对于HTM网页，加入：
<meta HTTP-EQUIV="pragma" CONTENT="no-cache">
<meta HTTP-EQUIV="Cache-Control" CONTENT="no-cache, must-revalidate">
<meta HTTP-EQUIV="expires" CONTENT="0">
然后，jsp页面中加入：
<%
response.setHeader("Cache-Control","no-store");
response.setHeader("Pragrma","no-cache");
response.setDateHeader("Expires",0);
%>
''' <summary>
''' 获取网页html源码。
''' </summary>
''' <param name="AUrl"></param>
''' <returns></returns>
''' <remarks></remarks>
Public Shared Function GetHtml(ByVal AUrl As String, ByVal APageCode As System.Text.En ......
<table id="tableExcel" width="100%" border="1" cellspacing="0" cellpadding="0">
<tr>
<td colspan="5" align="center">html 表格导出道Excel</td>
</tr>
<tr>
<td>列标题1</td>
<td>列标题2</td>
......
