java get ip address

wrote

proxy_set_header X-Real-IP $remote_addr;
request.getHeader("X-Real-IP")

 

public String getUserIp(HttpServletRequest request){
	String ip=request.getHeader("X-Real-IP-A");
	if(ip==null)
		ip=request.getHeader("X-Real-IP");
	if(ip==null)//If the request is not through a proxy server, this ip will be empty
		ip=request.getRemoteAddr();
	return ip;
}