NPOI.dll 用法：单元格、样式、字体、颜色、行高、宽度 读写excel

1.25 NPOI.dll
 
using System;
 
 
using System.Collections.Generic;
 
using System.ComponentModel;
 
using System.Data;
 
using System.Drawing;
 
using System.Linq;
 
using System.Text;
 
using System.Windows.Forms;
 
using System.Data.SqlClient;
 
using NPOI.HSSF.UserModel;
 
using NPOI.HPSF;
 
using NPOI.POIFS.FileSystem;
 
using NPOI.HSSF.Util;
 
using NPOI.SS.UserModel;
 
using System.IO;
 
using SqlHelPerXHC;
 
using NPOI.HSSF.Record.CF;
 
namespace Excl
 
{
 
    public partial class Form1 : Form
 
    {
 
        //http://tonyqus.sinaapp.com/page/4  官网使用说明
 
        public Form1()
 
        {
 
            InitializeComponent();
 
        }
 
        #region 定义单元格常用到样式的枚举
 
        public enum stylexls
 
        {
 
            头,
 
            url,
 
            时间,
 
            数字,
 
            钱,
 
            百分比,
 
            中文大写,
 
            科学计数法,
 
            默认
 
        }
 
        #endregion
 
 
 
 
 
 
 
        #region 定义单元格常用到样式
 
        static ICellStyle Getcellstyle(IWorkbook wb, stylexls str)
 
        {
 
            ICellStyle cellStyle = wb.CreateCellStyle();
 
 
 
 
            //定义几种字体
 
            //也可以一种字体，写一些公共属性，然后在下面需要时加特殊的
 
            IFont font12 = wb.CreateFont();
 
            font12.FontHeightInPoints = 10;
 
            font12.FontName = "微软雅黑";
 
 
 
 
             
 
            IFont font = wb.CreateFont();
 
            font.FontName = "微软雅黑";
 
            //font.Underline = 1;下划线
 
 
 
 
 
 
 
            IFont fontcolorblue = wb.CreateFont();
 
            fontcolorblue.Color = HSSFColor.OLIVE_GREEN.BLUE.index;
 
            fontcolorblue.IsItalic = true;//下划线
 
            fontcolorblue.FontName = "微软雅黑";
 
 
 
 
 
 
 
            //边框
 
            cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.DOTTED;
 
            cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.HAIR;
 
            cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.HAIR;
 
            cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.DOTTED;
 
            //边框颜色
 
            cellStyle.BottomBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;
 
            cellStyle.TopBorderColor = HSSFColor.OLIVE_GREEN.BLUE.index;
 
 
 
 
            //背景图形，我没有用到过。感觉很丑
 
            //cellStyle.FillBackgroundColor = HSSFColor.OLIVE_GREEN.BLUE.index;
 
            //cellStyle.FillForegroundColor = HSSFColor.OLIVE_GREEN.BLUE.index;
 
            cellStyle.FillForegroundColor = HSSFColor.WHITE.index;
 
            // cellStyle.FillPattern = FillPatternType.NO_FILL;
 
            cellStyle.FillBackgroundColor = HSSFColor.MAROON.index;
 
             
 
            //水平对齐
 
            cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.LEFT;
 
 
 
 
            //垂直对齐
 
            cellStyle.VerticalAlignment = VerticalAlignment.CENTER;
 
 
 
 
            //自动换行
 
            cellStyle.WrapText = true;
 
 
 
 
            //缩进;当设置为1时，前面留的空白太大了。希旺官网改进。或者是我设置的不对
 
            cellStyle.Indention = 0;
 
 
 
 
            //上面基本都是设共公的设置
 
            //下面列出了常用的字段类型
 
            switch (str)
 
            {
 
                case stylexls.头:
 
                    // cellStyle.FillPattern = FillPatternType.LEAST_DOTS;
 
                    cellStyle.SetFont(font12);
 
                    break;
 
                case stylexls.时间:
 
                    IDataFormat datastyle = wb.CreateDataFormat();
 
 
 
 
                    cellStyle.DataFormat = datastyle.GetFormat("yyyy/mm/dd");
 
                    cellStyle.SetFont(font);
 
                    break;
 
                case stylexls.数字:
 
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00");
 
                    cellStyle.SetFont(font);
 
                    break;
 
                case stylexls.钱:
 
                    IDataFormat format = wb.CreateDataFormat();
 
                    cellStyle.DataFormat = format.GetFormat("￥#,##0");
 
                    cellStyle.SetFont(font);
 
                    break;
 
                case stylexls.url:
 
                    fontcolorblue.Underline = 1;
 
                    cellStyle.SetFont(fontcolorblue);
 
                    break;
 
                case stylexls.百分比:
 
