package com.suyun.vehicle.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 常用獲取客戶端資訊的工具
 */
public final class NetworkUtil {
    private static Logger LOGGER = LoggerFactory.getLogger(NetworkUtil.class);
    public static String IP = "";

    static {
        try {
            Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
            while (netInterfaces.hasMoreElements()) {
                Enumeration<InetAddress> ni = ((NetworkInterface) netInterfaces.nextElement()).getInetAddresses();
                if (ni.hasMoreElements()) {
                    IP = ni.nextElement().getHostAddress();
                    if (!"127.0.0.1".equals(IP) && IP.indexOf(":") == -1 && isIP(IP)) {
                        LOGGER.info("當前機器受用的IP是"+IP);
                        break;
                    }
                }
            }
        } catch (SocketException e) {
            LOGGER.error("獲取當前伺服器IP失敗" + e);
        }
    }


    public static boolean isIP(String addr) {
        if (addr.length() < 7 || addr.length() > 15 || "".equals(addr)) {
            return false;
        }
        /**
         * 判斷IP格式和範圍
         */
        String rexp = "([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}";

        Pattern pat = Pattern.compile(rexp);

        Matcher mat = pat.matcher(addr);

        boolean ipAddress = mat.find();

        return ipAddress;
    }

    public static void main(String[] args) {
        System.out.println(NetworkUtil.IP);
    }
}