运行jsp出现错误Unable to compile class for JSP

An error occurred at line: 34 in the jsp file: /shoppingcart.jsp
Collection cannot be resolved to a type
31: <%
32:   int i_totalnum=0;
33:   double d_totalamount=0.0;
34:   Collection c_cart=(Collection)session.getAttribute("cart");
35:   Iterator it=null;
36:   if(c_cart!=null&&c_cart.size()>0){%>
37:         <tr> 
全部代码
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script language="JavaScript" type="text/JavaScript">
<!--
  function MM_goToURL() { //v3.0
    var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
    for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}
//-->
</script>
<body>
<div align="center">
<table width="750" border="0" cellspacing="1" cellpadding="1">
  <tr> 
    <td ><div align="center"><%@include file="top.jsp" %></div></td>
  </tr>
  <tr> 
    <td ><div align="center">
      <table width="100%" border="0" cellpadding="1" cellspacing="1" class="td">
        <tr> 
          <td colspan="7">购物车</td>
        </tr>
        <tr> 
          <td colspan="7"><hr size="1" noshade width="100%"></td>
        </tr>
<%
  int i_totalnum=0;
  double d_totalamount=0.0;
  Collection c_cart=(Collection)session.getAttribute("cart");
  Iterator it=null;
  if(c_cart!=null&&c_cart.size()>0){%>
        <tr> 
          <td>产品编号号</td>
          <td>品名</td>
          <td>原产地</td>
          <td>单价</td>
          <td>数量(件)</td>
          <td>合价</td>
  <td>操作</td>
        </tr>
<%
    it=c_cart.iterator();
    while(it.hasNext()){
      cartBean cbean=(cartBean)(it.next());
      i_totalnum+=cbean.ordernum;
      d_totalamount+=cbean.subtotal;
%>
        <tr> 
          <td height="19"><a href="bookdetail.jsp?bookid=<%=cbean.bookid%>" target="_blank"><%=cbean.bookid%></a></td>
          <td><%=cbean.bookname%></td>
          <td><%=cbean.publish%></td>
          <td>￥<%=cbean.unitprice%></td>
          <td><input type="text" class="formtext" value="<%=cbean.ordernum%>" size="5" readonly>&nbsp;
      <input type="button" onClick="MM_goToURL('parent','increaseCart.jsp?bookid=<%=cbean.bookid%>');return document.MM_returnValue" value="+">&nbsp;
      <input type="button" onClick="MM_goToURL('parent','decreaseCart.jsp?bookid=<%=cbean.bookid%>');return document.MM_returnValue" value="-"></td>
          <td>￥<%=cbean.subtotal%></td>
  <td><a href="delfromcart.jsp?bookid=<%=cbean.bookid%>">取消</a></td>
        </tr>
<%  }//while%>   
        <tr> 
          <td colspan="4"><div align="right">合计</div></td>
          <td ><%=i_totalnum%>(本)</td>
<%
    d_totalamount=Math.round(d_totalamount*100)/100.00;
%>
          <td colspan="2">￥<%=d_totalamount%></td>
        </tr>   
        <tr> 
          <td colspan="7"> <div align="center">
            <input type="button" onClick="MM_goToURL('parent','clearcart.jsp');return document.MM_returnValue" value=" 清空购书车 "> &nbsp;&nbsp;
            <input type="button" onClick="MM_goToURL('parent','index.jsp');return document.MM_returnValue" value=" 继续购书 ">&nbsp;&nbsp;
            <input type="button" onClick="MM_goToURL('parent','order1.jsp');return document.MM_returnValue" value=" 去收银台 ">
             </div></td>
        </tr>
<%}else{%>
        <tr> 
          <td colspan="7"> <div align="center">您的购物车为空!</div></td>
        </tr>
<% }//else%>           
      </table>
    </div></td>
  </tr>  
  <tr> 
    <td ><div align="center"><%@include file="bottom.jsp" %></div></td>
  </tr>
</table>
</div>   
</body>
</html>