In JSP page I want to get IP address of user who view the page. How?

Question

In JSP page I want to get IP address of user who view the page. How can ?

Answer 1

<%= request.getRemoteAddr() %>

Returns the Internet Protocol (IP) address of the client or last proxy that sent the request. For HTTP servlets, same as the value of the CGI variable REMOTE_ADDR.

Answer 2

Just to add to @Lauri's answer.

If the request came via a proxy, there should be a "Via" header in the request.

However, there is no way to figure out what the real client IP address if there are any intermediate proxies. And a lot of peoples' browsers use proxies, whether or not they are aware of it.

Answer 3

Since scriptlets (those <% %> things) are discouraged since a decade, here's the EL solution:

<p>Your IP address is: ${pageContext.request.remoteAddr}</p>

If you actually intend to use this for some business purposes rather than displaying purposes, then you should be using a servlet. It's then available by HttpServletRequest#getRemoteAddr().