jsp get ip address

Question

whats the best way of preventing someone from voting twice? How do i get the users ip address? What if they are on a large network? will everyone on that network show the sa

Answer 1

In your JSP, use request.getRemoteAddr(). This returns the IP address of the agent that sent the request as a String.

Also, request.getRemoteHost() will attempt to get the fully qualified host name. If it can't resolve the name however, the IP address will be returned as in getRemoteAddr().