java - 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 same ip? thanks

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UPDATE: request.getRemoteAddr() and request.getRemoteHost() return the Server names, not the client's host name and ip. Anyone else got any bright ideas?

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Ok, so lets forget about the voting twice thing. Im just trying to get the users ip address? i tried request.getRemoteAddr() and request.getRemoteHost() and think im getting the servers address. I have access to two separate networks and am getting the same IP address :(

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().