using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.IO; using NPOI.HSSF.UserModel; using NPOI.HPSF; using NPOI.POIFS.FileSystem; using NPOI.SS.UserModel; using NPOI.SS.Util; using System.Web;

namespace Ninesky.Common.Util {     public class NpoiUtil     {         /// <summary>         /// DataTable导出到Excel文件         /// </summary>         /// <param name="dtSource">源DataTable</param>         /// <param name="strHeaderText">表头文本</param>         /// <param name="strFileName">保存位置</param>         public static void Export(DataTable dtSource, string strHeaderText, string strFileName)         {             using (MemoryStream ms = Export(dtSource, strHeaderText))             {                 using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))                 {                     byte[] data = ms.ToArray();                     fs.Write(data, 0, data.Length);                     fs.Flush();                 }             }         }

/// <summary>         /// DataTable导出到Excel的MemoryStream         /// </summary>         /// <param name="dtSource">源DataTable</param>         /// <param name="strHeaderText">表头文本</param>         public static MemoryStream Export(DataTable dtSource, string strHeaderText)         {             HSSFWorkbook workbook = new HSSFWorkbook();             ISheet sheet = workbook.CreateSheet("Sheet1");

#region 右击文件 属性信息

{                 DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();                 dsi.Company = "Company";                 workbook.DocumentSummaryInformation = dsi;

SummaryInformation si = PropertySetFactory.CreateSummaryInformation();                 si.Author = "Author"; //填加xls文件作者信息

si.ApplicationName = "ApplicationName"; //填加xls文件创建程序信息                 si.LastAuthor = "LastAuthor"; //填加xls文件最后保存者信息

si.Comments = "Comments"; //填加xls文件作者信息

si.Title = "Title"; //填加xls文件标题信息                 si.Subject = "Subject";//填加文件主题信息                 si.CreateDateTime = DateTime.Now;                 workbook.SummaryInformation = si;             }             #endregion

ICellStyle dateStyle = workbook.CreateCellStyle();             IDataFormat format = workbook.CreateDataFormat();             dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

//取得列宽             int[] arrColWidth = new int[dtSource.Columns.Count];             foreach (DataColumn item in dtSource.Columns)             {                 arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;             }

for (int i = 0; i < dtSource.Rows.Count; i++)             {                 for (int j = 0; j < dtSource.Columns.Count; j++)                 {                     int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;                     if (intTemp > arrColWidth[j])                     {                         arrColWidth[j] = intTemp;                     }                 }             }             int rowIndex = 0;             foreach (DataRow row in dtSource.Rows)             {                 #region 新建表，填充表头，填充列头，样式                 if (rowIndex == 65535 || rowIndex == 0)                 {                     if (rowIndex != 0)                     {                         sheet = workbook.CreateSheet();                     }

#region 表头及样式

{                         IRow headerRow = sheet.CreateRow(0);                         headerRow.HeightInPoints = 25;                         headerRow.CreateCell(0).SetCellValue(strHeaderText);

ICellStyle headStyle = workbook.CreateCellStyle();                         headStyle.Alignment = HorizontalAlignment.CENTER;                         IFont font = workbook.CreateFont();                         font.FontHeightInPoints = 20;                         font.Boldweight = 700;                         headStyle.SetFont(font);                         headerRow.GetCell(0).CellStyle = headStyle;                         sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));                         //headerRow.Dispose();                     }                     #endregion

#region 列头及样式

{                         IRow headerRow = sheet.CreateRow(1);                         ICellStyle headStyle = workbook.CreateCellStyle();                         headStyle.Alignment = HorizontalAlignment.CENTER;                         IFont font = workbook.CreateFont();                         font.FontHeightInPoints = 10;                         font.Boldweight = 700;                         headStyle.SetFont(font);                         foreach (DataColumn column in dtSource.Columns)                         {                             headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);                             headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

//设置列宽                             sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);                         }                         //headerRow.Dispose();                     }                     #endregion

rowIndex = 2;                 }                 #endregion

#region 填充内容                 IRow dataRow = sheet.CreateRow(rowIndex);                 foreach (DataColumn column in dtSource.Columns)                 {                     ICell newCell = dataRow.CreateCell(column.Ordinal);

string drValue = row[column].ToString();

switch (column.DataType.ToString())                     {                         case "System.String"://字符串类型

newCell.SetCellValue(drValue);                             break;                         case "System.DateTime"://日期类型                             DateTime dateV;                             DateTime.TryParse(drValue, out dateV);                             newCell.SetCellValue(dateV);

newCell.CellStyle = dateStyle;//格式化显示

break;                         case "System.Boolean"://布尔型

bool boolV = false;                             bool.TryParse(drValue, out boolV);                             newCell.SetCellValue(boolV);                             break;                         case "System.Int16"://整型                         case "System.Int32":                         case "System.Int64":                         case "System.Byte":                             int intV = 0;                             int.TryParse(drValue, out intV);                             newCell.SetCellValue(intV);                             break;                         case "System.Decimal"://浮点型

case "System.Double":                             double doubV = 0;                             double.TryParse(drValue, out doubV);                             newCell.SetCellValue(doubV);                             break;                         case "System.DBNull"://空值处理

newCell.SetCellValue("");                             break;                         default:                             newCell.SetCellValue("");                             break;                     }

}                 #endregion

rowIndex++;             }             using (MemoryStream ms = new MemoryStream())             {                 workbook.Write(ms);                 ms.Flush();                 ms.Position = 0;

//sheet.Dispose();                 //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                 return ms;             }         }

/// <summary>         /// 用于Web导出         /// </summary>         /// <param name="dtSource">源DataTable</param>         /// <param name="strHeaderText">表头文本</param>         /// <param name="strFileName">文件名</param>         public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)         {             HttpContext curContext = HttpContext.Current;

// 设置编码和附件格式

curContext.Response.ContentType = "application/vnd.ms-excel";             curContext.Response.ContentEncoding = Encoding.UTF8;             curContext.Response.Charset = "";             curContext.Response.AppendHeader("Content-Disposition",                 "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));

curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());             curContext.Response.End();         }

/// <summary>读取excel         /// 默认第一行为标头         /// </summary>         /// <param name="strFileName">excel文档路径</param>         /// <returns></returns>         public static DataTable Import(string strFileName)         {             DataTable dt = new DataTable();

HSSFWorkbook hssfworkbook;             using (FileStream file = new FileStream(strFileName, 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;         }     } }