java - 无法访问 App Engine 开发服务器上的 servlet 过滤器中的 session 数据

Question

我试图编写一个 session 过滤器来集中我的应用引擎网络应用程序中的授权检查。

我的过滤器看起来像这样:

@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);
    }
}

但是当我启动应用程序引擎开发服务器时，我遇到了这个异常:“org.mortbay.jetty.request cannot be cast to javax.servlet.http.httpservletresponse”。我做错了什么？

Answer 1

您正在尝试将“请求”对象转换为响应。

修改如下

HttpServletResponse httpResp = (HttpServletResponse) response;