npoi根据html字符串动态生成excel模板
npoi多表头数据导出目前有两种方法:
其一是根据excel模板来导出数据
其二是npoi动态创建多表头
上面的两种方法我都用过今天我介绍的是根据html字符串来创建excel,但是要设置响应的属性,
其实也就是对应 npoi CellRangeAddress 方法所需要的四个参数(firstrow,lastrow,firstcol,lastcol),这四个参数代表的意思是 单元格的开始行索引,结束行索引,开始列索引,结束列索引。
先要有table表头的字符串然后用HtmlAgilityPack去解析。
table字符串如下
string html=@"<table cords='3,7'>
<tr>
<td cords='0,2,0,0' rowspan='3'>111</td>
<td cords='0,0,1,2' colspan='2'>222</td>
<td cords='0,0,3,5' colspan='3'>5555</td>
<td cords='0,2,6,6' rowspan='3'>888</td>
</tr>
<tr>
<td cords='1,2,1,1' rowspan='2'>333</td>
<td cords='1,2,2,2' rowspan='2'>444</td>
<td cords='1,1,3,4' colspan='2'>666</td>
<td cords='1,1,5,5'>777</td>
</tr>
<tr>
<td cords='2,2,3,3'>6661</td>
<td cords='2,2,4,4'>6662</td>
<td cords='2,2,5,5'>771</td>
</tr>
</table>";
table上cords属性值的3,7,代表创建的table有几行几列
td上的cords属性值表示但是单元格合并所需要的四个值。
然后用npoi根据table的cords的值动态创建行和列然后根据td的cords来动态的合并单元格
完成代码如下:
HtmlDocument doc = new HtmlDocument(); doc.LoadHtml(html); HtmlNode node = doc.DocumentNode; HtmlNode div = node.SelectNodes("//table")[0]; string[] strrowcol = div.Attributes["cords"].Value.Split(','); HtmlNodeCollection hnc = node.SelectNodes("//table//tr"); HSSFWorkbook wk = new HSSFWorkbook(); ISheet tb = wk.CreateSheet("mySheet"); ICellStyle cellstyle = wk.CreateCellStyle(); cellstyle.Alignment = HorizontalAlignment.CENTER; cellstyle.VerticalAlignment = VerticalAlignment.CENTER; cellstyle.BorderBottom = CellBorderType.THIN; cellstyle.BorderLeft = CellBorderType.THIN; cellstyle.BorderRight = CellBorderType.THIN; cellstyle.BorderTop = CellBorderType.THIN; for (int m = 0; m < int.Parse(strrowcol[0]); m++) { IRow rowb = tb.CreateRow(m); for (int n = 0; n < int.Parse(strrowcol[1]); n++) { ICell cell = rowb.CreateCell(n); cell.CellStyle = cellstyle; } } for (int i = 0; i < hnc.Count; i++) { HtmlNodeCollection tdcount = hnc[i].SelectNodes("td"); for (int y = 0; y < tdcount.Count; y++) { string[] strs = tdcount[y].Attributes["cords"].Value.Split(','); tb.GetRow(int.Parse(strs[0])).GetCell(int.Parse(strs[2])).SetCellValue(tdcount[y].InnerText.Replace("\r\n", "").Trim()); tb.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(int.Parse(strs[0]), int.Parse(strs[1]), int.Parse(strs[2]), int.Parse(strs[3]))); } } //这里可以添加数据也就是动态创建行和列然后填充数据 //生成模板到excel FileStream file = new FileStream(@"D:\CreateExcel.xls", FileMode.Create); wk.Write(file); file.Close(); //不想生成的话可以直接下载 MemoryStream mstream = new MemoryStream(); wk.Write(mstream); string fileName = "动态创建excel.xls"; byte[] bytes = mstream.ToArray(); mstream.Read(bytes, 0, bytes.Length); mstream.Close(); HttpContext.Current.Response.Clear(); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ClearHeaders(); HttpContext.Current.Response.Charset = "UTF-8"; HttpContext.Current.Response.ContentType = "application/octet-stream"; Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName); HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary"); HttpContext.Current.Response.BinaryWrite(bytes); HttpContext.Current.Response.Flush(); HttpContext.Current.Response.End();
原想直接根据td的rowspan 或者colspan来直接创建excel但是做了一下没实现,就只有加个自定义的属性来实现了,如有更好的方法请留言讨论。
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