Java 无法访问应用引擎开发服务器上servlet筛选器中的会话数据

我正试图编写一个会话过滤器来集中我的应用程序引擎web应用程序中的授权检查

我的过滤器如下所示：

@Override
public void doFilter(ServletRequest request, ServletResponse response,
        FilterChain chain) throws IOException, ServletException {
    HttpServletRequest httpReq = (HttpServletRequest) request;
    HttpServletResponse httpResp = (HttpServletResponse) request;
    HttpSession session = httpReq.getSession();

    httpReq.setCharacterEncoding("UTF-8");
    httpResp.setCharacterEncoding("UTF-8");
    httpResp.setContentType("application/json");

    Boolean isAuthorized = (Boolean) session.getAttribute("isAuthorized");

    if (!isAuthorized || isAuthorized == null) {
        httpResp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
    } else {
        chain.doFilter(request, response);
    }
}

但当我启动AppEngine开发服务器时，我遇到了一个例外：“org.mortbay.jetty.request不能转换为javax.servlet.http.httpservletresponse”。我做错了什么？

您试图将“请求”对象转换为响应

更改如下

HttpServletResponse httpResp = (HttpServletResponse) response;

---

HttpServletResponse httpResp=（HttpServletResponse）请求

；再读一遍这句话。