1、NPOI官方网站：http://npoi.codeplex.com/
NPOI组件版本
2、NPOI在线学习教程（中文版）：
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
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
=
new
int
[dtSource.Columns.Count];
77
foreach
(DataColumn item
in
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 row
in
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 column
in
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 column
in
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,
string
strFileName)
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
标签: NPOI
