NPOI导入导出相关类：
1 using System;
2 using System.Collections.Generic;
3 using System.Data;
4 using System.IO;
5 using System.Text;
6 using System.Web;
7 using NPOI;
8 using NPOI.HPSF;
9 using NPOI.HSSF;
10 using NPOI.HSSF.UserModel;
11 using NPOI.HSSF.Util;
12 using NPOI.POIFS;
13 using NPOI.Util;
14
15
16 public class ExcelHelper
17 {
18 /// <summary>
19 /// DataTable导出到Excel文件
20 /// </summary>
21 /// <param name="dtSource">源DataTable</param>
22 /// <param name="strHeaderText">表头文本</param>
23 /// <param name="strFileName">保存位置</param>
24 /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
25 public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
26 {
27 using (MemoryStream ms = Export(dtSource, strHeaderText))
28 {
29 using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
30 {
31 byte[] data = ms.ToArray();
32 fs.Write(data, 0, data.Length);
33 fs.Flush();
34 }
35 }
36 }
37
38 /// <summary>
39 /// DataTable导出到Excel的MemoryStream
40 /// </summary>
41 /// <param name="dtSource">源DataTable</param>
42 /// <param name="strHeaderText">表头文本</param>
43 /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
44 public static MemoryStream Export(DataTable dtSource, string strHeaderText)
45 {
46 HSSFWorkbook workbook = new HSSFWorkbook();
47 HSSFSheet sheet = workbook.CreateSheet();
48
49 #region 右击文件 属性信息
50 {
51 DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
52 dsi.Company = "http://www.yongfa365.com/";
53 workbook.DocumentSummaryInformation = dsi;
54
55 SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
56 si.Author = "柳永法"; //填加xls文件作者信息
57 si.ApplicationName = "NPOI测试程序"; //填加xls文件创建程序信息
58 si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
59 si.Comments = "说明信息"; //填加xls文件作者信息
60 si.Title = "NPOI测试"; //填加xls文件标题信息
61 si.Subject = "NPOI测试Demo";//填加文件主题信息
62 si.CreateDateTime = DateTime.Now;
63 workbook.SummaryInformation = si;
64 }
65 #endregion
66
67 HSSFCellStyle dateStyle = workbook.CreateCellStyle();
68 HSSFDataFormat format = workbook.CreateDataFormat();
69 dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
70
71 //取得列宽
72 int[] arrColWidth = new int[dtSource.Columns.Count];
73 foreach (DataColumn item in dtSource.Columns)
74 {
75 arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
76 }
77 for (int i = 0; i < dtSource.Rows.Count; i++)
78 {
79 for (int j = 0; j < dtSource.Columns.Count; j++)
80 {
81 int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
82 if (intTemp > arrColWidth[j])
83 {
84 arrColWidth[j] = intTemp;
85 }
86 }
87 }
88
89
90
91 int rowIndex = 0;
92
93 foreach (DataRow row in dtSource.Rows)
94 {
95 #region 新建表，填充表头，填充列头，样式
96 if (rowIndex == 65535 || rowIndex == 0)
97 {
98 if (rowIndex != 0)
99 {
100 sheet = workbook.CreateSheet();
101 }
102
103 #region 表头及样式
104 {
105 HSSFRow headerRow = sheet.CreateRow(0);
106 headerRow.HeightInPoints = 25;
107 headerRow.CreateCell(0).SetCellValue(strHeaderText);
108
109 HSSFCellStyle headStyle = workbook.CreateCellStyle();
110 headStyle.Alignment = CellHorizontalAlignment.CENTER;
111 HSSFFont font = workbook.CreateFont();
112 font.FontHeightInPoints = 20;
113 font.Boldweight = 700;
114 headStyle.SetFont(font);
115
116 headerRow.GetCell(0).CellStyle = headStyle;
117
118 sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
119 headerRow.Dispose();
120 }
121 #endregion
122
123
124 #region 列头及样式
125 {
126 HSSFRow headerRow = sheet.CreateRow(1);
127
128
129 HSSFCellStyle headStyle = workbook.CreateCellStyle();
130 headStyle.Alignment = CellHorizontalAlignment.CENTER;
131 HSSFFont font = workbook.CreateFont();
132 font.FontHeightInPoints = 10;
133 font.Boldweight = 700;
134 headStyle.SetFont(font);
135
136
137 foreach (DataColumn column in dtSource.Columns)
138 {
139 headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
140 headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
141
142 //设置列宽
143 sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
144
145 }
146 headerRow.Dispose();
147 }
148 #endregion
149
150 rowIndex = 2;
151 }
152 #endregion
153
154
155 #region 填充内容
156 HSSFRow dataRow = sheet.CreateRow(rowIndex);
157 foreach (DataColumn column in dtSource.Columns)
158 {
159 HSSFCell newCell = dataRow.CreateCell(column.Ordinal);
160
161 string drValue = row[column].ToString();
