wap编程中如何用jsp获得Http_User_Agent？

Question

LogWrite.WriteLog("*************查看头信息-start************");
      Enumeration typestr=request.getHeaderNames();
      while(typestr.hasMoreElements())
      { 
        LogWrite.WriteLog("---------------------------------");
        LogWrite.WriteLog(dataTypes.NullToStr(typestr.nextElement()));
        LogWrite.WriteLog(request.getHeader(dataTypes.NullToStr(typestr.nextElement())));
        LogWrite.WriteLog("---------------------------------");
      }           
      LogWrite.WriteLog("*************查看头信息-end************");