源地址：http://www.cnblogs.com/dreamof/archive/2010/06/02/1750151.html\
1、NPOI官方网站：http://npoi.codeplex.com/
可以到此网站上去下载最新的NPOI组件版本
2、NPOI在线学习教程（中文版）：
http://www.cnblogs.com/tonyqus/archive/2009/04/12/1434209.html
感谢Tony Qu分享出NPOI组件的使用方法
3、.NET调用NPOI组件导入导出Excel的操作类
此NPOI操作类的优点如下：
（1）支持web及winform从DataTable导出到Excel；
（2）生成速度很快；
（3）准确判断数据类型，不会出现身份证转数值等问题；
（4）如果单页条数大于65535时会新建工作表；
（5）列宽自适应；
NPOI操作类
<!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
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--> 1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Web;
5 using System.Web.Security;
6 using System.Web.UI;
7 using System.Web.UI.HtmlControls;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.IO;
11 using System.Text;
12 using NPOI;
13 using NPOI.HPSF;
14 using NPOI.HSSF;
15 using NPOI.HSSF.UserModel;
16 using NPOI.HSSF.Util;
17 using NPOI.POIFS;
18 using NPOI.Util;
20 namespace PMS.Common
21 {
22 public class NPOIHelper
23 {
24 /// <summary>
25 /// DataTable导出到Excel文件
26 /// </summary>
27 /// <param name="dtSource">源DataTable</param>
28 /// <param name="strHeaderText">表头文本</param>
29 /// <param name="strFileName">保存位置</param>
30 public static void Export(DataTable dtSource,string strHeaderText,string strFileName)
31 {
32 using (MemoryStream ms= Export(dtSource, strHeaderText))
33 {
34 using (FileStream fs= new FileStream(strFileName, FileMode.Create, FileAccess.Write))
35 {
36 byte[] data = ms.ToArray();
37 fs.Write(data,0, data.Length);
38 fs.Flush();
39 }
40 }
41 }
42
43 /// <summary>
44 /// DataTable导出到Excel的MemoryStream
45 /// </summary>
46 /// <param name="dtSource">源DataTable</param>
47 /// <param name="strHeaderText">表头文本</param>
48 public static MemoryStream Export(DataTable dtSource,string strHeaderText)
49 {
50 HSSFWorkbook workbook= new HSSFWorkbook();
51 HSSFSheet sheet= workbook.CreateSheet();
52
53 #region 右击文件 属性信息
54 {
55 DocumentSummaryInformation dsi= PropertySetFactory.CreateDocumentSummaryInformation();
56 dsi.Company= "NPOI";
57 workbook.DocumentSummaryInformation= dsi;
58
59 SummaryInformation si= PropertySetFactory.CreateSummaryInformation();
60 si.Author= "文件作者信息";//填加xls文件作者信息
61 si.ApplicationName= "创建程序信息";//填加xls文件创建程序信息
62 si.LastAuthor= "最后保存者信息";//填加xls文件最后保存者信息
63 si.Comments= "作者信息";//填加xls文件作者信息
64 si.Title= "标题信息";//填加xls文件标题信息
65 si.Subject= "主题信息";//填加文件主题信息
66 si.CreateDateTime= DateTime.Now;
67 workbook.SummaryInformation= si;
68 }
69 #endregion
70
71 HSSFCellStyle dateStyle= workbook.CreateCellStyle();
72 HSSFDataFormat format= workbook.CreateDataFormat();
73 dateStyle.DataFormat= format.GetFormat("yyyy-mm-dd");
74
75 //取得列宽
76 int[] arrColWidth= newint[dtSource.Columns.Count];
77 foreach (DataColumn itemin dtSource.Columns)
78 {
79 arrColWidth[item.Ordinal]= Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
80 }
81 for (int i= 0; i< dtSource.Rows.Count; i++)
82 {
83 for (int j= 0; j< dtSource.Columns.Count; j++)
84 {
85 int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
86 if (intTemp > arrColWidth[j])
87 {
88 arrColWidth[j]= intTemp;
89 }
90 }
91 }
95 int rowIndex = 0;
97 foreach (DataRow rowin dtSource.Rows)
98 {
99 #region 新建表，填充表头，填充列头，样式
