NPOI导出excel(带图片)
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近期项目中用到Excel导出功能,之前都是用普通的office组件导出的方法,今天尝试用下NPOI,故作此文以备日后查阅。
1.NPOI官网http://npoi.codeplex.com/,下载最新工具包。
2.选择.net版本(例如dotnet4),引用其中的dll。
3.后台代码
using System; using System.Web; using System.Data; using System.Configuration; using System.IO; using Test_DBUtility; using NPOI; using NPOI.SS.UserModel; using NPOI.HSSF.UserModel; public partial class Handlers_ExportExcel : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { string act = Request["action"].ToString(); DataTable dt = new DataTable(); string sql = string.Empty; int[] array = new int[] { }; switch (act) { case "export": sql = @"select M_MEDIUM 产品图片,PN,CN_NAME 产品名称,EN_NAME 英文名称,DESC_CN 中文描述,DESC_EN 英文描述,REMARKS 备注描述,MANUFACTURER_PN 厂家编码,PROVIDER_FULL_NAME 供应商,SP_RESULT 审批结果," + "RANK 产品定级,BASE_STOCK 基础库存,COST 实际成本,CURRENT_PRICE 现价,SPECIAL_PRICE 特价 from viewsdb_en.dbo.View_ProductExcelExport"; dt = SqlHelper.Query(sql).Tables[0]; array = new int[] { 20, 15, 20, 20, 80, 80, 80, 20, 40, 10, 10, 10, 12, 12, 12 }; //定义列宽 NpoiExcel(dt, "操作表", array); break; } } } /// <summary> /// NPOI导出EXCEL /// </summary> /// <param name="dt">数据源</param> /// <param name="title">导出文件的名称</param> /// <param name="array">列宽数组</param> public void NpoiExcel(DataTable dt, string title, int[] array) { NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("Sheet1"); NPOI.SS.UserModel.IRow headerrow = sheet.CreateRow(0); headerrow.Height = 30 * 20; ICellStyle style = book.CreateCellStyle(); style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin; style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin; style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin; style.WrapText = true; style.Alignment = HorizontalAlignment.Center; style.VerticalAlignment = VerticalAlignment.Center; /*标题*/ for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = headerrow.CreateCell(i); cell.CellStyle = style; cell.SetCellValue(dt.Columns[i].ColumnName); /*设置列宽*/ if (array.Length > 0) { for (int c = 0; c < array.Length; c++) { sheet.SetColumnWidth(c, array[c] * 256); } } } /*内容*/ for (int j = 1; j <= dt.Rows.Count; j++) { NPOI.SS.UserModel.IRow contentrow = sheet.CreateRow(j); contentrow.Height = 100 * 20; for (int k = 0; k < dt.Columns.Count; k++) { ICell cell = contentrow.CreateCell(k); cell.CellStyle = style; if (k == 0) { string picurl = dt.Rows[j - 1][k].ToString(); AddCellPicture(sheet, book, picurl, j, k); } else { cell.CellStyle = style; cell.SetCellValue(dt.Rows[j - 1][k].ToString()); } } } MemoryStream ms = new MemoryStream(); book.Write(ms); Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", HttpUtility.UrlEncode(title + "_" + DateTime.Now.ToString("yyyy-MM-dd"), System.Text.Encoding.UTF8))); Response.BinaryWrite(ms.ToArray()); Response.End(); book = null; ms.Close(); ms.Dispose(); } /// <summary> /// 向sheet插入图片 /// </summary> /// <param name="sheet"></param> /// <param name="workbook"></param> /// <param name="fileurl"></param> /// <param name="row"></param> /// <param name="col"></param> private void AddCellPicture(ISheet sheet, HSSFWorkbook workbook, string fileurl, int row, int col) { try { //由于File类只能读取本地资源,所以在配置文件中配置了物理路径的前半部分 string DiscPath = ConfigurationManager.AppSettings["PictureDiscPath"]; string FileName = DiscPath.Replace("\\", "/") + fileurl.Replace("http://www.bolioptics.com/", ""); if (File.Exists(FileName) == true) { byte[] bytes = System.IO.File.ReadAllBytes(FileName); if (!string.IsNullOrEmpty(FileName)) { int pictureIdx = workbook.AddPicture(bytes, NPOI.SS.UserModel.PictureType.JPEG); HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch(); HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0, col, row, col + 1, row + 1); HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx); } } } catch (Exception ex) { throw ex; } } }
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