NPOI导出Excel示例

摘要：使用开源程序NPOI导出Excel示例。NPOI首页地址：http://npoi.codeplex.com/，NPOI示例博客：http://tonyqus.sinaapp.com/。

示例编写环境：

操做系统：Windows7 Ultimate SP1 64bit

开发软件：Visual Studio Ultimate 2012 Update 3

Office版本：Office Home and Student 2010

NPOI版本：NPOI 2.0

 

示例界面以下：

本示例中使用到的命名空间：

 1 using System;
 2 using System.Data;
 3 using System.Web;
 4 using System.Web.UI;
 5 using System.Collections.Generic;
 6 using System.Web.UI.WebControls;
 7 using System.IO;
 8 using System.Text;
 9 using NPOI.SS.UserModel;
10 using NPOI.HSSF.UserModel;
11 using NPOI.HSSF.Util;
12 using NPOI.HPSF;
13 using NPOI.POIFS.FileSystem;
14 using NPOI.SS.Util;

导出按钮代码：

 1 protected void btnExportClick(object sender, EventArgs e)
 2 {
 3     // 文件名最好使用英文，中文可能会出现乱码或者丢失文件后缀
 4     string filename = "ReportExport" + DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss");
 5     Response.Clear();
 6     Response.ContentType = "application/vnd.ms-excel";
 7     Response.AppendHeader("Content-Type", "applicationnd.ms-excel");
 8     Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
 9 
10     // getData()函数返回一个DataTable类型，在本实例中用于得到要导出的数据，可根据项目状况替换该函数
11     Response.BinaryWrite(getExportContent(getData()).GetBuffer());
12     Response.Flush();
13     // 若使用Response.End方法会致使ThreadAbortException 异常，使用下面的语句替换Response.End方法
14     HttpContext.Current.ApplicationInstance.CompleteRequest();
15 }

 

负责生成导出信息的方法getExportContent示例代码以下：

 1 private MemoryStream getExportContent(DataTable table)
 2 {
 3     // 添加Excel元数据信息
 4     HSSFWorkbook book = new HSSFWorkbook();
 5     DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
 6     dsi.Company = "MyCompany";
 7     book.DocumentSummaryInformation = dsi;
 8 
 9     SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
10     si.Subject = "MySubject";
11     book.SummaryInformation = si;
12 
13     // 声明必要的变量
14     MemoryStream ms = new MemoryStream();
15     ISheet sheet = book.CreateSheet("sheet1");
16     IRow erow = sheet.CreateRow(0);
17 
18     // 设置列宽，列宽的单位是256分之一字符，因此10*256表示10个字符宽度
19     sheet.SetColumnWidth(1, 20 * 256);
20     sheet.SetColumnWidth(2, 20 * 256);
21     sheet.SetColumnWidth(3, 10 * 256);
22     sheet.SetColumnWidth(4, 10 * 256);
23 
24     // 增长表头
25     buildSheetTitle(book);
26 
27     // 增长内容，标题占两行，从第三行添加数据内容。
28     // 在NPOI中行列以0做为起始
29     int rindex = 2;
30     foreach (DataRow r in table.Rows)
31     {
32         erow = sheet.CreateRow(rindex);
33         // 序号
34         erow.CreateCell(0).SetCellValue(rindex - 1);
35         for (int c = 0; c < table.Columns.Count; c++)
36         {
37             erow.CreateCell(c + 1).SetCellValue(r[c].ToString());
38         }
39         rindex++;
40     }
41     //  对相同的列进行纵向合并
42     mergeColumn(book);
43 
44 
45     book.Write(ms);
46     ms.Flush();
47     ms.Position = 0;
48     return ms;
49 }

 

增长表头方法buildSheetTitle示例代码：

 1 private void buildSheetTitle(HSSFWorkbook book)
 2 {
 3     // 定义必要变量
 4     ISheet sheet = book.GetSheetAt(0);
 5     IRow erow = sheet.CreateRow(0);
 6     ICell cell = null;
 7     // 单元格样式
 8     ICellStyle style = book.CreateCellStyle();
 9     style.Alignment = HorizontalAlignment.CENTER;
10     style.VerticalAlignment = VerticalAlignment.CENTER;
11     IFont font = book.CreateFont();
12     font.FontHeightInPoints = 12;
13     font.FontName = "宋体";
14     style.SetFont(font);
15 
16     // 增长第一行标题
17     cell = erow.CreateCell(0);
18     cell.SetCellValue("序号");
19     cell.CellStyle = style;
20     sheet.AddMergedRegion(new CellRangeAddress(0, 1, 0, 0));
21 
22     cell = erow.CreateCell(1);
23     cell.SetCellValue("装置名称");
24     cell.CellStyle = style;
25     sheet.AddMergedRegion(new CellRangeAddress(0, 1, 1, 1));
26 
27     cell = erow.CreateCell(2);
28     cell.SetCellValue("物料信息");
29     cell.CellStyle = style;
30     sheet.AddMergedRegion(new CellRangeAddress(0, 0, 2, 3));
31 
32     // 增长第二行标题
33     erow = sheet.CreateRow(1);
34     cell = erow.CreateCell(2);
35     cell.SetCellValue("物料名称");
36     cell.CellStyle = style;
37     cell = erow.CreateCell(3);
38     cell.SetCellValue("小计");
39     cell.CellStyle = style;
40 }

 

合并单元格方法mergeColumn示例代码以下：

 1 private void mergeColumn(HSSFWorkbook book)
 2 {
 3     ISheet sheet = book.GetSheetAt(0);
 4     int cunit = 1;
 5     // 合并单元格跨越的行数
 6     int rspan = 0;
 7     // 需合并单元格的起始行，前两行为标题，默认起始行是第三行
 8     int srow = 2;
 9 
10     // 单元格字体样式
11     IFont font = book.CreateFont();
12     font.FontHeightInPoints = 12;
13     font.FontName = "宋体";
14 
15     // 非合并单元格样式
16     ICellStyle style = book.CreateCellStyle();
17     style.SetFont(font);
18 
19     // 合并单元格样式
20     ICellStyle mstyle = book.CreateCellStyle();
21     mstyle.Alignment = HorizontalAlignment.CENTER;
22     mstyle.VerticalAlignment = VerticalAlignment.CENTER;
23     mstyle.SetFont(font);
24 
25 
26     // 合并单元格
27     string oldvalue = string.Empty;
28     for (int r = 2; r < sheet.PhysicalNumberOfRows; r++)
29     {
30         if (sheet.GetRow(r).GetCell(cunit).StringCellValue == oldvalue)
31         {
32             rspan++;
33         }
34         else
35         {
36             // 添加合并区域
37             sheet.AddMergedRegion(new CellRangeAddress(srow, srow + rspan, 1, 1));
38             oldvalue = sheet.GetRow(r).GetCell(cunit).StringCellValue;
39             srow = r;
40             rspan = 0;
41         }
42     }
43 
44     // 对未合并的单元格进行合并
45     if (rspan != 0)
46     {
47         sheet.AddMergedRegion(new CellRangeAddress(srow, srow + rspan, 1, 1));
48     }
49 
50     // 调整合并单元格的样式
51     for (int c = 0; c < 4; c++)
52     {
53         for (int r = 2; r < sheet.PhysicalNumberOfRows; r++)
54         {
55             if (c == cunit)
56             {
57                 sheet.GetRow(r).GetCell(c).CellStyle = mstyle;
58             }
59             else
60             {
61                 sheet.GetRow(r).GetCell(c).CellStyle = style;
62             }
63         }
64     }
65 }

 

导出后的文件内容：