NPOI可以在没有安装Office的情况下对Word或Excel文档进行读写操作
下面介绍下NPOI操作Excel的方法
首先我们需要下载NPOI的程序集
下载地址 http://npoi.codeplex.com/releases
我下载下来是有这两个文件
这里使用的是net4.0
将下面几个dll添加到项目中并引用
废话不多说 上代码
/// <summary>
/// create 2016-11-30 by sly
/// 将DataTable数据导入到excel中 此方法直接返回文件给浏览器下载
/// </summary>
/// <param name="data">要导入的数据</param>
/// <param name="isColumnWritten">DataTable的列名是否要导入</param>
/// <param name="sheetName">要导入的excel的sheet的名称</param>
/// <param name="widthDic">要设置的宽度(key 列下标,val 宽度大小)</param>
/// <returns></returns>
public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten, Dictionary<int, int> widthDic = null)
{
int i = 0;
int j = 0;
int count = 0;
ISheet sheet = null;
MemoryStream file = new MemoryStream();
if (fileName.IndexOf(".xlsx") > 0) //2007版本
workbook = new XSSFWorkbook();
else
if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook();
try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
//设置所有列宽
for (int l = 0; l <= data.Rows.Count; l++)
{
sheet.DefaultColumnWidth = 12;
}
if (widthDic != null)
{
//设定自定义宽度
foreach (var item in widthDic)
{
sheet.SetColumnWidth(item.Key, item.Value);
}
}
}
else
{
return -1;
}
if (isColumnWritten == true) //写入DataTable的列名
{
IRow row = sheet.CreateRow(0);
for (j = 0; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = 1;
}
else
{
count = 0;
}
int outRes = -1;
for (i = 0; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = 0; j < data.Columns.Count; ++j)
{
if (int.TryParse(data.Rows[i][j].ToString(), out outRes))
{
row.CreateCell(j).SetCellValue(Convert.ToInt32(data.Rows[i][j].ToString()));
}
else
{
if (!string.IsNullOrEmpty(data.Rows[i][j].ToString()) && data.Rows[i][j].ToString().Length > 10)
{
if ((data.Rows[i][j].ToString().Substring(0, 7) == "http://" || data.Rows[i][j].ToString().Substring(0, 8) == "https://"))
{
var TCell = row.CreateCell(j);
HSSFHyperlink link = new HSSFHyperlink(HyperlinkType.Url);//建一个HSSFHyperlink实体，指明链接类型为URL
TCell.SetCellValue(data.Rows[i][j].ToString());
link.Address = data.Rows[i][j].ToString();//给HSSFHyperlink的地址赋值
TCell.Hyperlink = link;
}
else
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
}
else
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
}
}
++count;
}
workbook.Write(file); //写入到excel
var context = System.Web.HttpContext.Current;
context.Response.ContentType = "application/vnd.ms-excel";
context.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", fileName));
context.Response.Clear();
context.Response.BinaryWrite(file.GetBuffer());
context.Response.End();
return count;
}
catch (Exception ex)
{
return -2;
}
}
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns></returns>
public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
{
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook(fs);
else
if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook(fs);
if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
{
sheet = workbook.GetSheetAt(0);
}
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null
DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
}
return data;
}
catch (Exception ex)
{
return null;
}
}
/// <summary>
/// 合并单元格
/// </summary>
/// <param name="sheet">要合并单元格所在的sheet</param>
/// <param name="rowstart">开始行的索引</param>
/// <param name="rowend">结束行的索引</param>
/// <param name="colstart">开始列的索引</param>
/// <param name="colend">结束列的索引</param>
public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend)
{
CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
sheet.AddMergedRegion(cellRangeAddress);
}
//调用导出方法
new Helper.ExcelHelper("导出的文件名.xls").DataTableToExcel(dt, "sheet1", true, null);
new Helper.ExcelHelper("导出的文件名.xlsx").DataTableToExcel(dt, "sheet1", true, null);
下面是导入
<input type="file" name="fileField" class="file" id="fileField" value="导入" style="display: none;" />
<script>
$("#fileField").live("change", function () {
var Reg = new RegExp("^.+.(xls)");
var Reg2 = new RegExp("^.+.(xlsx)");
if (Reg.test($(this).val()) || Reg.test2($(this).val())) {
ImportGrade();//此处调用后台导入方法，这里就不写了哈
} else {
$.IvanDialogOpen({ "Type": "tips", "Info": "仅支持 .xls ，.xlsx 文件", "Plugins": { CloseTime: 800 } });
}
})
</script>
/// <summary>
/// 导入Demo
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public ActionResult ImportGrade(string filePath)
{
//获取文件在服务器上的路径
string path = string.Concat(FileUpload.GetFilePath(UploadType.ImportGradeFile), filePath);
//根据上传路径获取表格数据
ExcelHelper eh = new ExcelHelper(path.Replace("\", "/"));
DataTable dt = eh.ExcelToDataTable("Sheet1", true);
return Content("");
}
以上就是NPOI的简单使用方法