
                HttpContext.Current.Response.AddHeader("Content-Disposition", headerValue);
                HttpContext.Current.Response.ContentType = "application/octet-stream";//设置输出文件类型为excel文件。
                HttpContext.Current.Response.BinaryWrite(ms.ToArray());
                HttpContext.Current.Response.End();
                workbook = null;
                ms.Close();
                ms.Dispose();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

}