使用NPOI将TABLE内容导出到EXCEL

项目中需要将页面中的table内容导出到EXCEL，在用了几种方法后发现NPO是最快&最好的

需要应用 NPOI.dll 还有个Ionic.Zip.dll不知道有用没，没去研究，两个DLL都放到bin目录里了

NPOIX dll点击下载

假设页面中有个<div id="excelTable"><table>.....</table></div>需要导出到EXCEL

在页面中加一个button

<input type="button" name="excelBut" value="导出Excel" onclick="toExcel()" class="sgbtn" />

页面任意部分插入一段javascript：

function toExcel()
{
post("tools/toExcel.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;
}

toExcel.aspx文件空白即可

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="toExcel.aspx.cs" Inherits="tools_toExcel" %>

toExcel.aspx.cs代码如下：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Text;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.POIFS.FileSystem;
using NPOI.HSSF.Util;
using System.Text.RegularExpressions;
using System.IO;

public partial class tools_toExcel : 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")
{
TableToExcel();
}
}

public void TableToExcel()
{
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(StrTools.HtmlToTxt(columnCollection.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(StrTools.HtmlToTxt(columnCollection.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 = ConvertData.ConvertToString(Request.QueryString[name], "");
if (string.IsNullOrEmpty(result))
{
result = ConvertData.ConvertToString(Request.Form[name], "");
}
return StrTools.SafeSqlstr(result);
}
}

　　这样就可以将HTML中的TABLE方便地导出EXCEL了～代码有点乱，别介意哈。