Is there any way to read the response headers in a filter in Tomcat 4.0.3 ?

2002-10-21 Thread ifriedri 
Hi,
I want to write a filter for Tomcat 4.0.3 which should record all the
traffic.But I cannot find any way to question the values of  the headers of
a response in my ResponseWrapper. Normal HttpServletResponse class doesn't
have any getter methods for headers. In the debugger I can see that there
is a org.apache.catalina.connector.HttpResponseFacade which implements (via
superclass) a org.apache.catalina.HttpResponse which has header getter
methods. But I cannot use that because these classes are invisible. Does
anybody know a way to provide a reading access to these headers?

thank you



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Re: Is there any way to read the response headers in a filter in Tomcat 4.0.3 ?

2002-10-21 Thread Andreas Probst 
Hi,

you could extend HttpServletResponseWrapper. You overwrite all 
methods which you are interested in, save the values and call 
the super method, so the underlying HttpServletResponse knows 
them. Additionally you write getter methods, which return the 
set values. 

Example:

public class LocalHttpServletResponseWrapper
  extends HttpServletResponseWrapper
{
  public LocalHttpServletResponseWrapper(HttpServletResponse 
res)
  {
super(res);
  }//constructor

  public void setStatus(int sc)
  {
super.setStatus(sc);
this.status = sc;
  }//setStatus

  public int getStatus()
  {
return status;
  }//getStatus

}//class

In your filter you receive a ServletResponse. Cast it to 
HttpServletResponse. Instantiate your 
LocalHttpServletResponseWrapper. Pass this new object to the 
doFilter.
Afterwards you can use your getter methods. The caller of your 
filter will have a normal ServletResponse.

Example:

  public void doFilter(
ServletRequest req,
ServletResponse res,
FilterChain chain)
throws IOException, ServletException
  {
HttpServletResponse hres = (HttpServletResponse) res;
HttpServletRequest hreq = (HttpServletRequest) req;

LocalHttpServletResponseWrapper lres 
  = new LocalHttpServletResponseWrapper(hres);

chain.doFilter(req, lres);
...
int status = lres.getStatus();
...
  }


Good luck.

Andreas


On 21 Oct 2002 at 10:31, [EMAIL PROTECTED] wrote:

 Hi,
 I want to write a filter for Tomcat 4.0.3 which should record all the
 traffic.But I cannot find any way to question the values of  the headers of
 a response in my ResponseWrapper. Normal HttpServletResponse class doesn't
 have any getter methods for headers. In the debugger I can see that there
 is a org.apache.catalina.connector.HttpResponseFacade which implements (via
 superclass) a org.apache.catalina.HttpResponse which has header getter
 methods. But I cannot use that because these classes are invisible. Does
 anybody know a way to provide a reading access to these headers?
 
 thank you
 
 
 
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Re: Is there any way to read the response headers in a filter in Tomcat 4.0.3 ?

2002-10-21 Thread Andreas Probst 
Forgot one thing. See intermixed.

On 21 Oct 2002 at 12:40, Andreas Probst wrote:

 Hi,
 
 you could extend HttpServletResponseWrapper. You overwrite all 
 methods which you are interested in, save the values and call 
 the super method, so the underlying HttpServletResponse knows 
 them. Additionally you write getter methods, which return the 
 set values. 
 
 Example:
 
 public class LocalHttpServletResponseWrapper
   extends HttpServletResponseWrapper
 {

private int status = -1; // senseless initial value

   public LocalHttpServletResponseWrapper(HttpServletResponse 
 res)
   {
 super(res);
   }//constructor
 
   public void setStatus(int sc)
   {
 super.setStatus(sc);
 this.status = sc;
   }//setStatus
 
   public int getStatus()
   {
 return status;
   }//getStatus
 
 }//class
 
 In your filter you receive a ServletResponse. Cast it to 
 HttpServletResponse. Instantiate your 
 LocalHttpServletResponseWrapper. Pass this new object to the 
 doFilter.
 Afterwards you can use your getter methods. The caller of your 
 filter will have a normal ServletResponse.
 
 Example:
 
   public void doFilter(
 ServletRequest req,
 ServletResponse res,
 FilterChain chain)
 throws IOException, ServletException
   {
 HttpServletResponse hres = (HttpServletResponse) res;
 HttpServletRequest hreq = (HttpServletRequest) req;
 
 LocalHttpServletResponseWrapper lres 
   = new LocalHttpServletResponseWrapper(hres);
 
 chain.doFilter(req, lres);
 ...
   int status = lres.getStatus();
 ...
   }
 
 
 Good luck.
 
 Andreas
 
 
 On 21 Oct 2002 at 10:31, [EMAIL PROTECTED] wrote:
 
  Hi,
  I want to write a filter for Tomcat 4.0.3 which should record all the
  traffic.But I cannot find any way to question the values of  the headers of
  a response in my ResponseWrapper. Normal HttpServletResponse class doesn't
  have any getter methods for headers. In the debugger I can see that there
  is a org.apache.catalina.connector.HttpResponseFacade which implements (via
  superclass) a org.apache.catalina.HttpResponse which has header getter
  methods. But I cannot use that because these classes are invisible. Does
  anybody know a way to provide a reading access to these headers?
  
  thank you
  
  
  
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  To unsubscribe, e-mail:   mailto:tomcat-user-unsubscribe;jakarta.apache.org
  For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
  
 
 
 
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