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00%");
 
                    cellStyle.SetFont(font);
 
                    break;
 
                case stylexls.中文大写:
 
                    IDataFormat format1 = wb.CreateDataFormat();
 
                    cellStyle.DataFormat = format1.GetFormat("[DbNum2][$-804]0");
 
                    cellStyle.SetFont(font);
 
                    break;
 
                case stylexls.科学计数法:
 
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00E+00");
 
                    cellStyle.SetFont(font);
 
                    break;
 
                case stylexls.默认:
 
                    cellStyle.SetFont(font);
 
                    break;
 
            }
 
            return cellStyle;
 
 
 
 
 
 
 
        }
 
        #endregion
 
         
 
        //从数据库读取数据写入到excel中
 
        private void btnwrite_Click(object sender, EventArgs e)
 
        {
 
            #region 创建数据库,表，设置单元的宽度
 
            //创建数据库
 
            IWorkbook wb = new HSSFWorkbook();
 
 
 
 
 
 
 
 
 
 
            //创建表
 
            ISheet sh = wb.CreateSheet("zhiyuan");
 
            
 
 
 
 
            //设置单元的宽度
 
            sh.SetColumnWidth(0, 15 * 256);
 
            sh.SetColumnWidth(1, 35 * 256);
 
            sh.SetColumnWidth(2, 15 * 256);
 
            sh.SetColumnWidth(3, 10 * 256);
 
            #endregion
 
 
 
 
 
 
 
            int i = 0;
 
 
 
 
 
 
 
            #region 练习合并单元格
 
            sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 3));
 
            IRow row0 = sh.CreateRow(0);
 
            row0.Height = 20 * 20;
 
            ICell icell1top0 = row0.CreateCell(0);
 
            ICell icell1top1 = row0.CreateCell(1);
 
            ICell icell1top2 = row0.CreateCell(2);
 
            ICell icell1top3 = row0.CreateCell(3);
 
            icell1top0.CellStyle = Getcellstyle(wb, stylexls.头);
 
            icell1top0.SetCellValue("标题合并单元");
 
            #endregion
 
 
 
 
            i++;
 
 
 
 
            #region 设置表头
 
            IRow row1 = sh.CreateRow(1);
 
            row1.Height = 20 * 20;
 
 
 
 
            ICell icell1top = row1.CreateCell(0);
 
            icell1top.CellStyle = Getcellstyle(wb, stylexls.头);
 
            icell1top.SetCellValue("网站名");
 
 
 
 
            ICell icell2top = row1.CreateCell(1);
 
            icell2top.CellStyle = Getcellstyle(wb, stylexls.头);
 
            icell2top.SetCellValue("网址");
 
 
 
 
            ICell icell3top = row1.CreateCell(2);
 
            icell3top.CellStyle = Getcellstyle(wb, stylexls.头);
 
            icell3top.SetCellValue("百度快照");
 
 
 
 
            ICell icell4top = row1.CreateCell(3);
 
            icell4top.CellStyle = Getcellstyle(wb, stylexls.头);
 
            icell4top.SetCellValue("百度收录");
 
            #endregion
 
 
 
 
            i++;
 
 
 
 
            #region 读取数据库写入表
 
            string sql = "select top 100 urlnam,url,bdtim,bdsl from zhiyuan";
 
            using (SqlDataReader dr = SqlHelper.ExecuteReaderText(sql, null))
 
            {
 
                if (dr.HasRows)
 
                {
 
                    while (dr.Read())
 
                    {
 
                        //创建行
 
                        IRow row = sh.CreateRow(i);
 
                        row.Height = 18 * 20;
 
 
 
 
 
 
 
                        //创建第1列
 
                        ICell icell = row.CreateCell(0);
 
                        icell.CellStyle = Getcellstyle(wb, stylexls.默认);
 
                        icell.SetCellValue(dr.GetValue(0).ToString());
 
 
 
 
 
 
 
                        //创建第2列
 
                        ICell icell1 = row.CreateCell(1);
 
                        icell1.CellStyle = Getcellstyle(wb, stylexls.url);
 
                        icell1.SetCellValue(dr.GetValue(1).ToString());
 
                        HSSFHyperlink link = new HSSFHyperlink(HyperlinkType.URL);
 
                        link.Address = (dr.GetValue(1).ToString());
 
                        icell1.Hyperlink = (link);
 
 
 
