传播我的jstl标签的一段代码 <forEach> 在jsp页面上：

<select>    
    <c:if test="${!empty codeofcountries}">
      <c:forEach var="codecoun" items="${codeofcountries}">
            <option value="${codecoun.kods}">${codecoun}</option>
      </c:forEach>
  </c:if>
</select>

我的控制器：

public void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException {
        response.setContentType(request.getResponseContentType());
        PPUZ_NDI_MNS_ENEEPortletSessionBean sessionBean = getSessionBean(request);
        if( sessionBean==null ) {
            response.getWriter().println("<b>NO PORTLET SESSION YET</b>");
            return;
        }
        sessionBean.setDefaultInfoText();

        String jsp = Start_JSP;
        switch (sessionBean.getMode()) {
            case Start:
                jsp = Start_JSP;
                break;
            case Main:
                jsp = Main_JSP;
                break;
            case Creat:
            case Edit:
            case Copy:
                jsp = CreatEdit_JSP;
        }
        request.setAttribute("codeofcountries", sessionBean.getKodNameList());
        PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher(getJspFilePath(request, jsp));
        rd.include(request, response);

当我转到portlet all handled well时，列表是从数组生成的，并显示在标记中 <select> 如我所需。但是当我在门户上重新运行会话时，标签（select）的值在jsp页面上被复制。不要将上一个值保留在tag（select）中，并再次向其添加相同的列表。