162
163 switch (column.DataType.ToString())
164 {
165 case "System.String"://字符串类型
166 newCell.SetCellValue(drValue);
167 break;
168 case "System.DateTime"://日期类型
169 DateTime dateV;
170 DateTime.TryParse(drValue, out dateV);
171 newCell.SetCellValue(dateV);
172
173 newCell.CellStyle = dateStyle;//格式化显示
174 break;
175 case "System.Boolean"://布尔型
176 bool boolV = false;
177 bool.TryParse(drValue, out boolV);
178 newCell.SetCellValue(boolV);
179 break;
180 case "System.Int16"://整型
181 case "System.Int32":
182 case "System.Int64":
183 case "System.Byte":
184 int intV = 0;
185 int.TryParse(drValue, out intV);
186 newCell.SetCellValue(intV);
187 break;
188 case "System.Decimal"://浮点型
189 case "System.Double":
190 double doubV = 0;
191 double.TryParse(drValue, out doubV);
192 newCell.SetCellValue(doubV);
193 break;
194 case "System.DBNull"://空值处理
195 newCell.SetCellValue("");
196 break;
197 default:
198 newCell.SetCellValue("");
199 break;
200 }
201
202 }
203 #endregion
204
205 rowIndex++;
206 }
207
208
209 using (MemoryStream ms = new MemoryStream())
210 {
211 workbook.Write(ms);
212 ms.Flush();
213 ms.Position = 0;
214
215 sheet.Dispose();
216 //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
217 return ms;
218 }
219
220 }
221
222
223 /// <summary>
224 /// 用于Web导出
225 /// </summary>
226 /// <param name="dtSource">源DataTable</param>
227 /// <param name="strHeaderText">表头文本</param>
228 /// <param name="strFileName">文件名</param>
229 /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
230 public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
231 {
232
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 "p_w_upload;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
241
242 curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
243 curContext.Response.End();
244
245 }
246
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 }
2 using System.Collections.Generic;
3 using System.Data;
4 using System.IO;
5 using System.Text;
6 using System.Web;
7 using NPOI;
8 using NPOI.HPSF;
9 using NPOI.HSSF;
10 using NPOI.HSSF.UserModel;
11 using NPOI.HSSF.Util;
12 using NPOI.POIFS;
13 using NPOI.Util;
14
15
16 public class ExcelHelper
17 {
18 /// <summary>
19 /// DataTable导出到Excel文件
20 /// </summary>
21 /// <param name="dtSource">源DataTable</param>
22 /// <param name="strHeaderText">表头文本</param>
23 /// <param name="strFileName">保存位置</param>
24 /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
25 public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
26 {
27 using (MemoryStream ms = Export(dtSource, strHeaderText))
28 {
29 using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
30 {
31 byte[] data = ms.ToArray();
32 fs.Write(data, 0, data.Length);
33 fs.Flush();
34 }
35 }
36 }
37
38 /// <summary>
39 /// DataTable导出到Excel的MemoryStream
40 /// </summary>
41 /// <param name="dtSource">源DataTable</param>
42 /// <param name="strHeaderText">表头文本</param>
43 /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
44 public static MemoryStream Export(DataTable dtSource, string strHeaderText)
45 {
46 HSSFWorkbook workbook = new HSSFWorkbook();
47 HSSFSheet sheet = workbook.CreateSheet();
48
49 #region 右击文件 属性信息
50 {
51 DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
52 dsi.Company = "http://www.yongfa365.com/";
53 workbook.DocumentSummaryInformation = dsi;
54
55 SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
56 si.Author = "柳永法"; //填加xls文件作者信息
57 si.ApplicationName = "NPOI测试程序"; //填加xls文件创建程序信息
58 si.LastAuthor = "柳永法2"; //填加xls文件最后保存者信息
59 si.Comments = "说明信息"; //填加xls文件作者信息
60 si.Title = "NPOI测试"; //填加xls文件标题信息
61 si.Subject = "NPOI测试Demo";//填加文件主题信息
62 si.CreateDateTime = DateTime.Now;
63 workbook.SummaryInformation = si;
64 }
65 #endregion
66
67 HSSFCellStyle dateStyle = workbook.CreateCellStyle();
68 HSSFDataFormat format = workbook.CreateDataFormat();
69 dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
70
71 //取得列宽
72 int[] arrColWidth = new int[dtSource.Columns.Count];
73 foreach (DataColumn item in dtSource.Columns)
74 {
75 arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
76 }
77 for (int i = 0; i < dtSource.Rows.Count; i++)
78 {
79 for (int j = 0; j < dtSource.Columns.Count; j++)
80 {