 
                        //创建第3列
 
                        ICell icell2 = row.CreateCell(2);
 
                        icell2.CellStyle = Getcellstyle(wb, stylexls.时间);
 
                        icell2.SetCellValue(dr.IsDBNull(2) ? Convert.ToDateTime("1990-1-1") : dr.GetDateTime(2));
 
 
 
 
                        //创建第4列
 
                        ICell icell3 = row.CreateCell(3);
 
                        icell3.CellStyle = Getcellstyle(wb, stylexls.默认);
 
                        icell3.SetCellValue(dr.IsDBNull(3) ? 0 : dr.GetInt32(3));
 
                        i++;
 
                    }
 
                }
 
            }
 
            #endregion
 
            
 
             
 
            using (FileStream fs = File.OpenWrite("xxx.xls"))
 
            {
 
                wb.Write(fs);
 
                MessageBox.Show("Excel已经写入成功！");
 
            }
 
 
 
 
        }
 
 
 
 
        //这个函数可以不看。
 
        private void CreateRow(IRow row, int j, SqlDataReader dr, ICellStyle cellstyle)
 
        {
 
            if (dr.GetFieldType(j).Name == "Int32")
 
            {
 
 
 
 
 
 
 
                row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? 0 : dr.GetInt32(j));
 
            }
 
            else if (dr.GetFieldType(j).Name == "Int16")
 
            { row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? 0 : dr.GetInt16(j)); }
 
            else if (dr.GetFieldType(j).Name == "Int64")
 
            { row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? 0 : dr.GetInt64(j)); }
 
            else if (dr.GetFieldType(j).Name == "String")
 
            { row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? "" : dr.GetString(j)); }
 
            else if (dr.GetFieldType(j).Name == "DateTime")
 
            {
 
 
 
 
                ICell cell = row.CreateCell(j);
 
                cell.CellStyle = cellstyle;
 
                cell.SetCellValue(dr.IsDBNull(j) ? Convert.ToDateTime("1990-1-1") : dr.GetDateTime(j));
 
 
 
 
            }
 
            else if (dr.GetFieldType(j).Name == "Double")
 
            { row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? 0 : dr.GetDouble(j)); }
 
            else if (dr.GetFieldType(j).Name == "Byte[]")
 
            { row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? 0 : dr.GetByte(j)); }
 
            else if (dr.GetFieldType(j).Name == "Decimal")
 
            { row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? 0 : dr.GetDouble(j)); }
 
            else
 
            {
 
 
 
 
                row.CreateCell(j).SetCellValue(dr.IsDBNull(j) ? "" : dr.GetValue(j).ToString());
 
            }
 
 
 
 
        }
 
 
 
 
        #region 读取excel
 
        private void btnreade_Click(object sender, EventArgs e)
 
        {
 
            //先创建文件流
 
            if (DialogResult.OK == openFileDialog1.ShowDialog())
 
            {
 
                using (FileStream fs = File.OpenRead(openFileDialog1.FileName))
 
                {
 
                    //申明数据库对像
 
                    IWorkbook wk = new HSSFWorkbook(fs);
 
 
 
 
                    //获取数据库中的每个表
 
                    for (int i = 0; i < wk.NumberOfSheets; i++)
 
                    {
 
                        //申明表
 
                        ISheet wk1 = wk.GetSheetAt(i);
 
 
 
 
                        txtout.AppendText("====================" + wk1.SheetName + "================
");
 
 
 
 
                        //获取表的行
 
                        for (int j = 0; j < wk1.LastRowNum + 1; j++)
 
                        {
 
                            //申明行
 
                            IRow row = wk1.GetRow(j);
 
                            for (int k = 0; k < row.LastCellNum + 1; k++)
 
                            {
 
                                txtout.AppendText(string.Format("{0}	", row.GetCell(k) == null ? "" : row.GetCell(k).ToString()));
 
                            }
 
                            txtout.AppendText("
");
 
                        }
 
                    }
 
 
 
 
                }
 
            }
 
 
 
 
        }
 
        #endregion
 
 
 
 
 
 
 
        #region 把excel转成htm
 
        private void button1_Click(object sender, EventArgs e)
 
        {
 
            if (DialogResult.OK == openFileDialog1.ShowDialog())
 
            {
 
                string str = htmlxsl.Gethtmlxls(openFileDialog1.FileName);
 
                using (FileStream fs = File.OpenWrite("1.htm"))
 
                {
 
                    byte[] b = Encoding.Default.GetBytes(str);
 
                    fs.Write(b, 0, b.Length);
 