100 if (rowIndex == 65535|| rowIndex== 0)
101 {
102 if (rowIndex != 0)
103 {
104 sheet= workbook.CreateSheet();
105 }
106
107 #region 表头及样式
108 {
109 HSSFRow headerRow= sheet.CreateRow(0);
110 headerRow.HeightInPoints= 25;
111 headerRow.CreateCell(0).SetCellValue(strHeaderText);
112
113 HSSFCellStyle headStyle= workbook.CreateCellStyle();
114 headStyle.Alignment= CellHorizontalAlignment.CENTER;
115 HSSFFont font= workbook.CreateFont();
116 font.FontHeightInPoints= 20;
117 font.Boldweight= 700;
118 headStyle.SetFont(font);
119 headerRow.GetCell(0).CellStyle= headStyle;
120 sheet.AddMergedRegion(new Region(0,0, 0, dtSource.Columns.Count-1));
121 headerRow.Dispose();
122 }
123 #endregion
124
125
126 #region 列头及样式
127 {
128 HSSFRow headerRow= sheet.CreateRow(1);
131 HSSFCellStyle headStyle= workbook.CreateCellStyle();
132 headStyle.Alignment= CellHorizontalAlignment.CENTER;
133 HSSFFont font= workbook.CreateFont();
134 font.FontHeightInPoints= 10;
135 font.Boldweight= 700;
136 headStyle.SetFont(font);
139 foreach (DataColumn columnin dtSource.Columns)
140 {
141 headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
142 headerRow.GetCell(column.Ordinal).CellStyle= headStyle;
143
144 //设置列宽
145 sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal]+ 1)* 256);
147 }
148 headerRow.Dispose();
149 }
150 #endregion
151
152 rowIndex= 2;
153 }
154 #endregion
155
156
157 #region 填充内容
158 HSSFRow dataRow= sheet.CreateRow(rowIndex);
159 foreach (DataColumn columnin dtSource.Columns)
160 {
161 HSSFCell newCell= dataRow.CreateCell(column.Ordinal);
162
163 string drValue= row[column].ToString();
164
165 switch (column.DataType.ToString())
166 {
167 case "System.String"://字符串类型
168 newCell.SetCellValue(drValue);
169 break;
170 case "System.DateTime"://日期类型
171 DateTime dateV;
172 DateTime.TryParse(drValue,out dateV);
173 newCell.SetCellValue(dateV);
174
175 newCell.CellStyle= dateStyle;//格式化显示
176 break;
177 case "System.Boolean"://布尔型
178 bool boolV = false;
179 bool.TryParse(drValue,out boolV);
180 newCell.SetCellValue(boolV);
181 break;
182 case "System.Int16"://整型
183 case "System.Int32":
184 case "System.Int64":
185 case "System.Byte":
186 int intV = 0;
187 int.TryParse(drValue,out intV);
188 newCell.SetCellValue(intV);
189 break;
190 case "System.Decimal"://浮点型
191 case "System.Double":
192 double doubV = 0;
193 double.TryParse(drValue,out doubV);
194 newCell.SetCellValue(doubV);
195 break;
196 case "System.DBNull"://空值处理
197 newCell.SetCellValue("");
198 break;
199 default:
200 newCell.SetCellValue("");
201 break;
202 }
203
204 }
205 #endregion
206
207 rowIndex++;
208 }
211 using (MemoryStream ms= new MemoryStream())
212 {
213 workbook.Write(ms);
214 ms.Flush();
215 ms.Position= 0;
216
217 sheet.Dispose();
218 //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
219 return ms;
220 }
222 }
223
224 /// <summary>
225 /// 用于Web导出
226 /// </summary>
227 /// <param name="dtSource">源DataTable</param>
228 /// <param name="strHeaderText">表头文本</param>
229 /// <param name="strFileName">文件名</param>
230 public static void ExportByWeb(DataTable dtSource,string strHeaderText,stringstrFileName)
