导入，导出excel

/// <summary>
        /// 导出数据
        /// </summary>
        /// <param name="XMMC"></param>
        /// <param name="GZNR"></param>
        /// <param name="STATUS"></param>
        /// <param name="XMJXZT"></param>
        /// <param name="ZXR"></param>
        /// <param name="FQR"></param>
        [HttpPost]
        public void ReportWorkData(string XMMC, string HTBH, string KHMC, string FHZT)
        {
            //模板文件
            string TempletFileName = Server.MapPath("/Template/XX的模板.xls");
            string ReportFileName = Server.MapPath("/ExeclFile/XX.xls");
            //导出文件
            FileStream file = new FileStream(TempletFileName, FileMode.Open, FileAccess.Read);
            //将文件流中模板加载到工作簿对象中
            HSSFWorkbook hssfworkbook = new HSSFWorkbook(file);
            //建立一个名为Sheet1的工作表
            ISheet ws = (ISheet)hssfworkbook.GetSheet("表名");//添加或修改WorkSheet里的数据
            List<TEntity> list = contractapp.GetSqlReportList();//获取list
            if (list.Count > 0)
            {
                for (int n = 0; n < list.Count; n++)
                {
                    IRow r = ws.CreateRow(2 + n);
                    r.CreateCell(0).SetCellValue(n + 1);
                    r.CreateCell(1).SetCellValue(list[n].列头1);
                    r.CreateCell(2).SetCellValue(list[n].列头2);
                    r.CreateCell(3).SetCellValue(list[n].列头3);
                    r.CreateCell(4).SetCellValue(list[n].列头4);
                    r.CreateCell(5).SetCellValue(list[n].列头5);
                    r.CreateCell(6).SetCellValue(list[n].列头6);
                    r.CreateCell(7).SetCellValue(list[n].列头7);
                    r.CreateCell(8).SetCellValue(list[n].列头8);
                    r.CreateCell(9).SetCellValue(list[n].列头9);
                    r.CreateCell(10).SetCellValue(list[n].列头10);
                    r.CreateCell(11).SetCellValue(list[n].列头11);
                    r.CreateCell(12).SetCellValue(list[n].列头12);

                }
            }

            ws.ForceFormulaRecalculation = true;

            using (FileStream filess = System.IO.File.OpenWrite(ReportFileName))
            {
                hssfworkbook.Write(filess);
            }
            System.IO.FileInfo filet = new System.IO.FileInfo(ReportFileName);
            Response.Clear();
            Response.Charset = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.UTF8;
            // 添加头信息，为"文件下载/另存为"对话框指定默认文件名
            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("XX.xls"));
            // 添加头信息，指定文件大小，让浏览器能够显示下载进度
            Response.AddHeader("Content-Length", filet.Length.ToString());
            // 指定返回的是一个不能被客户端读取的流，必须被下载
            Response.ContentType = "application/ms-excel";
            //把文件流发送到客户端
            Response.WriteFile(filet.FullName);
            // 停止页面的执行
            Response.End();
        }

导入

存入模板

function uploaderXK() {
        var uploader = new plupload.Uploader({
            runtimes: 'html5,flash,silverlight,html4',
            browse_button: 'uploadFileXK',
            url: "/SystemManage/Contract/UpLoad?type=1",
            chunk_size: '10mb',
            filters: {
                max_file_size: '10mb',
                mime_types: [
                    { title: "text files", extensions: "xls,xlsx" }
                ]
            },
            init: {
                FileUploaded: function (up, file, info) {

                    $.modalMsg("正在生成!", "success");
                    var ret = $.parseJSON(info.response);
                    console.log(ret);
                    if (ret.msg != "" && ret.msg != undefined) {
                        $.modalMsg(ret.msg, "error");
                    }
                    if (ret.tab0.length > 0) {
                        var tr = '';
                        for (var i = 0; i < ret.tab0.length; i++) {
                            var CPGG1 = ret.tab0[i].列头1; if (CPGG1 == undefined || CPGG1 == null) { CPGG1 = ""; }
                            var CPGG2 = ret.tab0[i].列头2; if (CPGG2 == undefined || CPGG2 == null) { CPGG2 = ""; }
var CPGG3 = ret.tab0[i].列头3; if (CPGG3 == undefined || CPGG3 == null) { CPGG3 = ""; }
var CPGG4 = ret.tab0[i].列头4; if (CPGG4 == undefined || CPGG4 == null) { CPGG4 = ""; }
var CPGG5 = ret.tab0[i].列头5; if (CPGG5 == undefined || CPGG5 == null) { CPGG5 = ""; }
var CPGG6 = ret.tab0[i].列头6; if (CPGG6 == undefined || CPGG6 == null) { CPGG6 = ""; }
var CPGG7 = ret.tab0[i].列头7; if (CPGG7 == undefined || CPGG7 == null) { CPGG7 = ""; }
                            //模板与此处列头名称一致

                            tr += '<tr>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG1 + '" /></td>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG2 + '" /></td>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG3 + '" /></td>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG4 + '" /></td>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG5 + '" /></td>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG6 + '" /></td>\
                                        <td><input type="text" class="form-control" style="border:0px" placeholder="" value="' + CPGG7 + '" /></td>\
                                        <td><a class="sc" onclick="lxrsc(this)"><i class="fa fa-trash-o"></i></a></td>\
                                    </tr>';
                        }
                        $("#table").append(tr);//添加显示在table
                    }
                },
                PostInit: function () { },
                FilesAdded: function (up, files) {
                    $('#loading').modal('show');
                    plupload.each(files, function (file) { });
                    uploader.start();
                },
                UploadProgress: function (up, file) { },
                Error: function (up, err) {
                    $('#loading').modal('hide');
                    $.modalMsg("文件仅支持（xls,xlsx）且不超过10M!", "error");
                },
                UploadComplete: function (up, data) { },
                UploadSuccess: function (file, data, response) { }
            }
        });
        uploader.init();
    }

using System.IO;
using NPOI;
using NPOI.SS.UserModel;

private void btn_NPOI_Click(object sender, EventArgs e)
{
string importExcelPath = "E:\\import.xlsx";
string exportExcelPath = "E:\\export.xlsx";
IWorkbook workbook = WorkbookFactory.Create(importExcelPath);
ISheet sheet = workbook.GetSheetAt(0);//获取第一个工作薄
IRow row = (IRow)sheet.GetRow(0);//获取第一行

//设置第一行第一列值,更多方法请参考源官方Demo
row.CreateCell(0).SetCellValue("test");//设置第一行第一列值

//导出excel
FileStream fs = new FileStream(exportExcelPath, FileMode.Create, FileAccess.ReadWrite);
workbook.Write(fs);
fs.Close();
}