Java：使用servlet刷新我的jsp

Question

我正在我的jsp页面上工作，我有一个带有2个参数的链接：shop.jsp：

<a href="<c:url value="/boutique?achat=${module.id}&token=${module.token}" />" class=" modal-action modal-close waves-effect waves-green btn-flat">Oui</a>

所以我有2个，如果在我的servlet中，要处理两个参数：shop.java：

public void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException
{
    httpServletRequest.setAttribute("page", "boutique");
    HttpSession session = httpServletRequest.getSession(true);
    int tokens = moduleDAO.getTokens(session.getAttribute("sessionPlayer"));
    List<Module> modules = moduleDAO.select();
    httpServletRequest.setAttribute("modules", modules);
    httpServletRequest.setAttribute("tokens", tokens);

    if(httpServletRequest.getParameter("achat") != null)
    {
        inventoryDAO.addInventory(session.getAttribute("sessionPlayer"), Integer.parseInt(httpServletRequest.getParameter("achat")));
    }

    if(httpServletRequest.getParameter("token") != null)
    {
        inventoryDAO.changeToken(session.getAttribute("sessionPlayer"), Integer.parseInt(httpServletRequest.getParameter("token"))); 
    }

    getServletContext().getRequestDispatcher("/WEB-INF/shop.jsp").forward(httpServletRequest, httpServletResponse);
}

但是我想用2个参数单击lick后刷新页面，因为在shop.jsp页面中，我有一个值：$ {tokens}，它不会刷新，因为当我单击链接时，我仍然用2个参数发送。

那么，单击链接后如何刷新页面？

谢谢！

我做了：

if(httpServletRequest.getParameter("token") != null)
{
    inventoryDAO.changeToken(session.getAttribute("sessionPlayer"), Integer.parseInt(httpServletRequest.getParameter("token"))); 
    String referer = httpServletResponse.getHeader("/WEB-INF/boutique.jsp");
    httpServletResponse.sendRedirect(referer);
}

getServletContext().getRequestDispatcher("/WEB-INF/shop.jsp").forward(httpServletRequest, httpServletResponse);

但是我得到一个错误：响应得到后不能继续使用

Answer 1

我在stackoverflow上发现了另一个问题，并添加了一个return ;：

if(httpServletRequest.getParameter("token") != null) {
inventoryDAO.changeToken(session.getAttribute("sessionPlayer"), Integer.parseInt(httpServletRequest.getParameter("token")));
httpServletResponse.sendRedirect("/galactium/boutique");
return;
}