                }
 
            }
 
        }
 
        #endregion
 
         
 
    }
 
}
 
 
 
生成htm的类
 
 
using System.Text;
 
using NPOI.HSSF.UserModel;
 
using NPOI.HPSF;
 
using NPOI.POIFS.FileSystem;
 
using NPOI.HSSF.Util;
 
using NPOI.SS.UserModel;
 
using System.IO;
 
using SqlHelPerXHC;
 
using NPOI.HSSF.Record.CF;
 
namespace Excl
 
{
 
    public static class htmlxsl
 
    {
 
        private static ISheet sht;
 
        public static string Gethtmlxls(string path)
 
        {
 
 
 
 
            IWorkbook wb = new HSSFWorkbook(new FileStream(path, FileMode.Open));
 
            sht = wb.GetSheet("zhiyuan");
 
            //取行Excel的最大行数    
 
            int rowsCount = sht.LastRowNum;
 
            //为保证Table布局与Excel一样，这里应该取所有行中的最大列数（需要遍历整个Sheet）。    
 
            //为少一交全Excel遍历，提高性能，我们可以人为把第0行的列数调整至所有行中的最大列数。    
 
            int colsCount = sht.GetRow(0).LastCellNum;
 
            int colSpan;
 
            int rowSpan;
 
            bool isByRowMerged;
 
            StringBuilder table = new StringBuilder(rowsCount * 32);
 
            table.Append("<table border='1px'>");
 
            for (int rowIndex = 0; rowIndex < rowsCount; rowIndex++)
 
            {
 
                table.Append("<tr>");
 
                for (int colIndex = 0; colIndex < colsCount; colIndex++)
 
                {
 
                    GetTdMergedInfo(rowIndex, colIndex, out colSpan, out rowSpan, out isByRowMerged);
 
                    //如果已经被行合并包含进去了就不输出TD了。            
 
                    //注意被合并的行或列不输出的处理方式不一样，见下面一处的注释说明了列合并后不输出TD的处理方式。
 
                    if (isByRowMerged)
 
                    {
 
                        continue;
 
                    }
 
                    table.Append("<td");
 
                    if (colSpan > 1)
 
                        table.Append(string.Format(" colSpan={0}", colSpan));
 
                    if (rowSpan > 1)
 
                        table.Append(string.Format(" rowSpan={0}", rowSpan));
 
                    table.Append(">");
 
                    table.Append(sht.GetRow(rowIndex).GetCell(colIndex));
 
                    //列被合并之后此行将少输出colSpan-1个TD。            
 
                    if (colSpan > 1)
 
                        colIndex += colSpan - 1;
 
                    table.Append("</td>");
 
                }
 
                table.Append("</tr>");
 
            }
 
            table.Append("</table>");
 
            return table.ToString();
 
 
 
 
        }
 
        /// <summary>
 
        ///  获取Table某个TD合并的列数和行数等信息。与Excel中对应Cell的合并行数和列数一致。
 
        /// </summary>
 
        /// <param name="rowIndex">行号</param>
 
        /// <param name="colIndex">列号</param>
 
        ///  <param name="colspan">TD中需要合并的行数</param>
 
        /// <param name="rowspan">TD中需要合并的列数</param>
 
        /// <param name="rowspan">此单元格是否被某个行合并包含在内。如果被包含在内，将不输出TD。</param>
 
        /// <returns></returns>
 
        private static void GetTdMergedInfo(int rowIndex, int colIndex, out int colspan, out int rowspan, out bool isByRowMerged)
 
        {
 
            colspan = 1;
 
            rowspan = 1;
 
            isByRowMerged = false;
 
            int regionsCuont = sht.NumMergedRegions;
 
             
 
            NPOI.SS.Util.CellRangeAddress region;
 
                 
 
            for (int i = 0; i < regionsCuont; i++)
 
            {
 
                 
 
                region = sht.GetMergedRegion(i);
 
 
 
 
                if (region.FirstRow == rowIndex && region.FirstColumn == colIndex)
 
                {
 
                    colspan = region.LastColumn - region.FirstColumn + 1;
 
                    rowspan = region.LastRow - region.FirstRow + 1;
 
                    return;
 
                }
 
                else if (rowIndex > region.FirstRow && rowIndex <= region.LastRow && colIndex >= region.FirstColumn && colIndex <= region.LastColumn)
 
                {
 
                    isByRowMerged = true;
 
                }
 
            }
 
        }
 
    }
 
}

　　来源网络：http://yuncode.net/code/c_531e679b3896495