从request获取远程IP

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public static String getIpAddr(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.getHeader("HTTP_CLIENT_IP");           }           if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {               ip = request.getHeader("HTTP_X_FORWARDED_FOR");           }           if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {               ip = request.getRemoteAddr();           }             return ip;       }