无法使用$ request.getAttribute（“attributeName”）检索过滤器中的属性集

Question

  

我们实现了一些servlet，JSP和过滤器，一切都是   到目前为止工作正常。我不想跟踪下一个2-3的一个requestURL   请求，我不能在会话中保存这个，因为我们正在使用session   登录目的。但是当我们尝试在请求中设置属性时   对象并从JSP中读取它，我们总是得到空值。

     

在过滤器类中，我们执行以下操作：

    String url = ((HttpServletRequest)req).getRequestURL().toString();
    if(url.contains("asc/ascHome")){ 
    HttpServletRequest request         = (HttpServletRequest) req;
    request.setAttribute("OriginURL", "AscHome");
    }
        chain.doFilter(request, response);

> In our login.jsp, we are using the following code to retrieve the
> attribute:

    String originURL = request.getAttribute("OriginURL").toString();

> Is there anything we're missing?
> 
> Filter is as below,

public class SessionAlertFilter  implements Filter {  
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain filterChain) 
            throws IOException, ServletException {

    HttpServletResponse httpResp = (HttpServletResponse) resp;           
    HttpServletRequest httpReq = (HttpServletRequest) req;      
    HttpSession session = httpReq.getSession();
    String str_session_id = session.getId();
    //System.out.println(" session.getMaxInactiveInterval() :"+session.getMaxInactiveInterval());
    long currTime = System.currentTimeMillis();            
    //long expiryTime = currTime + (2*60 * 1000);   //25 minutes considering 30 minutes is session timeout
    long expiryTime = currTime + ((session.getMaxInactiveInterval() * 1000) - (5*60*1000));   
    Cookie cookie = new Cookie("serverTime", "" + currTime);            
    cookie.setPath("/");           
    httpResp.addCookie(cookie);  
    //SessionObj session_obj = (SessionObj) session.getAttribute("session_obj");

    if (str_session_id != null) { 
         //System.out.println("session id2------"+str_session_id+" expiryTime: "+expiryTime);
         //showTime(expiryTime);
         cookie = new Cookie("sessionExpiry", "" + expiryTime);           
     } else {                
        cookie = new Cookie("session id2------"+str_session_id+" sessionExpiry", "" + currTime);
        //showTime(expiryTime);
        //System.out.println("currTime: "+currTime);
    }           
    cookie.setPath("/");          
    ((HttpServletResponse) resp).addCookie(cookie); 

    String url = ((HttpServletRequest)req).getRequestURL().toString();
    System.out.println("In Filter.... URL  : "+url);
    if(url.contains("asc/AscHome.jsp")){
        req.setAttribute("OriginURL", "Register_Call");
    }

    filterChain.doFilter(req, resp);
    //checkCookie(httpReq);
}