在index页面加入以下js即可：
<script>
history.go(1);
script>
例如：
<html>
<head>
<title>系统首页title>
<script language='javascript'>
history.go(1);
script>
<meta http-equiv=Content-Type content=text/html;charset=gb2312>
head>
<s:if test="#session.user == null">
<c:redirect url="error.jsp">c:redirect>
s:if>
<frameset rows="64,*" frameborder="NO" border="0" framespacing="0">
<frame src="top.jsp" noresize="noresize" frameborder="NO" name="topFrame" scrolling="no" marginwidth="0" marginheight="0" target="main" />
<frameset cols="200,*" rows="560,*" id="frame">
<frame src="left.jsp" name="leftFrame" noresize="noresize" marginwidth="0" marginheight="0" frameborder="0" scrolling="no" target="main" />
<frame src="right.jsp" name="main" marginwidth="0" marginheight="0" frameborder="0" scrolling="auto" target="_self" />
frameset>
frameset>
<noframes>
<body>body>
noframes>