获取ip的工具类

import lombok.extern.slf4j.Slf4j;import org.apache.commons.lang3.StringUtils;import javax.servlet.http.HttpServletRequest;import java.net.InetAddress;import java.net.UnknownHostException;import java.util.regex.Matcher;import java.util.regex.Pattern;@Slf4jpublic class IpUtil {    public final static String ERROR_IP = "127.0.0.1";    public final static Pattern pattern = Pattern.            compile("(2[5][0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})");    /**     * 取外网IP     *     * @param request     * @return     */    public static String getRemoteIp(HttpServletRequest request) {        String ip = request.getHeader("x-real-ip");        if (ip == null) {            ip = request.getRemoteAddr();        }        //过滤反向代理的ip        String[] stemps = ip.split(",");        if (stemps != null && stemps.length >= 1) {            //得到第一个IP，即客户端真实IP            ip = stemps[0];        }        ip = ip.trim();        if (ip.length() > 23) {            ip = ip.substring(0, 23);        }        return ip;    }    /**     * 获取用户的真实ip     *     * @param request     * @return     */    public static String getUserIP(HttpServletRequest request) {        // 优先取X-Real-IP        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();            if ("0:0:0:0:0:0:0:1".equals(ip)) {                ip = ERROR_IP;            }        }        if ("unknown".equalsIgnoreCase(ip)) {            ip = ERROR_IP;            return ip;        }        int pos = ip.indexOf(',');        if (pos >= 0) {            ip = ip.substring(0, pos);        }        return ip;    }    public static String getLastIpSegment(HttpServletRequest request) {        String ip = getUserIP(request);        if (ip != null) {            ip = ip.substring(ip.lastIndexOf('.') + 1);        } else {            ip = "0";        }        return ip;    }    public static boolean isValidIP(HttpServletRequest request) {        String ip = getUserIP(request);        return isValidIP(ip);    }    /**     * 判断我们获取的ip是否是一个符合规则ip     *     * @param ip     * @return     */    public static boolean isValidIP(String ip) {        if (StringUtils.isEmpty(ip)) {            log.debug("ip is null. valid result is false");            return false;        }        Matcher matcher = pattern.matcher(ip);        boolean isValid = matcher.matches();        log.debug("valid ip:" + ip + " result is: " + isValid);        return isValid;    }    public static String getLastServerIpSegment() {        String ip = getServerIP();        if (ip != null) {            ip = ip.substring(ip.lastIndexOf('.') + 1);        } else {            ip = "0";        }        return ip;    }    public static String getServerIP() {        InetAddress inet;        try {            inet = InetAddress.getLocalHost();            String hostAddress = inet.getHostAddress();            return hostAddress;        } catch (UnknownHostException e) {            e.printStackTrace();        }        return "127.0.0.1";    }}