Nginx获取真实IP

通过Nginx作为前端服务器转发后，获取到的并不是真实的IP，需要通过下面一段才能获得真实的IP

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

 然后Java中就可以通过X-Real-IP头来获取真实的IP了

public String getRealIp(HttpServletRequest request) {
		String ip = request.getHeader("X-Real-IP");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("x-forwarded-for");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}