Java获取用户的IP地址

    public String getIpAddress(HttpServletRequest request) {
        String ipAddress = request.getHeader("X-Forwarded-For");
        if (ipAddress != null && !"unKnown".equalsIgnoreCase(ipAddress)) {
            int index = ipAddress.indexOf(",");
            return index != -1 ? ipAddress.substring(0, index) : ipAddress;
        }
        ipAddress = request.getHeader("X-Real-IP");
        if (ipAddress != null && !"unKnown".equalsIgnoreCase(ipAddress)) {
            return ipAddress;
        }
        return request.getRemoteAddr();
    }