问个web session问题-每次session里的值都会变

Question

action代码:
public String addChaim(){

//session

//application
List<Claimvoucherdetail> lco=null;
HttpServletRequest request=ServletActionContext.getRequest();
HttpSession session=request.getSession();
if(session.getAttribute("lcos")==null){
lco=new ArrayList<Claimvoucherdetail>();
lco.add(claimvoucherdetail);
}else{
lco=(List<Claimvoucherdetail>)session.getAttribute("lcos");
lco.add(claimvoucherdetail);
}
session.setAttribute("lcos", lco);
lco=(List<Claimvoucherdetail>)session.getAttribute("lcos");

return SUCCESS;
}
jsp代码：
<s:iterator id="claimvoucherdetail" value="#session.lcos">
<tr>
<td>
<s:property value="claimvoucherdetail.cvditem"/>
<s:property value="claimvoucherdetail.cvdaccount"/>
<s:property value="claimvoucherdetail.cvddes"/>
</td>
</tr>
</s:iterator>
当代码运行到lco=(List<Claimvoucherdetail>)session.getAttribute("lcos");
这时loc是null,
而运行到lco.add(claimvoucherdetail);
这时loc长度是N个而且所有值都变成一样的

Answer 1

public String addChaim(){
    List<Claimvoucherdetail> lco=null;
    HttpServletRequest request=ServletActionContext.getRequest();
    HttpSession session=request.getSession();
    if(session.getAttribute("lcos")==null){
        lco=new ArrayList<Claimvoucherdetail>();
        lco.add(claimvoucherdetail);
    }else{
        lco=(List<Claimvoucherdetail>)session.getAttribute("lcos");
        lco.add(claimvoucherdetail);
    }
    session.setAttribute("lcos", lco);
    lco=(List<Claimvoucherdetail>)session.getAttribute("lcos");
    return SUCCESS;
}
jsp代码：
<s:iterator id="claimvoucherdetail" value="#session.lcos">
    <tr>
        <td>
            <s:property value="claimvoucherdetail.cvditem"/>
            <s:property value="claimvoucherdetail.cvdaccount"/>
            <s:property value="claimvoucherdetail.cvddes"/>
        </td>
    </tr>
</s:iterator>
整理下代码方便查看

Answer 2

你好，请问一下claimvoucherdetail
是什么东西；

Answer 3

Quote: 引用 2 楼 hub001a 的回复:

public String addChaim(){
    List<Claimvoucherdetail> lco=null;
    HttpServletRequest request=ServletActionContext.getRequest();
  
一个实体对象名称