How to get attributes from HttpServletRequest?

[Zhang zhongliang]

    I have a question about axis2.When the client send a request,and the 
protocol is http,for example,http://domain/myservice,the client has a unique id 
that stored in the database,or it provides a client certificate.I can get the 
id or certificate at my Filter.
    Now I want get the id in the web service,is there any way to pass the value 
that set in the HttpServletRequest object to the service?
    Any advice will be appreciated!