将多个参数值从 JSP 发送到 servlet

Question

The answer to my question is partially here but, not working for me Sending multiple parameters to servlets from either JSP or HTML

My JSP is the following

<table cellpadding = "10" border = "1">
<tr valign = "bottom">
<th align = "left" > Catalog No </th>
<th align = "left" > Chemical Name </th>
<th align = "left" > Unit </th>
<th align = "left" > Price </th>
<th align = "left" > Vendor </th>
<th align = "left" > Category </th>
<th align = "left" > Account No</th>
</tr>

<%
try
{
ArrayList<CartProduct> cp3 = (ArrayList<CartProduct>) session.getAttribute("cp");
for(CartProduct pp: cp3)
{
%>
<tr>
<td><%=pp.getCatNo()%></td>
<td><%=pp.getChemName()%></td>
<td><%=pp.getChemUnit()%></td>
<td><%=pp.getPrice()%></td>
<td><%=pp.getVendor()%></td>
<td><%=pp.getCategory()%></td>
<td><select name = "accno"><option value="--Select--">--Select--</option>
<%ArrayList<String> str=pp.getAccList();
for(String s:str)
{
%> <option value="<%=s%>"><%=s%></option>
<%  
 }
%>
</select></td><td>
<a href="DisplayCartServlet?catNo=<%=pp.getCatNo()%>&;accountNo=accno">Add To Cart
</a></td>
</tr>
<%
}
}
finally{
}
%>
</table>

How do I send the value of the list box to the servlet? Currently only catNo is being passed, but accountNo is null at the servlet.

Answer 1

it should be accno , it seems you are trying to retrieve param by accountNo

Also See

• how-to-avoid-java-code-in-jsp-files

Answer 2

The easiest way to accomplish what you are attempting is to post using a form.

<form method="post" action="DisplayCartServlet">
<input type="hidden" name="catNo" value="<%=pp.getCatNo()%>">
<select name = "accno"><option value="--Select--">--Select--</option>
<%ArrayList<String> str=pp.getAccList();
for(String s:str)
{
%> <option value="<%=s%>"><%=s%></option>
<%  
 }
%>
</select>
<input type="submit" value="Add To Cart">
</form>