上篇讲到使用Office Com组件的方式导出Excel,本篇讲一种个人认为更普遍的方式：NPOI,它无需服务器上安装Office，如果玩NPOI比较熟的话，个人更推荐使用这种方式。
本篇将介绍基本的导出Excel的方法，和合并单元格，设置单元格样式和如何插入图片等。
1.添加对NPOI.dll的引用，引入命名空间：
1 using NPOI; 2 using NPOI.HPSF; 3 using NPOI.HSSF.UserModel; 4 using NPOI.POIFS.FileSystem; 5 using NPOI.SS.Util; 6 using NPOI.SS.UserModel;
其余部分,直接上代码：
1 protected void btn_Click(object sender, EventArgs e)
2 {
3
4 #region 创建DataTable并填充数据
5 DataTable dt = new DataTable();
6 dt.Columns.Add("name", System.Type.GetType("System.String"));
7 dt.Columns.Add("age", System.Type.GetType("System.Int32"));
8 DataRow newRow;
9 newRow = dt.NewRow();
10 newRow["name"] = "zhangsan";
11 newRow["age"] = 30;
12 dt.Rows.Add(newRow);
13
14 newRow = dt.NewRow();
15 newRow["name"] = "lisi";
16 newRow["age"] = 20;
17 dt.Rows.Add(newRow);
18 #endregion
19
20 string TempletFileName = Server.MapPath("~/Template.xls"); //模板文件
21 string ReportFileName = Server.MapPath("~/Restlt.xls"); //导出文件
22 FileStream file = null;
23 try
24 {
25 file = new FileStream(TempletFileName, FileMode.Open, FileAccess.Read);
26 }
27 catch (Exception)
28 {
29 Response.Write("<script>alert(‘模板文件不存在或正在打开‘);</script>");
30 return;
31 }
32 HSSFWorkbook hssfworkbook = new HSSFWorkbook(file);
33 HSSFSheet ws = (HSSFSheet)hssfworkbook.GetSheet("Sheet1");
34 if (ws == null)//工作薄中没有工作表
35 {
36 Response.Write("<script>alert(‘工作薄中没有Sheet1工作表‘);</script>");
37 return;
38 }
39 int count = dt.Rows.Count;
40 if (count > 0)
41 {
42 for (int i = 0; i < count; i++)
43 {
44 int _row = i; //i + 1;
45 HSSFRow row = (HSSFRow)ws.CreateRow(_row);
46 row.CreateCell(0).SetCellValue(dt.Rows[i]["name"].ToString().Trim());
47 row.CreateCell(1).SetCellValue(dt.Rows[i]["age"].ToString().Trim());
48
49 ws.SetColumnWidth(0, 12 * 256);//设置列宽
50 ws.SetColumnWidth(1, 12 * 256);//设置列宽
51 }
52 }
53 ws.ForceFormulaRecalculation = true;
54
55 using (FileStream filess = File.OpenWrite(ReportFileName))
56 {
57 hssfworkbook.Write(filess);
58 }
59 System.IO.FileInfo filet = new System.IO.FileInfo(ReportFileName);
60 Response.Clear();
61 Response.Charset = "GB2312";
62 Response.ContentEncoding = System.Text.Encoding.UTF8;
63 Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode("result.xls"));
64 Response.AddHeader("Content-Length", filet.Length.ToString());
65 Response.ContentType = "application/ms-excel";
66 Response.WriteFile(filet.FullName);
67 Response.End();
68 }
下面附带一下NPOI样式的介绍：
NPOI设置样式比Office Com组件的方式要麻烦的多，比如Office Com组件有个Range类可以选取单元格的范围，NPOI死活找不到。
NPOI可以先设置一些样式，然后在后面使用：
1 #region 各种样式 2 //自定义的样式 3 ICellStyle styleOne = hssfworkbook.CreateCellStyle(); 4 styleOne.BorderBottom = BorderStyle.Thick; 5 styleOne.BorderLeft = BorderStyle.Thick; 6 styleOne.BorderRight = BorderStyle.Thick; 7 styleOne.BorderTop = BorderStyle.Thick; 8 styleOne.VerticalAlignment = VerticalAlignment.Center; 9 //styleOne.FillBackgroundColor = 244; 10 styleOne.WrapText = true; 11 NPOI.SS.UserModel.IFont font = hssfworkbook.CreateFont(); 12 font.FontHeight = 16 * 16; 13 font.Boldweight = 700; 14 styleOne.SetFont(font); 15 16 //垂直居中 17 ICellStyle style0 = hssfworkbook.CreateCellStyle(); 18 style0.VerticalAlignment = VerticalAlignment.Center; 19 20 //四周薄边框 21 ICellStyle style1 = hssfworkbook.CreateCellStyle(); 22 style1.BorderBottom = BorderStyle.Thin; 23 style1.BorderLeft = BorderStyle.Thin; 24 style1.BorderRight = BorderStyle.Thin; 25 style1.BorderTop = BorderStyle.Thin; 26 style1.VerticalAlignment = VerticalAlignment.Center; 27 28 //四周厚边框 29 ICellStyle style2 = hssfworkbook.CreateCellStyle(); 30 style2.BorderBottom = BorderStyle.Thick; 31 style2.BorderLeft = BorderStyle.Thick; 32 style2.BorderRight = BorderStyle.Thick; 33 style2.BorderTop = BorderStyle.Thick; 34 style2.VerticalAlignment = VerticalAlignment.Center; 35 36 //顶部厚边框 37 ICellStyle style3 = hssfworkbook.CreateCellStyle(); 38 style3.BorderTop = BorderStyle.Thick; 39 style3.BorderRight = BorderStyle.Thin; 40 style3.VerticalAlignment = VerticalAlignment.Center; 41 42 //右部厚边框 43 ICellStyle style4 = hssfworkbook.CreateCellStyle(); 44 style4.BorderRight = BorderStyle.Thick; 45 style4.VerticalAlignment = VerticalAlignment.Center; 46 47 //左部厚边框 48 ICellStyle style5 = hssfworkbook.CreateCellStyle(); 49 style5.BorderLeft = BorderStyle.Thick; 50 style5.BorderRight = BorderStyle.Thin; 51 style5.VerticalAlignment = VerticalAlignment.Center; 52 53 //底部厚边框 54 ICellStyle style6 = hssfworkbook.CreateCellStyle(); 55 style6.BorderTop = BorderStyle.Thin; 56 style6.BorderBottom = BorderStyle.Thick; 57 style6.BorderRight = BorderStyle.Thin; 58 style6.VerticalAlignment = VerticalAlignment.Center; 59 60 //文字上对齐 61 ICellStyle style7 = hssfworkbook.CreateCellStyle(); 62 style7.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; 63 style7.VerticalAlignment = VerticalAlignment.Top; 64 65 #endregion
如何使用这些样式：
1 //设置第一行第一列单元格样式为style2 2 HSSFRow row = (HSSFRow)ws.CreateRow(0); 3 row.GetCell(0).CellStyle = style2;
合并单元格的方法
/// <summary>
/// 合并单元格
/// </summary>
private void mergeCell(HSSFSheet sheet, int firstRow, int lastRow, int firstCell, int lastCell)
{
sheet.AddMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCell, lastCell));
}
在单元格中插入图片
1 private void NpoiInsertPicture(IWorkbook workbook, ISheet sheet, string imagePath, int col1, int row1, int col2, int row2, int dx1, int dy1)
2 {
3 try
4 {
5 FileStream fs = new FileStream(imagePath, FileMode.Open, FileAccess.Read);
6 byte[] Content = new byte[Convert.ToInt32(fs.Length)];
7 fs.Read(Content, 0, Convert.ToInt32(fs.Length));
8
9 int pictureIdx = workbook.AddPicture(Content, NPOI.SS.UserModel.PictureType.JPEG);
10 HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();
11 // 参数的解析: HSSFClientAnchor（int dx1,int dy1,int dx2,int dy2,int col1,int row1,int col2,int row2)
12 //dx1:图片左边相对excel格的位置(x偏移) 范围值为:0~1023;即输100 偏移的位置大概是相对于整个单元格的宽度的100除以1023大概是10分之一
13 //dy1:图片上方相对excel格的位置(y偏移) 范围值为:0~256 原理同上。
14 //dx2:图片右边相对excel格的位置(x偏移) 范围值为:0~1023; 原理同上。
15 //dy2:图片下方相对excel格的位置(y偏移) 范围值为:0~256 原理同上。
16 //col1和row1 :图片左上角的位置，以excel单元格为参考,比喻这两个值为(1,1)，那么图片左上角的位置就是excel表(1,1)单元格的右下角的点(A,1)右下角的点。
17 //col2和row2:图片右下角的位置，以excel单元格为参考,比喻这两个值为(2,2)，那么图片右下角的位置就是excel表(2,2)单元格的右下角的点(B,2)右下角的点。
18
19 HSSFClientAnchor anchor = new HSSFClientAnchor(dx1, dy1, 0, 0, col1, row1, col2, row2);
20 HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
21 }
22 catch (Exception)
23 {
24 }
25
26 }
时间： 2024-10-15 21:41:13