学步园

//创建xls文件
private void button1_Click(object sender, EventArgs e)
{
//创建工作薄
HSSFWorkbook wk = new HSSFWorkbook();
//创建一个名称为mySheet的表
ISheet tb = wk.CreateSheet("mySheet");
//创建一行，此行为第二行
IRow row = tb.CreateRow(1);
for (int i = 0; i < 20; i++)
{
ICell cell = row.CreateCell(i); //在第二行中创建单元格
cell.SetCellValue(i);//循环往第二行的单元格中添加数据
}
using (FileStream fs = File.OpenWrite(@"c:/myxls.xls")) //打开一个xls文件，如果没有则自行创建，如果存在myxls.xls文件则在创建是不要打开该文件！
{
wk.Write(fs); //向打开的这个xls文件中写入mySheet表并保存。
MessageBox.Show("提示：创建成功！");
}
}

//读取xls文件
private void button2_Click(object sender, EventArgs e)
{ StringBuilder sbr = new StringBuilder();
using (FileStream fs = File.OpenRead(@"c:/myxls.xls")) //打开myxls.xls文件
{
HSSFWorkbook wk = new HSSFWorkbook(fs); //把xls文件中的数据写入wk中
for (int i = 0; i < wk.NumberOfSheets; i++) //NumberOfSheets是myxls.xls中总共的表数
{
ISheet sheet = wk.GetSheetAt(i); //读取当前表数据
for (int j = 0; j <= sheet.LastRowNum; j++) //LastRowNum 是当前表的总行数
{
IRow row = sheet.GetRow(j); //读取当前行数据
if (row != null)
{
sbr.Append("-------------------------------------\r\n"); //读取行与行之间的提示界限
for (int k = 0; k <= row.LastCellNum; k++) //LastCellNum 是当前行的总列数
{
ICell cell = row.GetCell(k); //当前表格
if (cell != null)
{
sbr.Append(cell.ToString()); //获取表格中的数据并转换为字符串类型
}
}
}
}
}
}
sbr.ToString();
using (StreamWriter wr = new StreamWriter(new FileStream(@"c:/myText.txt", FileMode.Append))) //把读取xls文件的数据写入myText.txt文件中
{
wr.Write(sbr.ToString());
wr.Flush();
}

}

//创建一个常用的xls文件
private void button3_Click(object sender, EventArgs e)
{
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);
int i = 0;
#region 练习合并单元格
sh.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 3));

//CellRangeAddress（）该方法的参数次序是：开始行号，结束行号，开始列号，结束列号。

IRow row0 = sh.CreateRow(0);
row0.Height = 20 * 20;
ICell icell1top0 = row0.CreateCell(0);
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

using(FileStream stm=File.OpenWrite(@"c:/myMergeCell.xls"))
{
wb.Write(stm);
MessageBox.Show("提示：创建成功！");
}
}

#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.BLUE.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