【ASP.NET】C# 将HTML中Table导出到Excel（TableToExcel）
首先，说下应用场景 就是，把页面呈现的Table 导出到Excel中。其中使用的原理是 前台使用ajax调用aspx后台，传递过去参数值，导出。使用的组件是NPOI。
前台调用：
<script type="text/javascript">
function toExcel() {
post("../TableToExcel.aspx", { act: 'tabletoexcel', html: $('#excelTable').html() });
}
function post(URL, PARAMS) {
var temp = document.createElement("form");
temp.action = URL;
temp.method = "post";
temp.style.display = "none";
for (var x in PARAMS) {
var opt = document.createElement("textarea");
opt.name = x;
opt.value = PARAMS[x];
temp.appendChild(opt);
}
document.body.appendChild(temp);
temp.submit();
return temp;
}
</script>
HTML页面内容示例：
<div class="formbody" id="excelTable"> <div class="formtitle"><span>报告详情页</span></div> <table style="width: 100%;" id="tableCriHead" runat="server"> <tr> <td>TEST</td> </tr> </table> </div>
后台生成代码：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using NPOI.HSSF.UserModel; using NPOI.HPSF; using NPOI.POIFS.FileSystem; using NPOI.HSSF.Util; using System.Text.RegularExpressions; using System.IO; namespaceDemo { public partial class TableToExcel : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string act = GetValue("act"); //toExcel.aspx?act=tabletoexcel&html=<table class="reportstable">..</table> if (act == "tabletoexcel") { TableToExcelMethod(); } } public void TableToExcelMethod() { string tableHtml = Request.Form["html"]; //接受前台table 数值字符串 if (string.IsNullOrEmpty(tableHtml)) { return; } InitializeWorkbook(); HSSFSheet sheet1 = (HSSFSheet)hssfworkbook.CreateSheet("Sheet1"); string rowContent = string.Empty; MatchCollection rowCollection = Regex.Matches(tableHtml, @"<tr[^>]*>[\s\S]*?<\/tr>", RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture); //对tr进行筛选 NPOI.SS.UserModel.IFont fontSubTitle = hssfworkbook.CreateFont(); fontSubTitle.Boldweight = 800;//加粗 NPOI.SS.UserModel.IFont fontBody = hssfworkbook.CreateFont(); fontBody.Boldweight = 500;//加粗 for (int i = 0; i < rowCollection.Count; i++) { HSSFRow row = (HSSFRow)sheet1.CreateRow(i); rowContent = rowCollection[i].Value; MatchCollection columnCollection = Regex.Matches(rowContent, @"<th[^>]*>[\s\S]*?<\/th>", RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture); //对td进行筛选 for (int td = 0; td < columnCollection.Count; td++) { row.CreateCell(td).SetCellValue(HtmlToTxt(columnCollection[td].Value)); } columnCollection = Regex.Matches(rowContent, @"<td[^>]*>[\s\S]*?<\/td>", RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture); //对td进行筛选 for (int td = 0; td < columnCollection.Count; td++) { row.CreateCell(td).SetCellValue(HtmlToTxt(columnCollection[td].Value)); } } WriteToFile(); downFile(ppath); } static HSSFWorkbook hssfworkbook; public string ppath; public void WriteToFile() { string year = DateTime.Now.Year.ToString(); ppath = HttpContext.Current.Server.MapPath(DateTime.Now.ToString("yyyyMMddmmss") + ".xls"); FileStream file = new FileStream(ppath, FileMode.Create); hssfworkbook.Write(file); file.Close(); } public void InitializeWorkbook() { hssfworkbook = new HSSFWorkbook(); ////create a entry of DocumentSummaryInformation DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation(); dsi.Company = "company"; hssfworkbook.DocumentSummaryInformation = dsi; ////create a entry of SummaryInformation SummaryInformation si = PropertySetFactory.CreateSummaryInformation(); si.Subject = "xxx"; hssfworkbook.SummaryInformation = si; } public void downFile(string ppath) { if (File.Exists(ppath)) { Response.ClearHeaders(); Response.Clear(); Response.Expires = 0; Response.Buffer = true; Response.AddHeader("Accept-Language", "zh-cn"); string name = System.IO.Path.GetFileName(ppath); System.IO.FileStream files = new FileStream(ppath, FileMode.Open, FileAccess.Read, FileShare.Read); byte[] byteFile = null; if (files.Length == 0) { byteFile = new byte[1]; } else { byteFile = new byte[files.Length]; } files.Read(byteFile, 0, (int)byteFile.Length); files.Close(); File.Delete(files.Name); Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(name, System.Text.Encoding.UTF8)); Response.ContentType = "application/octet-stream;charset=gbk"; Response.BinaryWrite(byteFile); Response.End(); } } /// <summary> /// POST/GET 参数获取 /// </summary> /// <param name="context"></param> /// <param name="name"></param> /// <returns></returns> private string GetValue(string name) { string result = ConvertToString(Request.QueryString[name], ""); if (string.IsNullOrEmpty(result)) { result = ConvertToString(Request.Form[name], ""); } return FilterSpecial(result); } public static string ConvertToString(Object obj, string strDefault) { try { if (obj == null) { return strDefault; } return obj.ToString(); } catch { } return strDefault; } /// <summary> /// HTML转行成TEXT /// </summary> /// <param name="strHtml"></param> /// <returns></returns> public static string HtmlToTxt(string strHtml) { string[] aryReg ={ @"<script[^>]*?>.*?</script>", @"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>", @"([\r\n])[\s]+", @"&(quot|#34);", @"&(amp|#38);", @"&(lt|#60);", @"&(gt|#62);", @"&(nbsp|#160);", @"&(iexcl|#161);", @"&(cent|#162);", @"&(pound|#163);", @"&(copy|#169);", @"&#(\d+);", @"-->", @"<!--.*\n" }; string newReg = aryReg[0]; string strOutput = strHtml; for (int i = 0; i < aryReg.Length; i++) { Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase); strOutput = regex.Replace(strOutput, string.Empty); } strOutput.Replace("<", ""); strOutput.Replace(">", ""); strOutput.Replace("\r\n", ""); return strOutput; } /// <summary> /// 过滤特殊字符 /// 如果字符串为空，直接返回。 /// </summary> /// <param name="str">需要过滤的字符串</param> /// <returns>过滤好的字符串</returns> public static string FilterSpecial(string str) { if (str == "") { return str; } else { str = str.Replace("'", ""); str = str.Replace("<", ""); str = str.Replace(">", ""); str = str.Replace("%", ""); str = str.Replace("'delete", ""); str = str.Replace("''", ""); str = str.Replace("\"\"", ""); str = str.Replace(",", ""); str = str.Replace(".", ""); str = str.Replace(">=", ""); str = str.Replace("=<", ""); str = str.Replace("-", ""); str = str.Replace("_", ""); str = str.Replace(";", ""); str = str.Replace("||", ""); str = str.Replace("[", ""); str = str.Replace("]", ""); str = str.Replace("&", ""); str = str.Replace("#", ""); str = str.Replace("/", ""); str = str.Replace("-", ""); str = str.Replace("|", ""); str = str.Replace("?", ""); str = str.Replace(">?", ""); str = str.Replace("?<", ""); str = str.Replace(" ", ""); return str; } } } }
附上NPOI的DLL下载地址： 点 击 下 载
最后，整体来说能够导出table到excel，但是同时存在一个问题，就是 导出后没有table的样式。