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这是我的代码

索引.html：

<html>

<head>
<script language="javascript">

    var xmlHttp;
    var f=1;
    var t = "text";

    function showState()
    { 
        if (typeof XMLHttpRequest != "undefined"){
            xmlHttp= new XMLHttpRequest();
            }
            else if (window.ActiveXObject){
            xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
            }
        if (xmlHttp==null){
                alert ("Browser does not support XMLHTTP Request");
            return
        } 
        var url="additem.jsp";
        xmlHttp.onreadystatechange = stateChange;

        xmlHttp.open("GET", url, true);
        xmlHttp.send(null);
    }

    function stateChange(){   
        if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){  
            document.getElementById(t).innerHTML=xmlHttp.responseText;
            t = "text"+f.toString();
            f=f+1;
        }  
    }

</script></head>

<body>
<center>
<form action=AddProd1.jsp method=post>
Enter Catagory  <td><BLOCKQUOTE></BLOCKQUOTE><BLOCKQUOTE><center><input type=text name=catagory></BLOCKQUOTE></td>
</center>
<br><br>

<div id='text'></div><br>
    <input type=submit value=Submit>
</form>
<input type=submit value=new onclick="showState();">


</body></html>

additem.jsp：

<jsp:useBean id="ob" class="te.tes" scope="session" />
<%! 

    String value = "";
    String t = "" ;
    String v="";
 %>

<%  
    v=ob.Increase();
    value = "product" + v;  
    t = "text" + v;
%>
<html>
<input type=text name=product value="<%=value%>">
<div id='<%=t%>'></div><br>
</html>

AddProd1.jsp：

<%  int i;
    String [] value = request.getParameterValues("product")
    for(i=0;i<value.length;i++)
        out.println(value[i]);

%>

无论我尝试什么，我都在 AddProd1.jsp 中的“value.length”中遇到异常......我什至试图通过只输入 request.getParameter("product") 来获得一个值......但我得到空值返回....我在做什么错？？？提前感谢..

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