spring mvc 获取nginx下用户真实ip

如果经过多台服务器Nginx转发，获取的ip内容类似这样218.5.70.170, 192.168.1.1，所以过滤掉空格取第1个就是。

private String getRemortIP(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        ip = ip.replace(" ", "").trim();
        if (StringUtils.isNotBlank(ip)) {
            String[] ips = ip.split(",");
            ip = ips[0];
        }
        logService.log(request.getRequestURL().toString(), request.getMethod(), ip, 0);
        return ip;
    }