How to get the real client ip by the request header like asp/php,etc?

I want to get the real client ip by request.getHeader("HTTP_X_FORWARDED_FOR"), who use the proxy server to access my site, the way asp/php using, however, I got nothing. Does jsp support the similar header from request, if yes, how to do?
thanks for your tips.
frederick

I want to get the real client ip by request.getHeader("HTTP_X_FORWARDED_FOR"), who use the proxy server to access my site, the way asp/php using, however, I got nothing. Does jsp support the similar header from request, if yes, how to do?
thanks for your tips.
frederick

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