Servlet Filter Confusion

[Ram Chhabra]

Hi,

I have created one filter. What i want that once control come to Filter, i need to do some validations and if it passes that validation then only i need to call chain.doFilter(res, req) but if validation fails then i don't want that request goes to servlet.

Can i send response from Filter only to client, without going to specific servlet.?

Thanks

[Vishwanath Krishnamurthi]

I think you can do it this way...

public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
         throws ServletException, IOException
        {
   
              HttpServletRequest httpReq = (HttpServletRequest)req;
              HttpServletResponse httpResp = (HttpServletResponse)resp;
      
              if(errorOccured)
               {
                 
                  httpResp.sendRedirect("error.jsp");
               }
              chain.doFilter(httpReq,httpResp);    
         }

Regards,
Vishwa

[Bosun Bello]

Yes. you should be able to control if the filter should continue the response or not.

[Ram Chhabra]

Thanks for your reply. Inspite of sending to error page, is it ok to create the Response object and send back to client from filter only.

[Bear Bibeault]

I would not generate output in a filter -- that's not its intent. Rather forward or redirect to whatever resource (JSP or servlet) will gneerate the desired response.