Gang Zhang,您好！

  the fact is that the servlet is working right! I want to add some new function, but I want not to modify the servlet, and to use filter to control the servlet. When a method in servlet method succeful,the filter do something ,or the filter do nothing.

 Thank you very much for you had answered my many questions!

======= 2004-01-08 22:08:00 您在来信中写道：=======

>Do you want to write debug messages? you can either
>print to standard out or print to browser screen with
>the response (for testing). Or you can log to file for
>checking
>
>Gang
>
>groundsea wrote:
>
>>Bob Withers,您好！
>>
>>     I mean how the filter control the method when the method is succeful, which do not throw Exception.
>>
>>======= 2004-01-08 05:55:00 您在来信中写道：=======
>>
>>
>>
>>>When the final filter in a chain calls doFilter() the service method of the
>>>servlet is called. If the servlet throws an exception it can be caught and
>>>acted upon by a filter if you wish.
>>>
>>>try
>>>{
>>>   doFilter(req, resp, chain);
>>>}
>>>catch (Exception e)
>>>{
>>>   // the servlet failed
>>>}
>>>
>>>Regards,
>>>Bob
>>>
>>>At 02:18 PM 1/8/2004 +0800, you wrote:
>>>
>>>
>>>>SERVLET-INTEREST！
>>>>
>>>>       when a method of a servlet is successful, its filter begin to
>>>>do something, or the filter not do anything.
>>>>   I want to know, in filter how to know whether that method is successful?
>>>>
>>>>　　　　　　　　致
>>>>礼！
>>>>
>>>>
>>>>　　　　　　　　groundsea
>>>>　　　　　　　　sunyh@(protected)
>>>>　　　　　　　　　　2004-01-08
>>>>
>>>>___________________________________________________________________________
>>>>To unsubscribe, send email to listserv@(protected)
>>>>of the message "signoff SERVLET-INTEREST".
>>>>
>>>>Archives: http://archives.java.sun.com/archives/servlet-interest.html
>>>>Resources: http://java.sun.com/products/servlet/external-resources.html
>>>>LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
>>>>
>>>>
>>>___________________________________________________________________________
>>>To unsubscribe, send email to listserv@(protected)
>>>of the message "signoff SERVLET-INTEREST".
>>>
>>>Archives: http://archives.java.sun.com/archives/servlet-interest.html
>>>Resources: http://java.sun.com/products/servlet/external-resources.html
>>>LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
>>>
>>>
>>
>>= = = = = = = = = = = = = = = = = = = =
>>
>>
>>　　　　　　　　致
>>礼！
>>
>>
>>　　　　　　　　groundsea
>>　　　　　　　　sunyh@(protected)
>>　　　　　　　　　　2004-01-09
>>
>>___________________________________________________________________________
>>To unsubscribe, send email to listserv@(protected)
>>of the message "signoff SERVLET-INTEREST".
>>
>>Archives: http://archives.java.sun.com/archives/servlet-interest.html
>>Resources: http://java.sun.com/products/servlet/external-resources.html
>>LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
>>
>>
>>
>
>___________________________________________________________________________
>To unsubscribe, send email to listserv@(protected)
>of the message "signoff SERVLET-INTEREST".
>
>Archives: http://archives.java.sun.com/archives/servlet-interest.html
>Resources: http://java.sun.com/products/servlet/external-resources.html
>LISTSERV Help: http://www.lsoft.com/manuals/user/user.html

= = = = = = = = = = = = = = = = = = = =
     

　　　　　　　　致
礼！

       
　　　　　　　　groundsea
　　　　　　　　sunyh@(protected)
　　　　　　　　　　2004-01-09

___________________________________________________________________________
To unsubscribe, send email to listserv@(protected)
of the message "signoff SERVLET-INTEREST".

Archives: http://archives.java.sun.com/archives/servlet-interest.html
Resources: http://java.sun.com/products/servlet/external-resources.html
LISTSERV Help: http://www.lsoft.com/manuals/user/user.html