this is natively implemented i think: its called "session"... The servlet may check if the session is still valid before deciding to contoinue its work?
>-----Message d'origine----- >De : A mailing list for discussion about Sun Microsystem's Java Servlet >API Technology. [mailto:[EMAIL PROTECTED]]De la part de >Adrian Janssen >Envoy� : mercredi 3 juillet 2002 16:19 >� : [EMAIL PROTECTED] >Objet : Re: how to check if client still connected? > > >Technicaly it's not really posiible as the server cannot initiate any >communication with the client - this is due to the asymmetric nature of the >HTTP protocol. > >However just because its not technally possible doesn't mean it can't be >done, it just need to be done sneakily ;p > >What you could do is have a hidden frame or iframe on your client that has >some nice javascript in it that continuously calls the server at regular >shortish (say 10 secs) intervals and hits a servet which keeps a record of >thier last hit in some application wide bean. Then before beggining this >task (and perhaps during it) you can check this bean and if thier last >update was older than 20 seconds, assume they have disconnected. > >Cheers >Adrian > >> -----Original Message----- >> From: steve martin [SMTP:[EMAIL PROTECTED]] >> Sent: 03 July 2002 03:32 >> To: [EMAIL PROTECTED] >> Subject: how to check if client still connected? >> >> Hi, >> Does anyone know how to check if the client browser >> still connected before performing a time-consuming >> task? >> >> thanks, >> s.m. >> >> __________________________________________________ >> Do You Yahoo!? >> Sign up for SBC Yahoo! Dial - First Month Free >> http://sbc.yahoo.com >> >> >__________________________________________________________________________ >> _ >> To unsubscribe, send email to [EMAIL PROTECTED] and include in the >> body >> 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 >-- > >It is the strict policy of Truworths that its e-mail facility and all >e-mail communications emanating therefrom, should be utilised for >business purposes only and should conform to high professional and >business standards. Truworths has stipulated certain regulations in >terms whereof strict guidelines relating to the use and content of >e-mail communications are laid down. The use of the Truworths e-mail >facility is not permitted for the distribution of chain letters or >offensive mail of any nature whatsoever. Truworths hereby distances >itself from and accepts no liability in respect of the unauthorised >use of its e-mail facility or the sending of e-mail communications >for other than strictly business purposes. Truworths furthermore >disclaims liability for any unauthorised instruction for which >permission was not granted. Truworths Limited accepts no liability >for any consequences arising from or as a result of reliance on this >message unless it is in respect of bona fide Truworths business for >which proper authorisation has been granted. > >Any recipient of an unacceptable communication, a chain letter or >offensive material of any nature is requested to notify the Truworths >e-mail administrator ([EMAIL PROTECTED]) immediately in order that >appropriate action can be taken against the individual concerned. > >___________________________________________________________________________ >To unsubscribe, send email to [EMAIL PROTECTED] and include in the body >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 [EMAIL PROTECTED] and include in the body 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
