我要评论什么是npoi
该项目是位于http://poi.apache.org/的poi java项目的.net版本。poi是一个开源项目，可以帮助您读取/写入xls，doc，ppt文件。它有着广泛的应用。本文给大家介绍asp.net mvc利用npoi导入导出excel的问题。
因近期项目遇到所以记录一下：
首先导出excel：
首先引用npoi包
（action一定要用fileresult）
/// <summary>
/// 批量导出本校第一批派位学生
/// </summary>
/// <returns></returns>
public fileresult exportstu2()
{
string schoolname = "401";
//创建excel文件的对象
npoi.hssf.usermodel.hssfworkbook book = new npoi.hssf.usermodel.hssfworkbook();
//添加一个sheet
npoi.ss.usermodel.isheet sheet1 = book.createsheet("sheet1");
//获取list数据
list<tb_studentinfomodel> listraininfo = m_bll.getschoollistaatq(schoolname);
//给sheet1添加第一行的头部标题
npoi.ss.usermodel.irow row1 = sheet1.createrow(0);
row1.createcell(0).setcellvalue("电脑号");
row1.createcell(1).setcellvalue("姓名");
//将数据逐步写入sheet1各个行
for (int i = 0; i < listraininfo.count; i++)
{
npoi.ss.usermodel.irow rowtemp = sheet1.createrow(i + 1);
rowtemp.createcell(0).setcellvalue(listraininfo[i].st_code.tostring());
rowtemp.createcell(1).setcellvalue(listraininfo[i].st_name.tostring());
}
// 写入到客户端
system.io.memorystream ms = new system.io.memorystream();
book.write(ms);
ms.seek(0, seekorigin.begin);
return file(ms, "application/vnd.ms-excel", "第一批电脑派位生名册.xls");
}前台直接写就可实现：
@html.actionlink("点击导出名册", "exportstu2")下面说一下导入：
首先说一些前台吧，mvc上传注意必须加new { enctype = "multipart/form-data" }：
<td>
2、@using(@html.beginform("importstu", "proschool", formmethod.post, new { enctype = "multipart/form-data" }))
{
<text>选择上传文件：（工作表名为“sheet1”，“电脑号”在a1单元格。）</text>
<input name="file" type="file" id="file" />
<input type="submit" name="upload" value="批量导入第一批电脑派位名册" />
}
</td>后台实现：只传路径得出datatable：
/// <summary>
/// excel导入
/// </summary>
/// <param name="filepath"></param>
/// <returns></returns>
public datatable importexcelfile(string filepath)
{
hssfworkbook hssfworkbook;
#region//初始化信息
try
{
using (filestream file = new filestream(filepath, filemode.open, fileaccess.read))
{
hssfworkbook = new hssfworkbook(file);
}
}
catch (exception e)
{
throw e;
}
#endregion
using (npoi.ss.usermodel.isheet sheet = hssfworkbook.getsheetat(0))
{
datatable table = new datatable();
irow headerrow = sheet.getrow(0);//第一行为标题行
int cellcount = headerrow.lastcellnum;//lastcellnum = physicalnumberofcells
int rowcount = sheet.lastrownum;//lastrownum = physicalnumberofrows - 1
//handling header.
for (int i = headerrow.firstcellnum; i < cellcount; i++)
{
datacolumn column = new datacolumn(headerrow.getcell(i).stringcellvalue);
table.columns.add(column);
}
for (int i = (sheet.firstrownum + 1); i <= rowcount; i++)
{
irow row = sheet.getrow(i);
datarow datarow = table.newrow();
if (row != null)
{
for (int j = row.firstcellnum; j < cellcount; j++)
{
if (row.getcell(j) != null)
datarow[j] = getcellvalue(row.getcell(j));
}
}
table.rows.add(datarow);
}
return table;
}
}补充一个类
/// <summary>
/// 根据excel列类型获取列的值
/// </summary>
/// <param name="cell">excel列</param>
/// <returns></returns>
private static string getcellvalue(icell cell)
{
if (cell == null)
return string.empty;
switch (cell.celltype)
{
case celltype.blank:
return string.empty;
case celltype.boolean:
return cell.booleancellvalue.tostring();
case celltype.error:
return cell.errorcellvalue.tostring();
case celltype.numeric:
case celltype.unknown:
default:
return cell.tostring();//this is a trick to get the correct value of the cell. numericcellvalue will return a numeric value no matter the cell value is a date or a number
case celltype.string:
return cell.stringcellvalue;
case celltype.formula:
try
{
hssfformulaevaluator e = new hssfformulaevaluator(cell.sheet.workbook);
e.evaluateincell(cell);
return cell.tostring();
}
catch
{
return cell.numericcellvalue.tostring();
}
}
}得到datatable后，就想怎么操作就怎么操作了
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