NPOI導出Excel示例

時間 2019-11-16

標籤 npoi 導出 excel 示例欄目 Java開源简体版

原文原文鏈接

摘要：使用開源程序NPOI導出Excel示例。NPOI首頁地址：http://npoi.codeplex.com/，NPOI示例博客：http://tonyqus.sinaapp.com/。c++

示例編寫環境：app

操做系統：Windows7 Ultimate SP1 64bit函數

開發軟件：Visual Studio Ultimate 2012 Update 3字體

Office版本：Office Home and Student 2010ui

NPOI版本：NPOI 2.0spa

示例界面以下：操作系統

本示例中使用到的命名空間：excel

 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;

導出按鈕代碼：code

 1 protected void btnExportClick(object sender, EventArgs e)
 2 {
 3     // 文件名最好使用英文，中文可能會出現亂碼或者丟失文件後綴
 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()函數返回一個DataTable類型，在本實例中用於得到要導出的數據，可根據項目狀況替換該函數
11     Response.BinaryWrite(getExportContent(getData()).GetBuffer());
12     Response.Flush();
13     // 若使用Response.End方法會致使ThreadAbortException 異常，使用下面的語句替換Response.End方法
14     HttpContext.Current.ApplicationInstance.CompleteRequest();
15 }

負責生成導出信息的方法getExportContent示例代碼以下：orm

 1 private MemoryStream getExportContent(DataTable table)
 2 {
 3     // 添加Excel元數據信息
 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     // 聲明必要的變量
14     MemoryStream ms = new MemoryStream();
15     ISheet sheet = book.CreateSheet("sheet1");
16     IRow erow = sheet.CreateRow(0);
17 
18     // 設置列寬，列寬的單位是256分之一字符，因此10*256表示10個字符寬度
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     // 增長表頭
25     buildSheetTitle(book);
26 
27     // 增長內容，標題佔兩行，從第三行添加數據內容。
28     // 在NPOI中行列以0做爲起始
29     int rindex = 2;
30     foreach (DataRow r in table.Rows)
31     {
32         erow = sheet.CreateRow(rindex);
33         // 序號
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     //  對相同的列進行縱向合併
42     mergeColumn(book);
43 
44 
45     book.Write(ms);
46     ms.Flush();
47     ms.Position = 0;
48     return ms;
49 }

增長表頭方法buildSheetTitle示例代碼：

 1 private void buildSheetTitle(HSSFWorkbook book)
 2 {
 3     // 定義必要變量
 4     ISheet sheet = book.GetSheetAt(0);
 5     IRow erow = sheet.CreateRow(0);
 6     ICell cell = null;
 7     // 單元格樣式
 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 = "宋體";
14     style.SetFont(font);
15 
16     // 增長第一行標題
17     cell = erow.CreateCell(0);
18     cell.SetCellValue("序號");
19     cell.CellStyle = style;
20     sheet.AddMergedRegion(new CellRangeAddress(0, 1, 0, 0));
21 
22     cell = erow.CreateCell(1);
23     cell.SetCellValue("裝置名稱");
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     // 增長第二行標題
33     erow = sheet.CreateRow(1);
34     cell = erow.CreateCell(2);
35     cell.SetCellValue("物料名稱");
36     cell.CellStyle = style;
37     cell = erow.CreateCell(3);
38     cell.SetCellValue("小計");
39     cell.CellStyle = style;
40 }

合併單元格方法mergeColumn示例代碼以下：

 1 private void mergeColumn(HSSFWorkbook book)
 2 {
 3     ISheet sheet = book.GetSheetAt(0);
 4     int cunit = 1;
 5     // 合併單元格跨越的行數
 6     int rspan = 0;
 7     // 需合併單元格的起始行，前兩行爲標題，默認起始行是第三行
 8     int srow = 2;
 9 
10     // 單元格字體樣式
11     IFont font = book.CreateFont();
12     font.FontHeightInPoints = 12;
13     font.FontName = "宋體";
14 
15     // 非合併單元格樣式
16     ICellStyle style = book.CreateCellStyle();
17     style.SetFont(font);
18 
19     // 合併單元格樣式
20     ICellStyle mstyle = book.CreateCellStyle();
21     mstyle.Alignment = HorizontalAlignment.CENTER;
22     mstyle.VerticalAlignment = VerticalAlignment.CENTER;
23     mstyle.SetFont(font);
24 
25 
26     // 合併單元格
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             // 添加合併區域
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     // 對未合併的單元格進行合併
45     if (rspan != 0)
46     {
47         sheet.AddMergedRegion(new CellRangeAddress(srow, srow + rspan, 1, 1));
48     }
49 
50     // 調整合並單元格的樣式
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 }