无法访问应用程序引擎开发服务器上的servlet过滤器中的会话数据 [英] Unable to access session data in servlet filter on app engine dev server

问题描述

我正在尝试编写会话筛选器，以将授权检查集中到我的应用程序引擎Web应用程序中。

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）请求; 
 HttpServletResponse httpResp =（HttpServletResponse）请求; 
 HttpSession session = httpReq.getSession（）; 
 
 httpReq.setCharacterEncoding（UTF-8）; 
 httpResp.setCharacterEncoding（UTF-8）; 
 httpResp.setContentType（application / json）; 
 
布尔isAuthorized =（布尔）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I 'm遇到了这个异常：org.mortbay.jetty.request无法转换为javax.servlet.http.httpservletresponse。我在做什么错了？

解决方案

您正在尝试将request对象转换为响应。 b

变化如下

  HttpServletResponse httpResp =（HttpServletResponse）响应; 
  

I was trying to write a session filter to centralize authorization check in my app engine web app.

My filter looks like this :

@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);
    }
}

But when I'm launching app engine dev server I'm greeted with this exception : "org.mortbay.jetty.request cannot be cast to javax.servlet.http.httpservletresponse". What am I doing wrong?

解决方案

You are trying to cast "request" object as response.

change as follows

HttpServletResponse httpResp = (HttpServletResponse) response;

这篇关于无法访问应用程序引擎开发服务器上的servlet过滤器中的会话数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！