231 {
233 HttpContext curContext= HttpContext.Current;
234
235 // 设置编码和附件格式
236 curContext.Response.ContentType= "application/vnd.ms-excel";
237 curContext.Response.ContentEncoding= Encoding.UTF8;
238 curContext.Response.Charset= "";
239 curContext.Response.AppendHeader("Content-Disposition",
240 "attachment;filename="+ HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
241
242 curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
243 curContext.Response.End();
245 }
247
248 /// <summary>读取excel
249 /// 默认第一行为标头
250 /// </summary>
251 /// <param name="strFileName">excel文档路径</param>
252 /// <returns></returns>
253 public static DataTable Import(string strFileName)
254 {
255 DataTable dt= new DataTable();
256
257 HSSFWorkbook hssfworkbook;
258 using (FileStream file= new FileStream(strFileName, FileMode.Open, FileAccess.Read))
259 {
260 hssfworkbook= new HSSFWorkbook(file);
261 }
262 HSSFSheet sheet= hssfworkbook.GetSheetAt(0);
263 System.Collections.IEnumerator rows= sheet.GetRowEnumerator();
264
265 HSSFRow headerRow= sheet.GetRow(0);
266 int cellCount= headerRow.LastCellNum;
267
268 for (int j= 0; j< cellCount; j++)
269 {
270 HSSFCell cell= headerRow.GetCell(j);
271 dt.Columns.Add(cell.ToString());
272 }
273
274 for (int i= (sheet.FirstRowNum+ 1); i<= sheet.LastRowNum; i++)
275 {
276 HSSFRow row= sheet.GetRow(i);
277 DataRow dataRow= dt.NewRow();
278
279 for (int j= row.FirstCellNum; j< cellCount; j++)
280 {
281 if (row.GetCell(j)!= null)
282 dataRow[j]= row.GetCell(j).ToString();
283 }
284
285 dt.Rows.Add(dataRow);
286 }
287 return dt;
288 }
289 }
290 }
291
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--> 1 using System;
2 using System.Data;
3 using System.Configuration;
4 using System.Web;
5 using System.Web.Security;
6 using System.Web.UI;
7 using System.Web.UI.HtmlControls;
8 using System.Web.UI.WebControls;
9 using System.Web.UI.WebControls.WebParts;
10 using System.IO;
11 using System.Text;
12 using NPOI;
13 using NPOI.HPSF;
14 using NPOI.HSSF;
15 using NPOI.HSSF.UserModel;
16 using NPOI.HSSF.Util;
17 using NPOI.POIFS;
18 using NPOI.Util;
20 namespace PMS.Common
21 {
22 public class NPOIHelper
23 {
24 /// <summary>
25 /// DataTable导出到Excel文件
26 /// </summary>
27 /// <param name="dtSource">源DataTable</param>
28 /// <param name="strHeaderText">表头文本</param>
29 /// <param name="strFileName">保存位置</param>
30 public static void Export(DataTable dtSource,string strHeaderText,string strFileName)
31 {
32 using (MemoryStream ms= Export(dtSource, strHeaderText))
33 {
34 using (FileStream fs= new FileStream(strFileName, FileMode.Create, FileAccess.Write))
35 {
36 byte[] data = ms.ToArray();
37 fs.Write(data,0, data.Length);
38 fs.Flush();
39 }
40 }
41 }
42
43 /// <summary>
44 /// DataTable导出到Excel的MemoryStream
45 /// </summary>
46 /// <param name="dtSource">源DataTable</param>
47 /// <param name="strHeaderText">表头文本</param>
48 public static MemoryStream Export(DataTable dtSource,string strHeaderText)
49 {
50 HSSFWorkbook workbook= new HSSFWorkbook();
51 HSSFSheet sheet= workbook.CreateSheet();
52
53 #region 右击文件 属性信息
54 {
55 DocumentSummaryInformation dsi= PropertySetFactory.CreateDocumentSummaryInformation();
