Question

我需要将值从一个jsp传递到另一个jsp，然后在另一个jsp中处理这些值，然后jsp将包含在第一个jsp中。

我需要传递的jsp变量是从Comp_Mps_hs.jsp到Comp_Mps_hs_diff.jsp

<jsp:useBean id="ref" class="comp_Mps.Comp_Mps_hs"/>

<br>

  <%
//Comaprision obj = new Comaprision();
   String s_date= request.getParameter("startdate");
   pageContext.setAttribute("s_date", s_date);
   String e_date= request.getParameter("enddate");
   pageContext.setAttribute("e_date", e_date);
   ref.refarray_vac1(s_date,e_date);
   ref.ClosestToMultiplesOfTen_User(s_date,e_date);

%>


<%
//Comaprision reference = new Comaprision();
   String ref_name= request.getParameter("ref_logtime");
   pageContext.setAttribute("ref_name", ref_name);
   ref.FindClosestToMultiplesOfTen(ref_name);
   ref.refernece(ref_name);

%>

<br><br><br>

 <table width = "170%" border = "1" cellspacing="0" cellpadding="0">
 <tr>
 <th>Date_Time</th>
     <th>beam_current</th>
     <th>beam_energy</th>
     <%
     for(int i=51; i<99;i++){
     %>
       <th>p<%=i%>_readback</th>
        <th>p<%=i%>_setvalue</th>
        <th>p<%=i%>_vmeset</th>
        <th>p<%=i%>_dacbyadc</th>
     <%
     }
     %>
     <!--  


   </tr>


<c:set var="count" value="0" scope="session" />

<c:forEach var="row" items="${ref.refarray_vac1(param.startdate,param.enddate)}">
<c:forEach var="r" items="${ref.refernece(param.ref_logtime)}" begin="${count}" end="${count}"> 

<tr bgcolor="darkgray ">
<td><c:out value="${r.logtime}"></c:out></td>
<td>
<c:out value="${r.beam_current}"></c:out> </td>
<td>
<c:out value="${(r.beam_energy)}"/> 
</td>
<td>
<fmt:formatNumber value="${(r.p51_readback)}" maxFractionDigits="2" minIntegerDigits="2"  var="mm"></fmt:formatNumber>
<c:out value="${(r.p51_readback)}"/> 
</td>
<td>
<fmt:formatNumber value="${(r.p51_setvalue)}" maxFractionDigits="2" minIntegerDigits="2"  var="mm"></fmt:formatNumber>
<c:out value="${(mm)}"/> 
</td>
</tr>

<!-- For user_selection color name-- darkkhaki -->

<tr bgcolor="cornsilk">

<td><c:out value="${row.logtime}"></c:out></td>

<td>
<c:out value="${row.beam_current}"></c:out> </td>

<td>
<c:out value="${(row.beam_energy)}"/> 
</td>

<td>
<fmt:formatNumber value="${(row.p51_readback)}" maxFractionDigits="2" minIntegerDigits="2"  var="mm"></fmt:formatNumber>
<c:out value="${(row.p51_readback)}"/> 
</td>
<td>
<fmt:formatNumber value="${(row.p51_setvalue)}" maxFractionDigits="2" minIntegerDigits="2"  var="mm"></fmt:formatNumber>
<c:out value="${(mm)}"/> 
</td>
</tr>


<tr>

<td>Deviation</td>

<jsp:include page="Mps_Hs_diff.jsp"></jsp:include>**Here I need to include another jsp  as the cod ewas becoming large**


<c:set var="count" value="${count + 1}" scope="session" />
</c:forEach>
</c:forEach>


 </table>

</body>

我需要在此页面中声明的r和row值的另一个页面是

<body>
<jsp:useBean id="ref" class="comp_Mps.Comp_Mps_hs"/>

<br>

  <%
//Comaprision obj = new Comaprision();
   String s_date= request.getParameter("startdate");
   pageContext.setAttribute("s_date", s_date);
   String e_date= request.getParameter("enddate");
   pageContext.setAttribute("e_date", e_date);
   ref.refarray_vac1(s_date,e_date);
   ref.ClosestToMultiplesOfTen_User(s_date,e_date);

%>


<%
//Comaprision reference = new Comaprision();
   String ref_name= request.getParameter("ref_logtime");
   pageContext.setAttribute("ref_name", ref_name);
   ref.FindClosestToMultiplesOfTen(ref_name);
   ref.refernece(ref_name);

%>

<br><br><br>



 <table width = "170%" border = "1" cellspacing="0" cellpadding="0">
 <c:set var="row" value="${ref.refarray_vac1(param.startdate,param.enddate)}"></c:set>
 <c:set var="r" value="${ref.refernece(param.ref_logtime)}"></c:set>
 <tr>


<td scope="row" style="${r.beam_current-row.beam_current eq 0 ? 'background-color: lime':'background-color: pink'}">
<fmt:formatNumber value="${(r.beam_current-row.beam_current)}" maxFractionDigits="2" minIntegerDigits="2"  var="mm"></fmt:formatNumber>
<c:out value="${mm}" ></c:out></td>


<td scope="row" style="${r.beam_energy-row.beam_energy eq 0 ? 'background-color: lime':'background-color: pink'}">
<fmt:formatNumber value="${(r.beam_energy-row.beam_energy)}" maxFractionDigits="2" minIntegerDigits="2"  var="mm"></fmt:formatNumber>
<c:out value="${mm}" ></c:out></td>

<td style="${r.p51_readback-row.p51_readback eq 0 ? 'background-color: lime':'background-color: pink'}">
<fmt:formatNumber value="${((r.p51_readback-row.p51_readback))}" maxFractionDigits="2" minIntegerDigits="2" pattern="##.##" var="nn"></fmt:formatNumber>
<c:out value="${nn}"></c:out>
<fmt:formatNumber value="${(r.p51_readback-row.p51_readback)/r.p51_readback}" maxFractionDigits="2" minIntegerDigits="2" type="percent" var="mm"></fmt:formatNumber>
<c:out value="(${mm})" ></c:out></td>

但是第一页从未被用户调用，另一个页面被调用，其按钮单击第一个jsp被调用。因此，我所包含的页面中的值永远不会被处理，因为它永远不会被调用。

Answer 1

一种选择是使用会话范围，以便在当前会话期间使您的变量在任何JSP或servlet中可用。

您可以将变量存储在会话范围中：

HttpSession session = request.getSession();
String variableToPass = "hello";
session.setAttribute("variableToPass", variableToPass);

而且，您可以像这样访问它们：

HttpSession session = request.getSession();
String variablePassed = session.getAttribute("variableToPass");

希望它有用。

如何将在一个jsp中定义的变量传递给另一个jsp，然后在另一个jsp中处理后再次将jsp包含在第一个jap页面中

1 个答案: