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云代码 - c#代码库

NPOI导出与读取Excel

2014-03-11 作者： 使徒举报

[c#]代码库

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using System;
 
 
using System.Collections.Generic;
 
using System.Linq;
 
using System.Text;
 
using System.Data;
 
using System.IO;
 
using NPOI;
 
using NPOI.HPSF;
 
using NPOI.HSSF;
 
using NPOI.HSSF.UserModel;
 
using NPOI.HSSF.Util;
 
using NPOI.POIFS;
 
using NPOI.Util; 
 
 
 
 
namespace ConsoleApplication2
 
{
 
    internal class Program
 
    {
 
        private static void Main(string[] args)
 
        {
 
            DataTable newdtb = new DataTable();
 
            newdtb.Columns.Add("Id", typeof (int));
 
            newdtb.Columns.Add("ProName", typeof (string));
 
            newdtb.Columns.Add("ProPrice", typeof (decimal));
 
            newdtb.Columns["Id"].AutoIncrement = true;
 
 
 
 
            for (int i = 1; i < 11; i++)
 
            {
 
                DataRow newRow = newdtb.NewRow();
 
                newRow["ProCardNo"] = "12312345612543256" + i.ToString();
 
                newRow["ProPrice"] = 12.3m;
 
                newdtb.Rows.Add(newRow);
 
            }
 
            DataTable dt = newdtb;
 
             
 
 
                Export(dt, "aaa", "d:\\222.xls");
 
 
 
 
        }
 
 
 
 
 
        #region  NPOI导出到Excel
 
 
 
 
        /// <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();
 
            HSSFSheet sheet = workbook.CreateSheet();
 
 
 
            #region 右击文件 属性信息
 
 
            {
 
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
 
                dsi.Company = "NPOI";
 
                workbook.DocumentSummaryInformation = dsi;
 
 
                SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
 
                si.Author = "文件作者信息"; //填加xls文件作者信息
 
                si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
 
                si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
 
                si.Comments = "作者信息"; //填加xls文件作者信息
 
                si.Title = "标题信息"; //填加xls文件标题信息
 
                si.Subject = "主题信息"; //填加文件主题信息
 
                si.CreateDateTime = DateTime.Now;
 
                workbook.SummaryInformation = si;
 
            }
 
 
            #endregion
 
 
            HSSFCellStyle dateStyle = workbook.CreateCellStyle();
 
            HSSFDataFormat 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
 
                    {
 
                        HSSFRow headerRow = sheet.CreateRow(0);
 
                        headerRow.HeightInPoints = 25;
 
                        headerRow.CreateCell(0).SetCellValue(strHeaderText);
 
 
 
 
                        HSSFCellStyle headStyle = workbook.CreateCellStyle();
 
                        headStyle.Alignment = CellHorizontalAlignment.CENTER;
 
                        HSSFFont font = workbook.CreateFont();
 
                        font.FontHeightInPoints = 20;
 
                        font.Boldweight = 700;
 
                        headStyle.SetFont(font);
 
                        headerRow.GetCell(0).CellStyle = headStyle;
 
                        sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
 
                        headerRow.Dispose();
 
                    }
 
 
 
 
                    #endregion
 
 
 
 
 
 
 
                    #region 列头及样式
 
 
 
 
                    {
 
                        HSSFRow headerRow = sheet.CreateRow(1);
 
                        HSSFCellStyle headStyle = workbook.CreateCellStyle();
 
                        headStyle.Alignment = CellHorizontalAlignment.CENTER;
 
                        HSSFFont 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
 
 
 
 
                HSSFRow dataRow = sheet.CreateRow(rowIndex);
 
                foreach (DataColumn column in dtSource.Columns)
 
                {
 
                    HSSFCell 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;
 
            }
 
        }
 
 
 
 
        #endregion
 
 
 
 
        #region  Excl读取
 
        /// <summary>
 
        /// 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);
 
            }
 
            HSSFSheet sheet = hssfworkbook.GetSheetAt(0);
 
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
 
 
 
 
            HSSFRow headerRow = sheet.GetRow(0);
 
            int cellCount = headerRow.LastCellNum;
 
 
 
 
            for (int j = 0; j < cellCount; j++)
 
            {
 
                HSSFCell cell = headerRow.GetCell(j);
 
                dt.Columns.Add(cell.ToString());
 
            }
 
 
 
 
            for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
 
            {
 
                HSSFRow 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
 
    }
 
}


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