56 dsi.Company= "NPOI";
57 workbook.DocumentSummaryInformation= dsi;
58
59 SummaryInformation si= PropertySetFactory.CreateSummaryInformation();
60 si.Author= "文件作者信息";//填加xls文件作者信息
61 si.ApplicationName= "创建程序信息";//填加xls文件创建程序信息
62 si.LastAuthor= "最后保存者信息";//填加xls文件最后保存者信息
63 si.Comments= "作者信息";//填加xls文件作者信息
64 si.Title= "标题信息";//填加xls文件标题信息
65 si.Subject= "主题信息";//填加文件主题信息
66 si.CreateDateTime= DateTime.Now;
67 workbook.SummaryInformation= si;
68 }
69 #endregion
70
71 HSSFCellStyle dateStyle= workbook.CreateCellStyle();
72 HSSFDataFormat format= workbook.CreateDataFormat();
73 dateStyle.DataFormat= format.GetFormat("yyyy-mm-dd");
74
75 //取得列宽
76 int[] arrColWidth= newint[dtSource.Columns.Count];
77 foreach (DataColumn itemin dtSource.Columns)
78 {
79 arrColWidth[item.Ordinal]= Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
80 }
81 for (int i= 0; i< dtSource.Rows.Count; i++)
82 {
83 for (int j= 0; j< dtSource.Columns.Count; j++)
84 {
85 int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
86 if (intTemp > arrColWidth[j])
87 {
88 arrColWidth[j]= intTemp;
89 }
90 }
91 }
95 int rowIndex = 0;
97 foreach (DataRow rowin dtSource.Rows)
98 {
99 #region 新建表，填充表头，填充列头，样式
100 if (rowIndex == 65535|| rowIndex== 0)
101 {
102 if (rowIndex != 0)
103 {
104 sheet= workbook.CreateSheet();
105 }
106
107 #region 表头及样式
108 {
109 HSSFRow headerRow= sheet.CreateRow(0);
110 headerRow.HeightInPoints= 25;
111 headerRow.CreateCell(0).SetCellValue(strHeaderText);
112
113 HSSFCellStyle headStyle= workbook.CreateCellStyle();
114 headStyle.Alignment= CellHorizontalAlignment.CENTER;
115 HSSFFont font= workbook.CreateFont();
116 font.FontHeightInPoints= 20;
117 font.Boldweight= 700;
118 headStyle.SetFont(font);
119 headerRow.GetCell(0).CellStyle= headStyle;
120 sheet.AddMergedRegion(new Region(0,0, 0, dtSource.Columns.Count-1));
121 headerRow.Dispose();
122 }
123 #endregion
124
125
126 #region 列头及样式
127 {
128 HSSFRow headerRow= sheet.CreateRow(1);
131 HSSFCellStyle headStyle= workbook.CreateCellStyle();
132 headStyle.Alignment= CellHorizontalAlignment.CENTER;
133 HSSFFont font= workbook.CreateFont();
134 font.FontHeightInPoints= 10;
135 font.Boldweight= 700;
136 headStyle.SetFont(font);
139 foreach (DataColumn columnin dtSource.Columns)
140 {
141 headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
142 headerRow.GetCell(column.Ordinal).CellStyle= headStyle;
143
144 //设置列宽
145 sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal]+ 1)* 256);
147 }
148 headerRow.Dispose();
149 }
150 #endregion
151
152 rowIndex= 2;
153 }
154 #endregion
155
156
157 #region 填充内容
158 HSSFRow dataRow= sheet.CreateRow(rowIndex);
159 foreach (DataColumn columnin dtSource.Columns)
160 {
161 HSSFCell newCell= dataRow.CreateCell(column.Ordinal);
162
163 string drValue= row[column].ToString();
164
165 switch (column.DataType.ToString())
166 {
167 case "System.String"://字符串类型
168 newCell.SetCellValue(drValue);
169 break;
170 case "System.DateTime"://日期类型
171 DateTime dateV;
172 DateTime.TryParse(drValue,out dateV);
173 newCell.SetCellValue(dateV);
174
175 newCell.CellStyle= dateStyle;//格式化显示
