jsp 页面内变量的使用范围

Question

contractNum在哪里定义的？索性全贴出来好了

Answer 1

<%!
String contractNum;
%><%
String salesman_name=getString(request.getParameter("Salesman_name"));
String contract_num=request.getParameter("Contract_num");
String unit_name=getString(request.getParameter("Contract_unit_name"));
String contract_begin_date=request.getParameter("Contract_min_date");
String  contract_end_date=request.getParameter("Contract_max_date");
String salesman_branch=getString(request.getParameter("Salesman_branch"));
String sql="select * from VIEW4";
%〉
<table width="963" border="1" align="center">
  <caption>
    信息结果
  </caption>
  <tr>
    <td>合同编号</td>
    <td>业务员名称</td>
    <td>所属部门</td>
    <td>单位名称</td>
    <td>签订时间</td>
  </tr>
   <%
   Vector v=new Vector();
ResultSet rs=connection1.executeQuery(sql);
while(rs.next())
{
  Salesman_name=rs.getString("Salesman_name"); 
  Salesman_branch=rs.getString("Salesman_branch"); 
  Contract_num=rs.getString("Contract_num");
  Contract_sign_date=rs.getDate("Contract_sign_date");
  Contract_unit_name=rs.getString("Contract_unit_name");
  v.addElement(Contract_num);%>
  <tr ondblclick="javascript:location.href='detailInfo.jsp?id=<%=Contract_num%>'">
    <td height="17"><%=Contract_num%></td>
    <td><%=Salesman_name%></td>
    <td><%=Salesman_branch%></td>
    <td><%=Contract_unit_name%></td>
    <td><%=Contract_sign_date%></td>
  </tr>
  <%}%>
</table>
<%
for(int i=0;i<v.size();i++){
 contractNum=v.get(i).toString();
 System.out.println(contractNum);
InfoBean bean=redFunction.selectContractBase(contractNum);
Vector detailedVector=redFunction.selectContractDetailed(contractNum);
%>
<table width="982" border="0" class="m">
     <tr bgcolor="#FF3366">
       <td width="69">合同号:</td>
       <td width="65"><%=contractNum%></td>
       <td width="105">&nbsp;签订日期:</td>
       <td width="123"><%=bean.getContractSignDate()%></td>
       <td width="105">业务员姓名:</td>
       <td width="105"><%=bean.getSalesManName()%></td>
       <td width="98">单位名称:</td>
       <td width="260"><%=bean.getDepartment()%></td>
     </tr>
  </table>
   <table width="1250" border="1">
   <tr bgcolor="#C9E0CA">
     <td width="59" height="19">款式</td>
     <td width="69">面料代码</td>
     <td width="63">订货数量</td>
     <td width="52">货品单价</td>
     <td width="60">总额</td>
     <td width="70">量体人员</td>
     <td width="66">返修人员</td>
     <td width="67">返修率</td>
     <td width="69">名誉等级</td>
     <td width="71">客户信誉</td>
     <td width="70">客户要求</td>
     <td width="73">计划数量</td>
     <td width="90">后补计划数量</td>
     <td width="74">面料尺寸</td>
     <td width="62">操作员</td>
     <td width="67">计量单位</td>
     <td width="62">币种</td>
   </tr>
   <%
   System.out.println(contractNum);
   for(int m=0;m<detailedVector.size();m++){
   ContractDetailedInfo info=(ContractDetailedInfo)detailedVector.get(m);
   %>
   <tr>

Answer 2

前面的都能执行，到输出contractNum时就错了，说空指针

Answer 3

我现在见到这种html和java混在一起的jsp就头痛