81 int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
82 if (intTemp > arrColWidth[j])
83 {
84 arrColWidth[j] = intTemp;
85 }
86 }
87 }
88
89
90
91 int rowIndex = 0;
92
93 foreach (DataRow row in dtSource.Rows)
94 {
95 #region 新建表，填充表头，填充列头，样式
96 if (rowIndex == 65535 || rowIndex == 0)
97 {
98 if (rowIndex != 0)
99 {
100 sheet = workbook.CreateSheet();
101 }
102
103 #region 表头及样式
104 {
105 HSSFRow headerRow = sheet.CreateRow(0);
106 headerRow.HeightInPoints = 25;
107 headerRow.CreateCell(0).SetCellValue(strHeaderText);
108
109 HSSFCellStyle headStyle = workbook.CreateCellStyle();
110 headStyle.Alignment = CellHorizontalAlignment.CENTER;
111 HSSFFont font = workbook.CreateFont();
112 font.FontHeightInPoints = 20;
113 font.Boldweight = 700;
114 headStyle.SetFont(font);
115
116 headerRow.GetCell(0).CellStyle = headStyle;
117
118 sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
119 headerRow.Dispose();
120 }
121 #endregion
122
123
124 #region 列头及样式
125 {
126 HSSFRow headerRow = sheet.CreateRow(1);
127
128
129 HSSFCellStyle headStyle = workbook.CreateCellStyle();
130 headStyle.Alignment = CellHorizontalAlignment.CENTER;
131 HSSFFont font = workbook.CreateFont();
132 font.FontHeightInPoints = 10;
133 font.Boldweight = 700;
134 headStyle.SetFont(font);
135
136
137 foreach (DataColumn column in dtSource.Columns)
138 {
139 headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
140 headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
141
142 //设置列宽
143 sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
144
145 }
146 headerRow.Dispose();
147 }
148 #endregion
149
150 rowIndex = 2;
151 }
152 #endregion
153
154
155 #region 填充内容
156 HSSFRow dataRow = sheet.CreateRow(rowIndex);
157 foreach (DataColumn column in dtSource.Columns)
158 {
159 HSSFCell newCell = dataRow.CreateCell(column.Ordinal);
160
161 string drValue = row[column].ToString();
162
163 switch (column.DataType.ToString())
164 {
165 case "System.String"://字符串类型
166 newCell.SetCellValue(drValue);
167 break;
168 case "System.DateTime"://日期类型
169 DateTime dateV;
170 DateTime.TryParse(drValue, out dateV);
171 newCell.SetCellValue(dateV);
172
173 newCell.CellStyle = dateStyle;//格式化显示
174 break;
175 case "System.Boolean"://布尔型
176 bool boolV = false;
177 bool.TryParse(drValue, out boolV);
178 newCell.SetCellValue(boolV);
179 break;
180 case "System.Int16"://整型
181 case "System.Int32":
182 case "System.Int64":
183 case "System.Byte":
184 int intV = 0;
185 int.TryParse(drValue, out intV);
186 newCell.SetCellValue(intV);
187 break;
188 case "System.Decimal"://浮点型
189 case "System.Double":
190 double doubV = 0;
191 double.TryParse(drValue, out doubV);
192 newCell.SetCellValue(doubV);
193 break;
194 case "System.DBNull"://空值处理
195 newCell.SetCellValue("");
196 break;
197 default:
198 newCell.SetCellValue("");
199 break;
200 }
201
202 }
203 #endregion
204
205 rowIndex++;
206 }
207
208
209 using (MemoryStream ms = new MemoryStream())
210 {
211 workbook.Write(ms);
212 ms.Flush();
213 ms.Position = 0;
214
215 sheet.Dispose();
216 //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
217 return ms;
218 }
219
220 }
221
222
223 /// <summary>
224 /// 用于Web导出
225 /// </summary>
226 /// <param name="dtSource">源DataTable</param>
227 /// <param name="strHeaderText">表头文本</param>
228 /// <param name="strFileName">文件名</param>
229 /// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
230 public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
231 {
232
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 "p_w_upload;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
241
242 curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
243 curContext.Response.End();
244
245 }
246
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 }
参考地址:NPOI导出Excel表功能实现(多个工作簿)：http://www.cnblogs.com/zhengjuzhuan/archive/2010/02/01/1661103.html
在 Server 端存取 Excel 檔案的利器：NPOI Library：http://msdn.microsoft.com/zh-tw/ee818993.aspx
ASP.NET使用NPOI类库导出Excel：http://www.cnblogs.com/niunan/archive/2010/03/30/1700706.html
总结通过以上分析，我们不难发现，用NPOI或MyXls代替是Excel是很明智的，在发文前，我看到NPOI及MyXls仍然在活跃的更新中。在使用过程中发现这两个组件极相似，以前看过文章说他们使用的内核是一样的。还有NPOI是国人开发的，且有相关中文文档，在很多地方有相关引用，下载量也很大。并且它支持Excel，看到MyXls相关问题基本上没人回答，所以推荐使用NPOI。MyXls可以直接Cell.Font.Bold操作，而NPOI得使用CellType多少感觉有点麻烦。