176 break;
177 case "System.Boolean"://布尔型
178 bool boolV = false;
179 bool.TryParse(drValue,out boolV);
180 newCell.SetCellValue(boolV);
181 break;
182 case "System.Int16"://整型
183 case "System.Int32":
184 case "System.Int64":
185 case "System.Byte":
186 int intV = 0;
187 int.TryParse(drValue,out intV);
188 newCell.SetCellValue(intV);
189 break;
190 case "System.Decimal"://浮点型
191 case "System.Double":
192 double doubV = 0;
193 double.TryParse(drValue,out doubV);
194 newCell.SetCellValue(doubV);
195 break;
196 case "System.DBNull"://空值处理
197 newCell.SetCellValue("");
198 break;
199 default:
200 newCell.SetCellValue("");
201 break;
202 }
203
204 }
205 #endregion
206
207 rowIndex++;
208 }
211 using (MemoryStream ms= new MemoryStream())
212 {
213 workbook.Write(ms);
214 ms.Flush();
215 ms.Position= 0;
216
217 sheet.Dispose();
218 //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
219 return ms;
220 }
222 }
223
224 /// <summary>
225 /// 用于Web导出
226 /// </summary>
227 /// <param name="dtSource">源DataTable</param>
228 /// <param name="strHeaderText">表头文本</param>
229 /// <param name="strFileName">文件名</param>
230 public static void ExportByWeb(DataTable dtSource,string strHeaderText,stringstrFileName)
231 {
233 HttpContext curContext= HttpContext.Current;
234
235 // 设置编码和附件格式
236 curContext.Response.ContentType= "application/vnd.ms-excel";
237 curContext.Response.ContentEncoding= Encoding.UTF8;
238 curContext.Response.Charset= "";
239 curContext.Response.AppendHeader("Content-Disposition",
240 "attachment;filename="+ HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
241
242 curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
243 curContext.Response.End();
245 }
247
248 /// <summary>读取excel
249 /// 默认第一行为标头
250 /// </summary>
251 /// <param name="strFileName">excel文档路径</param>
252 /// <returns></returns>
253 public static DataTable Import(string strFileName)
254 {
255 DataTable dt= new DataTable();
256
257 HSSFWorkbook hssfworkbook;
258 using (FileStream file= new FileStream(strFileName, FileMode.Open, FileAccess.Read))
259 {
260 hssfworkbook= new HSSFWorkbook(file);
261 }
262 HSSFSheet sheet= hssfworkbook.GetSheetAt(0);
263 System.Collections.IEnumerator rows= sheet.GetRowEnumerator();
264
265 HSSFRow headerRow= sheet.GetRow(0);
266 int cellCount= headerRow.LastCellNum;
267
268 for (int j= 0; j< cellCount; j++)
269 {
270 HSSFCell cell= headerRow.GetCell(j);
271 dt.Columns.Add(cell.ToString());
272 }
273
274 for (int i= (sheet.FirstRowNum+ 1); i<= sheet.LastRowNum; i++)
275 {
276 HSSFRow row= sheet.GetRow(i);
277 DataRow dataRow= dt.NewRow();
278
279 for (int j= row.FirstCellNum; j< cellCount; j++)
280 {
281 if (row.GetCell(j)!= null)
282 dataRow[j]= row.GetCell(j).ToString();
283 }
284
285 dt.Rows.Add(dataRow);
286 }
287 return dt;
288 }
289 }
290 }
291
4、NPOI操作类的调用方法
DataTable dt_Grade = Tools.Data.GetDataTable(strSQL);
filename += "绩效考核结果分数统计表";
PMS.Common.NPOIHelper.ExportByWeb(dt_Grade, filename, filename+".xls");
5、效果展示
6、NPOI类库下载：https://files.cnblogs.com/dreamof/NPOI类库.rar
信息来源：http://www.cnblogs.com/yongfa365/archive/2010/05/10/NPOI-MyXls-DataTable-To-Excel-From-Excel.html
