Excel导入导出帮助类
/// <summary>
/// Excel导入导出帮助类
/// 记得引入 NPOI
/// 下载地址 http://npoi.codeplex.com/releases/
/// </summary>
public class ExcelHelper
{
#region 导出Excel
/// <summary>
/// 导出Excel 注：model 字段必须加[DisplayName("XXX")]不要导出的标为[DisplayName("null")]，并且不要导出的字段放在最后，要导出的放前面
/// </summary>
/// <param name="p_List">数据集合</param>
/// <param name="p_Title">Excel路径</param>
/// <param name="ColumnsCount">总列数</param>
public void ToExcel<T>(List<T> p_List, string p_Title, int ColumnsCount)
{
if (p_List == null || p_List.Count <= 0 || ColumnsCount <= 0)
{
return;
}
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
if (properties.Count <= 0)
{
return;
}
StringBuilder ExcelInfo = new StringBuilder();
string sign = string.Empty;
string DisplayName = string.Empty;
//写表头
for (int i = 0; i < ColumnsCount; i++)
{
DisplayName = properties[i].DisplayName;
if (!string.IsNullOrEmpty(DisplayName) && DisplayName != "null" && DisplayName != "Id")
{
sign = i == ColumnsCount - 1 ? "\n" : "\t";
ExcelInfo.AppendFormat("{0}{1}", DisplayName, sign);
}
}
//写表内容
for (int i = 0; i < p_List.Count; i++)
{
for (int j = 0; j < ColumnsCount; j++)
{
DisplayName = properties[j].DisplayName;
if (!string.IsNullOrEmpty(DisplayName) && DisplayName != "null" && DisplayName != "Id")
{
sign = j == ColumnsCount - 1 ? "\n" : "\t";
object obj = properties[j].GetValue(p_List[i]);
obj = obj == null ? string.Empty : obj.ToString();
ExcelInfo.AppendFormat("{0}{1}", obj, sign);
}
}
}
HttpResponse p_Response = HttpContext.Current.Response;
p_Response.Clear();
p_Response.ClearContent();
p_Response.Buffer = true;
//设置Http的头信息,编码格式
p_Response.AppendHeader("Content-Disposition", "attachment;filename=" + p_Title + ".xls");
p_Response.ContentType = "application/ms-excel";
//设置编码
p_Response.Charset = "gb2312";
p_Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
p_Response.Write(ExcelInfo);
p_Response.Flush();
p_Response.Close();
p_Response.End();
}
#endregion
#region 导入Excel数据
/// <summary>
/// OleDB连接Excel文件 --> DataSet
/// </summary>
/// <param name="xlsFilePath">.xls文件路径</param>
/// <returns></returns>
public static DataSet XlsToDataSet(string xlsFilePath)
{
OleDbConnection oleDBConn = new OleDbConnection();
OleDbDataAdapter oleAdMaster = new OleDbDataAdapter();
DataSet ds = new DataSet();
try
{
FileInfo file = new FileInfo(xlsFilePath);
if (!file.Exists)
{
throw new Exception("文件不存在。");
}
string extension = file.Extension.ToLower();
StringBuilder oleDBConnStr = new StringBuilder();
switch (extension)
{
case ".xls":
oleDBConnStr.AppendFormat("Provider=Microsoft.Jet.Oledb.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=NO;IMEX=1';", xlsFilePath);//此连接只能操作Excel2007之前(.xls)文件
//备注： "HDR=yes;"是说Excel文件的第一行是列名而不是数据，"HDR=No;"正好与前面的相反。
// "IMEX=1 "如果列中的数据类型不一致，使用"IMEX=1"可必免数据类型冲突。
break;
case ".xlsx":
oleDBConnStr.AppendFormat("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0;HDR=Yes;IMEX=1';", xlsFilePath);
break;
default:
oleDBConnStr.AppendFormat("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;HDR=YES;IMEX=1;", xlsFilePath);
break;
}
oleDBConn = new OleDbConnection(oleDBConnStr.ToString());
oleDBConn.Open();
DataTable tableStructure = oleDBConn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
if (tableStructure != null && tableStructure.Rows.Count > 0)
{
tableStructure.TableName = tableStructure.Rows[0]["TABLE_NAME"].ToString();
StringBuilder sqlStr = new StringBuilder();
sqlStr.AppendFormat("select * from [{0}]", tableStructure.TableName);
oleAdMaster = new OleDbDataAdapter(sqlStr.ToString(), oleDBConn);
oleAdMaster.Fill(ds, "m_tableName");
if (ds.Tables["m_tableName"].Rows.Count <= 0)
{
throw new Exception("excel文件中没有有客户数据,请录入数据。");
}
}
else
{
throw new Exception("未能找到该上传的excel文件。");
}
}
finally
{
oleAdMaster.Dispose();
oleDBConn.Close();
oleDBConn.Dispose();
}
return ds;
}
#endregion
#region NPOI 导出Excel
