IP地址的获取

//ip地址的获取:非原创,之前在其他地方看到,拿过来备份下:

public static String getIPAddress(HttpServletRequest request) {
        String ip = null;
        String ipAddresses = request.getHeader("X-Forwarded-For");
        if(ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ipAddresses = request.getHeader("Proxy-Client-IP");
        }

        if(ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ipAddresses = request.getHeader("WL-Proxy-Client-IP");
        }

        if(ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ipAddresses = request.getHeader("HTTP_CLIENT_IP");
        }

        if(ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ipAddresses = request.getHeader("X-Real-IP");
        }

        if(ipAddresses != null && ipAddresses.length() != 0) {
            ip = ipAddresses.split(",")[0];
        }

        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
            ip = request.getRemoteAddr();
        }

        return ip;
    }