JSP中我点刷新又重新执行了一遍操作，怎么才能避免？
<%@ page language="java"%>
<%@ page contentType="text/html; charset=gb2312" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html locale="true">
<script language="javascript">
function t(frm){
if(frm.concent.value=="")
{
alert("询价内容不能为空！")
frm.concent.focus();
return (false);
}
}
</script>
<script language="Javascript1.1" src="../staticJavascript.jsp"/></script>
<HEAD>
<TITLE>询价记录</TITLE>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<% if (request.getParameter("orderid")!=null)
{%>
<meta http-equiv="refresh" content="20;url=rfq.do?id1=<%=request.getParameter("buyerid")%>&id2=<%=request.getParameter("salerid")%>&id3=<%=request.getParameter("orderid")%>&id4=<%=request.getParameter("order2id")%>
&id5=<%=request.getParameter("nameid")%>&id6=<%=request.getParameter("authid")%>">
<%}else
{%>
<meta http-equiv="refresh" content="20;url=rfq.do?id1=<%=request.getParameter("id1")%>&id2=<%=request.getParameter("id2")%>&id3=<%=request.getParameter("id3")%>&id4=<%=request.getParameter("id4")%>&id5=<%=request.getParameter("id5")%>&id6=<%=request.getParameter("id6")%>">
<%}%>
<link href="NEWS.CSS" rel="stylesheet" type="text/css">
</head>
<body>
<TABLE cellSpacing=1 cellPadding=4 width="98%" align=center border=0>
<TR>
<TD bgColor=#6a813a><font color="#ffffff">
<% if (request.getParameter("orderid")!=null)
{%>
<%=request.getParameter("order2id")%>
<%}else
{%> <%=request.getParameter("id4")%>
<%}%>
<% if (request.getParameter("nameid")!=null)
{%>
<%=request.getParameter("nameid")%>
<%}else
{%> <%=request.getParameter("id5")%>
<%}%>
<% if (request.getParameter("authid")!=null)
{%>
<%=request.getParameter("authid")%>
<%}else
{%> <%=request.getParameter("id6")%>
<%}%>
</font></TD></TR></TABLE>
<% int i=1;%>
<logic:iterate id="rfq" name="rfqList">
<TABLE style="TABLE-LAYOUT: fixed; WORD-WRAP: break-word" cellSpacing=1
cellPadding=4 width="98%" align=center bgColor=#c0c0b3 border=0>
<TR bgColor=#3480c6>
<TD vAlign=top align=left width="18%"
bgColor=#ffffff> <%=i++%>
</TD>
<TD vAlign=top width="82%" bgColor=#ffffff>
<TABLE style="TABLE-LAYOUT: fixed; WORD-WRAP: break-word" cellSpacing=1
cellPadding=4 width="100%" border=0>
<TR bgColor=#ffffff>
<TD vAlign=bottom bgColor=#ffffff> <bean:write name="rfq" property="concent" filter="true"/>
<font color='#CCCCCC'>(<bean:write name="rfq" property="time" formatKey="global.formatDateTimeAll" filter="true"/>) </FONT>
</TD>
</TR>
</TABLE>
</TD></TR>
</TABLE>
</logic:iterate>
<logic:notPresent name="rfq">
<center><bean:message key="error.find"/></center>
</logic:notPresent>
<TABLE cellSpacing=1 cellPadding=4 width="98%" align=center border=0>
<TR>
<TD align=middle></TD></TR></TABLE>
<SCRIPT language=JavaScript>
</SCRIPT>
<TABLE cellSpacing=1 cellPadding=4 width="98%" align="center" bgColor=#e6e6e6 border=0>
<html:form action="/rfq.do" method="post" focus="concent" onsubmit="return t(concentForm);">
<TR bgColor=#3480c6>
<TD vAlign=top align= width="146" bgColor=#ffffff><BR>询价内容</TD>
<TD bgColor=#ffffff width="704"><html:textarea property="concent" value='' cols="40" rows="10"/> </TD></TR>
<TR bgColor=#3480c6>
<TD vAlign=top align=middle bgColor=#ffffff colSpan=2 >
<p>
<html:hidden property="buyerid" value='<%=request.getParameter("id1")%>'/>
<html:hidden property="salerid" value='<%=request.getParameter("id2")%>'/>
<html:hidden property="orderid" value='<%=request.getParameter("id3")%>'/>
<html:hidden property="order2id" value='<%=request.getParameter("id4")%>'/>
<html:hidden property="nameid" value='<%=request.getParameter("id5")%>'/>
<html:hidden property="authid" value='<%=request.getParameter("id6")%>'/>
<BR>
<html:hidden property="act" value='create'/>
<input type="submit" value="提交" name="B3">
<input type="reset" value="重置" name="B1">
<a href="rfq.do?id1= <% if (request.getParameter("buyerid")!=null)
{%>
<%=request.getParameter("buyerid")%>
<%}else
{%> <%=request.getParameter("id1")%>
<%}%>&id2=<% if (request.getParameter("salerid")!=null)
{%>
<%=request.getParameter("salerid")%>
<%}else
{%> <%=request.getParameter("id2")%>
<%}%>&id3=<% if (request.getParameter("orderid")!=null)
{%>
<%=request.getParameter("orderid")%>
<%}else
{%> <%=request.getParameter("id3")%>
<%}%>&id4=<% if (request.getParameter("order2id")!=null)
{%>
<%=request.getParameter("order2id")%>
<%}else
{%> <%=request.getParameter("id4")%>
<%}%>
&id5=<% if (request.getParameter("nameid")!=null)
{%>
<%=request.getParameter("nameid")%>
<%}else
{%> <%=request.getParameter("id5")%>
<%}%>&id6=<% if (request.getParameter("authid")!=null)
{%>
<%=request.getParameter("authid")%>
<%}else
{%> <%=request.getParameter("id6")%>
<%}%>" >刷新</a>
</form>
</p>
</TD></TR> </html:form></TABLE>
</body>
</html:html>
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