private const Int32 MaxRowPerSheet = 65535;
private Int32 rowPerSheet = 1000;
public Int32 RowPerSheet
{
get { return rowPerSheet; }
set
{
if (value < 0 || value > MaxRowPerSheet)
{
throw new ArgumentOutOfRangeException("RowPerSheet");
}
else
{
rowPerSheet = value;
}
}
}
HSSFWorkbook hssfworkbook;
public void Export<T>(IList<T> records)
{
if (records.Count == 0)
throw new ArgumentNullException("无导出数据。");
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
int ColumnsCount = properties.Count;
PropertyInfo[] props = new PropertyInfo[ColumnsCount];
string DisplayName = string.Empty;
for (int i = 0; i < ColumnsCount; i++)
{
DisplayName = properties[i].DisplayName;
if (!string.IsNullOrEmpty(DisplayName) && DisplayName != "null" && DisplayName != "Id")
{
props[i] = typeof(T).GetProperty(properties[i].Name); //注意属性数组仍然可以有元素为null
}
}
ISheet sheet = null;
IRow row = null;
for (int r = 0; r < records.Count; r++)
{
if ((r % RowPerSheet) == 0)
{
Int32 sheetIndex = (Int32)((Double)r / RowPerSheet) + 1;
sheet = hssfworkbook.CreateSheet("Sheet" + sheetIndex);
row = sheet.CreateRow(0);
for (int i = 0; i < ColumnsCount; i++)
{
DisplayName = properties[i].DisplayName;
if (!string.IsNullOrEmpty(DisplayName) && DisplayName != "null" && DisplayName != "Id")
{
row.CreateCell(i).SetCellValue(properties[i].DisplayName);
}
}
Console.WriteLine();
}
//注意CreateRow(Int32 rownum)中参数rownum虽然从第0行开始，但因为表头存在，每次得往下一行
row = sheet.CreateRow(r % RowPerSheet + 1);
for (int i = 0; i < props.Length; i++)
{
if (props[i] != null) //注意null检查
{
Object value = props[i].GetValue(records[r], null);
if (value != null)
{
row.CreateCell(i).SetCellValue(value.ToString());
}
}
}
}
for (Int32 i = 0; i < hssfworkbook.NumberOfSheets; i++)
{
sheet = hssfworkbook.GetSheetAt(i);
for (Int32 h = 0; h < ColumnsCount; h++)
{
sheet.AutoSizeColumn(h); //每列宽度自适应
}
}
}
/// <summary>
/// 导出Excel
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="records">数据</param>
/// <param name="filename">Excel名称</param>
public void SaveToExcel<T>(IList<T> records, string fileName)
{
RowPerSheet = 100;
string userAgent = HttpContext.Current.Request.ServerVariables["http_user_agent"].ToLower();
if (userAgent.IndexOf("firefox") == -1)//判断是否是火狐浏览器
fileName = HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8);
HttpResponse p_Response = HttpContext.Current.Response;
p_Response.ContentType = "application/vnd.ms-excel";
p_Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", fileName));
p_Response.Clear();
InitializeWorkbook();
Export<T>(records);
GetExcelStream().WriteTo(p_Response.OutputStream);
p_Response.End();
}
MemoryStream GetExcelStream()
{
//Write the stream data of workbook to the root directory
MemoryStream file = new MemoryStream();
hssfworkbook.Write(file);
return file;
}
void InitializeWorkbook()
{
hssfworkbook = new HSSFWorkbook();
////create a entry of DocumentSummaryInformation
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
// dsi.Company = "NPOI Team";
hssfworkbook.DocumentSummaryInformation = dsi;
////create a entry of SummaryInformation
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
// si.Subject = "NPOI SDK Example";
hssfworkbook.SummaryInformation = si;
}
#endregion
#region NPOI 导入Excel
/// <summary>
/// Excel转换DataTable
/// </summary>
/// <param name="FilePath">文件的绝对路径</param>
/// <returns>DataTable</returns>
public static DataTable ExcelInput(string FilePath)
{
DataTable dt = new DataTable();
HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(FilePath, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
ISheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
IRow headerRow = sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
ICell cell = headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = dt.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
dt.Rows.Add(dataRow);
}
return dt;
}
#endregion
}
