protected void btnExport_Click(object sender, EventArgs e)
{
string strFileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".doc";
string sHtml = hfdHtml.Value;//前台的HTML传递过来的，注意加ValidateRequest="false"
string sMht = HtmlToMht(sHtml);
DnLoadFileFromMemoryStream(strFileName, sMht);
}
/// <summary>
/// 将HTML文本导出到Word或者MHT格式
/// </summary>
/// <param name="strHtml"></param>
/// <returns></returns>
public static string HtmlToMht(string strHtml)
{
strHtml = strHtml.Replace("<", "<").Replace(">", ">");
StringBuilder sb = new StringBuilder();
sb.AppendLine("From:");
sb.AppendLine("Subject:");
sb.AppendLine("Date:");
sb.AppendLine("MIME-Version: 1.0");
sb.AppendLine("Content-Type: multipart/related;");
sb.AppendLine("\ttype=\"text/html\";");
sb.AppendLine("\tboundary=\"----=_AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\"");
sb.AppendLine("\n");
sb.AppendLine("------=_AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
sb.AppendLine("Content-Type: text/html;");
sb.AppendLine("charset=\"gb2312\"");
sb.AppendLine("Content-Transfer-Encoding: quoted-printable");
sb.AppendLine("\n");
sb.AppendLine("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
sb.AppendLine("<html xmlns=\"http://www.w3.org/1999/xhtml\">");
sb.AppendLine("<head>");
sb.AppendLine("<style>");
sb.AppendLine("@page WordSection1");
sb.AppendLine("{size:532.5pt 757.5pt;");
sb.AppendLine("mso-page-orientation:poPortrait;");
sb.AppendLine("margin:26.25pt 26.25pt 26.25pt 26.25pt;");
sb.AppendLine("mso-header-margin:42.55pt;");
sb.AppendLine("mso-footer-margin:49.6pt;");
sb.AppendLine("mso-paper-source:0;}");
sb.AppendLine("div.WordSection1");
sb.AppendLine("{page:WordSection1;}");
sb.AppendLine("</style>");
sb.AppendLine("</head>");
sb.AppendLine("<body>");
sb.AppendLine("<div class=3DWordSection1>");
sb.AppendLine(strHtml.Replace("src=", "src=3D").Replace("style=\"", "style= \\\"")).Replace("rowSpan=", "rowSpan=\\\"")
.Replace("colSpan=", "colSpan=\\\"").Replace("width=", "width=\\\"").Replace("height=", "height=\\\"");
sb.AppendLine("</div>");
sb.AppendLine("</body>");
sb.AppendLine("</html>");
sb.AppendLine("\n");
string[] imgSrcs = GetHtmlImageUrlList(strHtml);
if (imgSrcs.Length > 0)
{
for (int i = 0; i < imgSrcs.Length; i++)
{
string strLink = imgSrcs[i];
string strBianm = ConvertBase64(strLink);
if (strBianm != "")
{
sb.AppendLine("\n");
sb.AppendLine("------=_AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
sb.AppendLine("Content-Type: image/jpeg");
sb.AppendLine("Content-Transfer-Encoding: base64");
sb.AppendLine("Content-Location: " + strLink);
sb.AppendLine("\n");
sb.AppendLine(strBianm);
sb.AppendLine("\n");
}
}
}
sb.AppendLine("------=_AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA--");
return sb.ToString();
}
/// <summary>
/// 更改Img等HTML标签从相对路径改为绝对路径，注意HTML里初始化时是什么路径，在后台就是什么路径，它不会在后台变为绝对路径，所以有必要转换一下，不然导出的图片不能显示
/// </summary>
/// <param name="sHtmlText"></param>
/// <returns></returns>
public static string[] GetHtmlImageUrlList(string sHtmlText)
{
// 定义正则表达式用来匹配 img 标签
Regex regImg = new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);
// 搜索匹配的字符串
MatchCollection matches = regImg.Matches(sHtmlText);
int i = 0;
string[] sUrlList = new string[matches.Count];
// 取得匹配项列表
foreach (Match match in matches)
sUrlList[i++] = match.Groups["imgUrl"].Value;
return sUrlList;
}
/// <summary>
/// 将图片转换为Base64位格式字符串流
/// </summary>
/// <param name="filepath"></param>
/// <returns></returns>
public static string ConvertBase64(string filepath)
{
//变量
string result = string.Empty;
string path = string.Empty;
if (filepath.Trim().Substring(0, 4) == "http")
{
result = string.Empty;
}
else
{
path = HttpContext.Current.Server.MapPath(filepath);
//将文件转换为stream
using (FileStream fs = new FileStream(path, FileMode.Open))
{
byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
result = Convert.ToBase64String(buffer); //base64编码
}
}
//返回编码后的字符串
return result;
}
/// <summary>
/// 将文本流转换为word流
/// </summary>
/// <param name="sFileName"></param>
/// <param name="sContent"></param>
public static void DnLoadFileFromMemoryStream(string sFileName, string sContent)
{
byte[] arrByte = Encoding.UTF8.GetBytes(sContent);
using (MemoryStream ms = new MemoryStream())
{
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + sFileName);
HttpContext.Current.Response.BinaryWrite(arrByte);
}
}
